Heat Pump Blowing Cold Air: Step-By-Step Troubleshooting

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By Debarghya Roy

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Is your heat pump blowing cold air and making your home uncomfortable? This is a common problem that requires proper attention to ensure the most efficient operation of your system.

Heat pumps are a major contributor in providing heating during colder months, but there could be many reasons why it is producing cold air instead of warm. In this blog post, we will discuss the different causes, how to fix them and preventive maintenance tips for avoiding future issues with heat pumps.

heat pump blowing cold air

Image of a heat pump in a residential site

Key Takeaways

  • Incorrect thermostat settings can cause a heat pump to blow cool air instead of warm air.
  • Low refrigerant levels, dirty air filters, faulty valves and compressors, improper thermostat settings, and a faulty reversing valve are common causes of heat pumps blowing cold air.
  • Homeowners should regularly check their filters and replace them as necessary (usually every 1 – 3 months). This helps prevent clogged or blocked airflow issues that can lead to chilly temperatures in the interior.
  • It’s also important for homeowners to ensure their thermostats are set on “heat” with an appropriate temperature setting (generally around 68°F) for optimized efficiency during winter months, regular inspections from professionals will help keep all components running smoothly & efficiently throughout the year.

Why Is Your Heat Pump Blowing Cold Air?

There are several common reasons why a heat pump may be blowing cold air, including low refrigerant levels, dirty air filters, faulty valves and compressors, improper thermostat settings, and a faulty reversing valve.

Low Refrigerant Levels

Low refrigerant levels can cause a heat pump to blow cool air instead of warm air, preventing it from fulfilling its duty of warming your home during the winter. 

Since a heat pump relies on an adequate level of refrigerant to extract enough warmth from outdoor air and transfer it into your indoor environment, if that amount is too low due to leakage or other factors, as much as 80% or more of the system’s efficiency can be lost resulting in a cold airflow out of the vents.

It’s important to note that attempting to repair and refill any R-22 refrigerant leaks without first having your system professionally inspected could drastically damage components such as compressors by introducing also introducing moisture directly into the lines through condensation.

Dirty Air Filters

A central problem that can cause heat pumps to blow cold air during the winter is a dirty or clogged air filter. If dirt, dust, and other impurities accumulate in the filter for too long they can block airflow, causing problems with your system’s performance.

This is especially true during extreme weather conditions when your HVAC unit may be working overtime to maintain temperature levels. 

A clogged filter means less warm air getting into the interior of your home, resulting in chilly temperatures and an unbalanced environment.

The impact of a plugged air filter doesn’t stop there, it can also force unfiltered incoming air into the heat pump system which causes dirt, grime, and other contaminants to settle on parts like coils and dampers.

These pollutants are resistant even with modern filtration systems so over time will start to reduce efficient heating & cooling operation while increasing energy bills.

Cleaning these components manually is often laborious so replacing faulty filters should help restore equilibrium in most cases.

Faulty Compressor Or Valves

A faulty compressor or valves can be serious issues when it comes to a heat pump blowing cold air. When the compressor contactor is broken, the system will run constantly resulting in cold air being blown out and an increase in energy usage.

Malfunctioning valves can also prevent warm air from flowing into your home if they’re stuck in one mode such as cooling instead of switching between heating and cooling correctly.

It’s important for professionals to diagnose these issues quickly so that further damage isn’t done to the heat pump. 

An effective way to do this is by questioning the homeowner about what they have observed and conducting a detailed inspection of both indoor and outdoor components of the system including refrigerant lines, coils, valves, compressors, clogged filters etc., as well as electrical components like wiring harnesses which could reveal consistent cycling or lack thereof which can indicate problems beyond just low coolant levels.

Improper Thermostat Settings

One issue that can cause the heat pump to blow cold air is a setting of the thermostat being too low for heating mode. If the thermostat settings are incorrect, it may trigger the system to enter cooling mode instead of heating, thereby leaving you with cool air blowing out.

It is important to make sure your thermostat is set on “heat” and matches with an appropriate temperature, generally around 68°F for optimal efficiency during winter months.

To start off troubleshooting this problem yourself, take care to adjust your heat pump’s settings accordingly by setting it to “heat” and selecting your desired temperature correctly according to what weather outside demands.

Not addressing this simple fix can be problematic not only in terms of comfortability but also financially as continuing improper thermostat settings will lead energy bills increasing due to wasted energy from inefficient usage of heat pumps

Faulty Reversing Valve

A faulty reversing valve can be one of the main causes of a heat pump blowing cold air. The reversing valve is an important component in a heat pump, as it allows for the switching between heating and cooling modes.

When functioning correctly, the valve will enable the system to switch seamlessly between heating and cooling depending on what it is set to do.

This issue can cause significant problems since having a non-functioning valve stops the smooth operation of your unit by refusing to mix refrigerant gas with air during reverse cycle phase, resulting in cool air coming out even though its meant for heating purposes only.

Common Causes Of Heat Pump Blowing Cold Air

  • Power outages, 
  • Incorrect settings, 
  • Defrost cycle, 
  • Dirty coils 
  • An oversized or undersized unit.

Power Outages

Power outages can have a damaging effect on the operation of heat pumps, resulting in it blowing cold air. When a power outage occurs, the electric circuit breakers are cut off and this disruption causes certain components of the heat pump to not function properly or cease operating together entirely.

The thermostat is one of these components for example; when it shuts down due to lack of electricity, other systems such as the compressor won’t receive the signal they need and start operating which disrupts the overall efficiency of your unit.

This could result in lower temperatures or no temperature at all being delivered indoors despite setting up your desired temperature levels on your thermostat settings.

It can also cause problems with motor circuits that prevent proper heating from happening even when adequate electricity is restored.

Fortunately, many steps can be taken to protect against power outages affecting our heat pumps that involve preventive maintenance provided by an accredited professional contractor service experienced with this type of equipment repair and replacement services.

Incorrect Settings

One of the main causes of a heat pump blowing cold air is incorrect settings on the thermostat. If the ‘mode’ setting on your thermostat is set to cool rather than heat, this will cause your heat pump to blow cold air instead of warm air.

It’s important that you make sure that this setting is always properly adjusted for optimal heating efficiency and temperature in both winter and summer. 

Additionally, it’s also possible for a faulty fan or relays switch (which control whether or not the fan runs when cooling) can malfunction and result in your heat pump not blowing warm enough air while still running correctly, so check these too. 

Avoiding damage caused by incorrect settings requires regularly checking your thermostat’s display to ensure all settings are correct, as well as getting an annual maintenance service performed which can diagnose any other problems with temperatures being maintained throughout your home.

Defrost Cycle

The defrost cycle in heat pumps is an important part of keeping the outdoor coils from freezing up. It occurs when a temperature sensor indicates that there has been a buildup of ice and frost on the outdoor unit’s evaporator coil.

This usually happens when temperatures are consistently below 40 degrees Fahrenheit. When this happens, the thermostat sends a signal to kick off the defrosting process which can take anywhere from 30 minutes to two hours and engages in cooling mode while it goes through the process.

During this time, hot gas refrigerant flows into coils just above the fan motor outside and warms them up enough to melt any ice or frost on those coils. The fan then blows warm air over them for 15-20 minutes to speed up melting before returning to “heat” mode again and heating your home properly.

Common problems with poor airflow during defrost include clogged filters or leaking ductwork which cause cold air flow into ventilation systems instead of being blocked off as it should be during defrost cycle times.

Dirty Coils

Dirty coils are a common issue that can lead to your heat pump blowing cold air. When the set of outdoor and indoor evaporator coils become clogged with dirt, dust, debris or even microorganisms, it restricts the airflow going through the unit and makes it harder for the system to transfer heat from outside air into the home.

The decreased effectiveness in turning hot air into cool air causes strain on its other components, leading to a drop in efficiency and eventually resulting in a heat pump blowing cold air during winter months.

It is therefore essential to regularly inspect and maintain all parts of the system, especially checking for dirty coils, as this will help keep your heating bills down while keeping you comfortable all year round.

Oversized Or Undersized Unit

When it comes to heat pumps, an oversized or undersized unit can cause issues relating to comfort level and system efficiency. An incorrectly sized unit can use too much energy, resulting in higher electricity bills.

Additionally, the unit may not be able to cool or heat your home adequately since it is not properly calibrated for the space. An over-sized heat pump will often turn on and off frequently; this frequent cycling severely reduces the lifespan of the appliance as immobilization causes strain on its components.

Conversely, a size that is too small will work hard all day and raises your monthly expenses without providing enough cooling capabilities when you need them most.

How To Fix A Heat Pump Blowing Cold Air

Check Thermostat Settings

-Clean Air Filters

-Inspect Outdoor Unit

-Check Refrigerant Levels

-Check for Duct Leakage

Check Thermostat Settings

To check the thermostat settings on a heat pump, begin by ensuring that the temperature is set to what is desired. 

The fan setting should be “AUTO” instead of “ON” which will prevent continuous running or from blowing cold air when not in use. If the settings are correct but there’s no warm air coming out, then it might indicate an issue with the compressor or outdoor unit which would require further troubleshooting. 

Another possible cause could be electrical issues such as loss of power supply to your thermostat preventing the heat pump from getting any information regarding your desired temperature reading.

It is also important to note if you have a defective thermostat or air handler installed in order for repairs to take place where necessary and prevent instances of heat pumps blowing cold air due its lack of working components.

Clean Air Filters

Clean air filters are an important part of maintaining a heat pump system. When dirt, dust, and other contaminants build up in the filter it restricts airflow into the heat pump’s compressor coil; this makes it harder for the unit to move air through its system efficiently. 

Dirty or clogged filters can also contribute to ice accumulation on outdoor compressors during winter months reducing their effectiveness and increasing wear-and-tear. It is therefore important to regularly check your air filters and clean or replace them as necessary in every two to four weeks (or more often if they appear dirty).

Failing to do so may result in insufficient heating, longer run times between cycles of operation which increase energy use, and even damage caused by excessive strain on these parts. 

Additionally, new research suggests that dirty HVAC systems may be linked with allergies since they act as “breeding grounds” for microorganisms such as fungus spores and pollen. Thus regular cleaning or replacing your air filter not only keeps a healthy functioning system but can also improve the health of those living in your home!

Inspect Outdoor Unit

Inspecting the outdoor unit of a heat pump is essential for ensuring its proper functioning and preventing future costly repairs. 

The fan, coil, refrigerant lines and compressor are all key components that should be regularly inspected to reduce potential problems over time. 

Regular inspection of the outdoor unit will also identify any inefficient cooling or heating caused by dirt build-up on the fan blades or coils.

  1. Fan: Make sure that the blades of the fan are clear from dirt and debris, as this can disrupt airflow leading to excessively cold air being passed through your home in winter months. Additionally, inspect that all motor connections are secure and no wiring has become weakened over time.
  2. Coil: Dirty or frozen condenser coils can impact efficiency levels drastically. Therefore it is important to clean both inside & outside units when needed for adequate performance. If too much buildup accumulates around these coils then there could be serious overheating issues arising from not enough capacity being generated with every cycle period resulting in cooler temperatures entering your home than normal during colder weather timeslots.
  3. Refrigerant Lines: A faulty system always affects efficiency directly. Leakages due to weak hydraulic lines have been traced back numerous times causing wrong temperature control settings which affect output negatively overall. Check that all line joints are tightly sealed together with strong clamps so they don’t come loose & start leaking onto other parts creating malfunctions such as poor heat dispersion.
  4. Compressor: An incorrectly performing compressor usually leads towards inefficient running operations too. Check lubrication oil levels on compressors & note any undue noise when they’re running. Examine phase volts between capacitors because slight changes here can lead towards warmer conditions emanating instead of cool. Other internal machinery inside must remain consistent & free moving at all times otherwise faults develop enhancing further resulting complications down track.

Check Refrigerant Levels

A low refrigerant level in a heat pump is one of the leading causes of cold air flow. The purpose of refrigerant is to circulate and absorb energy from the outside air or ground, cooling it down before releasing it into your home. When the unit’s refrigerant charge drops below the manufacturers recommendation, it cannot absorb enough thermal energy needed for adequate heating and cooling results. This then leads to inadequate temperatures and inefficient operation overall.

Causes of low Refrigerant can include:

  • Leaks in Refrigerant lines
  • Poorly installed line sets by an inexperienced technician
  • Not taking appropriate measures when dealing with temperature fluctuations due to changing climates
  • Faulty reversing valve

In order to properly diagnose if a low refrigerant level is causing your heat pump issues, rigorous safety checks should be made before attempting any repair work as short circuits are dangerous not only for you but also those around you as they may prove fatal. 

This task requires professional involvement as there may be other possible causes such as worn out compressor valves or failing components that have been missed during installation which require specialist attention.

Check For Duct Leakage

One of the most common causes of a heat pump blowing cold air is duct leakage. Ducts are responsible to move air from place to place, so when they leak, the amount of airflow that enters and leaves the system can be reduced, affecting its performance. 

Inspecting your ductwork regularly for any sign of leaks is essential in ensuring efficient operation. Leaking vents can waste energy as hot or cool air escapes before it reaches its destination, leading to increased utility costs

Even small holes in your ventilation system may lead a substantial loss of conditioned air over extended periods. This does not only make your unit work harder but also may cause pressure differential inside you home resulting on dryers running slower while increasing humidity levels indoors as well as making doors hard to close due different pressures existing between outdoor and indoor environments respectively.

When To Call A Professional

It is important to seek the help of a professional if troubleshooting tips do not work, if there are electrical issues with the heat pump, or if repair or replacement is needed.

If Previous Troubleshooting Tips Do Not Work

If previous troubleshooting steps, such as checking the thermostat and fan control settings or cleaning air filters, have not resolved your issue with a heat pump blowing cold air then it is best to call an HVAC professional for help.

While trying to fix a malfunctioning heat pump without sufficient expertise may be tempting, attempting this can often lead to further damage and costlier repairs. 

An experienced HVAC technician will be able to diagnose the exact cause of your problem quickly and confidently provide you with an appropriate solution in as little time as possible.

A Carrier warning cites three common sources of malfunctioning heat pumps related to compressor issues, blown blower motor faults, or defective fan motors. These types of problems require someone trained in diagnostics and repairs in order to ensure that no further damage takes place during repair work.

Furthermore, seeking professional help on major heating system issues improves energy efficiency while also ensuring safety concerns are avoided during installation procedures.

If There Are Electrical Issues

Electrical issues can be a major cause of heat pump blowing cold air. These issues may occur due to damaged wiring, loose terminals, or blown blower motor and fan motor components in the HVAC system.

Significantly lower indoor temperatures as compared to outdoor temperature could also indicate electrical problems with your heat pump unit. In such cases, hiring a qualified HVAC technician is essential for diagnosing and repairing the root cause behind the issue.

If The Heat Pump Needs Repair Or Replacement

It is important to recognize when a heat pump needs repair or replacement in order to ensure the system is functioning efficiently and safely. Homeowners may notice that their heat pump isn’t producing hot air as expected, such as if it takes longer than usual for the house to heat up.

Other common signs of an issue with a heat pump are inconsistent heating/cooling temperatures, strange noises coming from the unit, reduced airflow or output power, and less energy efficiency than before.

If any of these symptoms begin appearing frequently around your property then it could be an indication that your system requires some attention from professional technicians who can identify the source of the problem and take steps to return it back into working order.

If The Reversing Valve Needs To Be Changed

The reversal valve makes sure that the intake of warm air or ejection of cold air happens as per the temperature settings on the thermostat. If this valve malfunctions, then hot/cold airflow can be disrupted leading to an uncomfortable indoor temperature and sometimes even complete failure of the system.

Diagnosing whether there is indeed an issue with the reversing valve relates more accurately to professional HVAC technicians only. 

Factors such as low levels of refrigerant, leakage through faulty coils, overheating due to continuous operation etc, deter proper functioning, all need adept inspection by qualified personnel before any decision-making process about repairs can begin.

Preventive Maintenance To Avoid Heat Pump Issues

Regular maintenance is key to avoiding heat pump issues, including the frustration of your unit blowing cold air. Implementing regular maintenance checks and servicing will help ensure that any current or potential future issues are caught early and dealt with promptly.

Schedule Regular Maintenance Visits

Regular maintenance visits are one of the most important steps in preventing heat pumps from blowing cold air or experiencing other problems. 

Maintenance visits should be scheduled at least twice a year with an HVAC technician to ensure that all aspects of the system are checked over and functioning correctly. 

During these visits, technicians can check for any loose connections, low refrigerant levels, dirty filters, damaged components, electrical malfunctions and clogged coils among other issues.

Benefits of Regular Maintenance Visits:

  1. Extend the life of your unit by ensuring all parts remain clean and working properly
  2. Avoid costly repair bills caused by neglected units with preventative maintenance checks
  3. Reduce energy costs by ensuring optimal performance for your heating system and reduce wear and tear on the unit
  4. Maintain warranties as many require regular tune-ups to keep them valid

By scheduling regular maintenance check-ups throughout the year it will help diagnose any potential issues before they become too big resulting in an emergency situation during colder months when you may not have time to wait for a service call!

Keep Outdoor Unit Clean

When dirt, leaves or other debris accumulate on its cooling coil and condenser, it can reduce the heat pump’s efficiency by blocking air flow and reducing heat exchange. This could cause higher than average electricity bills as well as faster wear and tear of parts.

In addition, it can stop your indoor unit from running correctly since there won’t be sufficient cold air being circulated throughout your home, causing the temperature to remain warmer than desired if in cooling mode. 

The accumulation of pollutants near the outdoor fan may even lead to odors indoors when used in heating mode due to poor airflow circulation from clogged filters located inside, leading to high-energy costs while trying to reach a desired temperature setting.

Cleaning an outdoor unit is not a complex task, however some maintenance might help prevent buildup such as blowing out any existing debris with compressed gas or power washing with water below 40 PSI during cool season days only unless you’re using an approved compressor wash system that dries quickly before restarting operation after cleaning process has been completed. 

It’s also important to keep at least two feet of clearance around either side of the exterior unit including lawnmowers or flowerpots nearby which could obstruct air intake or outlets creating major issues for your HVAC system. 

Check Refrigerant Levels

Checking the refrigerant level is a critical maintenance step in order to diagnose any potential issues with a heat pump. 

Low levels of refrigerant compromise the efficiency and cooling/heating capacity of a heat pump resulting in cold air being blown out instead of warm air. 

This is typically one of the primary causes for a heat pump blowing cold air during winter months and can be avoided through routine upkeep where technicians check refigerant levels as part of regularly scheduled visits.

It is also important to note that if there is an issue related to leaks or clogs, then professional help should be sought as carbon dioxide emissions from refrigerants may cause harm. Refrigerant lines must be checked carefully and no DIY solutions should ever be attempted by anyone without proper experience and training.

Replace Filters As Needed

It is essential to replace air filters in your heat pump system on a regular basis. Dirty or clogged filters can have an adverse effect on the performance, efficiency and lifespan of your system, resulting in reduced comfort levels and higher monthly energy bills. 

Additionally, when the filter becomes blocked it forces unfiltered incoming air into the main unit leading to dust, grime and other contaminants settling onto parts inside of the system that weren’t meant to be there. It causes issues such as freezing up or blowing cold air from your vents.

The best practice for you to change out your filters every 90 days as part of regular preventive maintenance measures in order to keep everything running correctly and avoid costly repairs due to neglecting this important task.

Insulate Your Home

Proper insulation in the home plays a key role in preventing heat pump issues related to blowing cold air. Applying an adequate amount of insulation material helps resist the flow of heat and keeps heated air from escaping during winter seasons while keeping your house cool during summer months. 

Different types of materials can used for insulating homes, such as fibreglass bats, mineral wool, cellulose fibre, and spray foam improvements which offer varying levels of resistance to air movement. 

Fiberglass bats are also effective against soundproofing providing extra peace and quiet indoors. Insulation upgrades help protect various parts within the HVAC system from being overworked due to extreme temperature fluctuations between inside and outside environments leading to more efficient operation year-round. 

It is important that you choose high-quality products when opting for insulation solutions as low quality materials will lead to ineffective thermal control leading towards higher energy bills in addition to recurring heat pump issues like blowing cold air.

Common Issues With Heat Pumps And Their Solutions

By understanding the common issues of a heat pump and their solutions, homeowners can troubleshoot the problem quickly when they notice it blowing cold air.

Heat Pump Blowing Cold Air After Power Outage

IssueCause Solution
Heat pump blowing cold air after power outageTransition into defrost cycle during power restorationWait for the defrost cycle to complete as it is a normal part of the operation. Ensure the heat pump has enough time to switch back to its regular heating mode. Check if the thermostat settings are correct and set to the desired temperature. Confirm that airflow from the indoor units is not blocked by debris or objects. Keep all parts of the unit clean and clear to avoid obstruction during restart-up.If the issue persists, contact a professional HVAC technician for further assistance.

Heat Pump Blowing Cold Air During Defrost

Heat pump blowing cold air during defrostObstructed or dirty outdoor cabinet.Incorrect thermostat settings.Clogged air filter.Problem with the reversing valve.Other potential issues such as compressor contactors.Clean or clear away any debris from the outdoor unit.Check and adjust the thermostat settings to ensure it is set correctly for heating mode. Replace the air filter with a new one to ensure proper airflow. Inspect the reversing valve and associated components, and replace any faulty parts if necessary.Have a professional technician inspect and repair any faulty components, including compressor contactors and electric connections.

Heat Pump Blowing Cold Air On Emergency Heat

Issue Cause Solutions 
Heat pump blowing cold air on emergency heatElectrical issue or power outage.Low levels of refrigerant in the system.Disconnected lines carrying liquid refrigerantCheck for power outages or electrical issues and restore power if necessary. Inspect the refrigerant levels and, if low, contact a professional to recharge the systemVerify that no lines carrying liquid refrigerant have been disconnected and reconnect if necessary.

Heat Pump Blowing Cold Air But Fan Is Running

Heat pump blowing cold air but fan is runningCheck refrigerant levels and recharge if necessary clean or replace air filtersRepair or replace faulty valvesCheck refrigerant levels and recharge if necessary clean or replace air filters Repair or replace faulty valves

Heat Pump Blowing Cold Air In Winter

Heat pump blowing cold air in winterDirty air filtersIncorrect thermostat settingsProblems with the outdoor unitClean or replace dirty air filtersAdjust thermostat settings to desired temperature have an HVAC technician inspect and repair the outdoor unit, including checking for refrigerant leaks and clearing blocked fan blades

Heat Pump Blows Cold Air Then Warm

Heat pump blows cold air initially and then transitions to warmMalfunctioning thermostat settings, low refrigerant levels, faulty reversing valveCheck and adjust thermostat settings, inspect and refill refrigerant levels, repair or replace the reversing valve

Heat Pump Blowing Cold Air At Night

Heat pump blowing cold air at nightImproper thermostat settings, low outdoor temperatures, system malfunctionsCheck and adjust thermostat settings, ensure proper insulation and protection, clean filters for unobstructed airflow

Heat Pump Blowing Cold Air When Set To Heat

Heat pump blowing cold air when set to heatFailing reversing valve, clogged or dirty filters, low refrigerant charge, wrong thermostat settings, faulty defrost cycleInspect and repair or replace failing reversing valve, clean or replace clogged or dirty filters, check and refill refrigerant charge, adjust thermostat settings, repair or replace faulty defrost cycle


Can A Heat Pump Produce Cold Air?

It is possible for a heat pump to produce cold air even while set to heating mode. This can occur due to a number of causes, such as low refrigerant level, faulty compressor or valves, dirty air filters, and improper thermostat settings.

Cold air can also be the result of power outages, incorrect settings, inefficient running of the defrost cycle, and undersized/oversized units. Homeowners should always check their thermostat settings first for accuracy when this happens and replace any dirty filters before troubleshooting further.

They should also inspect the outdoor unit for dirt or dust build-up causing decreased efficiency if it was recently installed or hasn’t been cleaned in some time. Finally, they may need to have their refrigerant levels checked by an HVAC professional if all else seems good but still blowing cool air instead of hot air from their heat pumps.

Why Does My House Feel Cold With A Heat Pump?

A heat pump should provide enough heating for the space it is intended for, and if your house feels cold despite your heat pump running, there may be another cause. The most common reasons why a house remains cold with a working heat pump include inadequate insulation in the home or leaky air ducts.

Additionally, an undersized unit can also put strain on the system causing it to blow cool air instead of warm air. To properly troubleshoot this issue, homeowners may want to consider adding additional insulation throughout their home as well as inspecting any visible leaks from doors or windows that can lead to drafts inside the house.

The HVAC system should also have regular maintenance checks where technicians will inspect coil cleanliness and refrigerant levels in addition to checking airflow and seal integrity in order to prevent a drop off in performance.

Finally, if you are concerned that your existing unit size is not adequate for the space available then consult with an HVAC professional who can recommend sizing options based on square footage calculations and local climate data points.

Why Is My Heat Pump Blowing Cold Air In Heat Mode?

Most heat pumps use refrigerant to convert warm air from outdoors into cool air that is used to provide heating or cooling in your home. However, when a problem with the system arises, it can cause an issue called short-cycling where the unit will blow cold air instead of hot air.

This may be due to malfunctioning valves that keep the unit stuck in cooling mode, low refrigerant levels caused by leaking lines or a faulty reversing valve, dirty air filters which reduce airflow and limit efficiency, or improper thermostat settings that prevent the unit from running optimally.

The effects of each of these issues on your heat pump performance vary but can ultimately lead to energy loss and higher bills if not resolved promptly. To fix this issue you should start by checking your thermostat settings first as incorrect ones could be causing it to stay in cooling mode.

Clean any dirty filters too as clogs affect airflow significantly and cause frozen coils which restrict heat production further. Then inspect outdoor units for blocked vents since they impede circulation altogether and finally look for refrigerant line leaks since insufficient charge inhibits operation too.

How Do I Stop My Heat Pump From Blowing Out Cold Air?

When a heat pump starts blowing cold air, it can be difficult to determine the root cause without professional help. A few common issues that can lead to a heat pump blowing cold air include low refrigerant levels, dirty air filters, faulty compressor or valves, improper thermostat settings, and a faulty reversing valve.

First and foremost is checking and adjusting the thermostat settings according to manufacturer instructions. If there has been an interruption in power supply recently this might affect the accuracy of the settings so it’s important to double-check.

Cleaning or replacing clogged or dirty filters also helps ensure optimal performance from your unit; manufacturers also recommend changing them regularly even when no issue arises as part of preventive maintenance.

Additionally, inspect every component on both indoor and outdoor units for signs of wear and tear such as lack of refrigerant gas (low pressure) revealed by ice build up near taps or valves on pipes leading out from the evaporator coil in the indoor cabinet which can indicate an abnormal running condition due to insufficient coolant charge levels or incorrect expansion valve operation.

How do I fix a heat pump getting stuck on cool mode?

If your heat pump keeps blowing cold air it is best to contact a certified HVAC technician as soon as possible who can properly diagnose and repair any issues related to reversing the direction of airflow or poor temperature regulation.

How do I know when my outside unit needs cleaning?

If you notice that there is excessive dust, debris, leaves or cobwebs near and around your outside unit it may indicate that regular maintenance has been neglect and would benefit from professional cleaning services offered by an experienced technician such as changing out dirty filters and checking for proper venting connections which can help prevent future operational problems due to ineffective airflow within system components.

Can I unclog blocked condensation lines myself?

It is not recommended for individuals to attempt this type of work without having prior experience regarding water removal systems otherwise they could cause serious interference with electrical parts connected throughout equipment leading costly repairs down road if not properly serviced immediately after being discovered during thorough inspections carried out experts in identifying potential blockage locations before damage occurs


In conclusion, the issue of a heat pump blowing cold air should never be overlooked and needs to be addressed promptly. A few measures such as cleaning air filters, checking thermostat settings, inspecting outdoor units, and checking refrigerant levels can often help to fix this problem. In case these troubleshooting tips don’t work or if any other issues arise with the heat pump system, such as faulty compressors and valves, incorrect settings, power outages, dirty coils, or an undersized unit, it is best to contact a professional technician for inspection and possible repair or replacement.

Heat Pump