Why Is My Heat Pump Furnace Blowing Cold Air?

Heat Pump Blowing Cold Air? What You Can Do
Heat Pump Blowing Cold Air? What You Can Do from www.icsny.com


Having a heat pump furnace is a convenient way to keep your home warm during the colder months. However, sometimes you may find that your heat pump is blowing cold air instead of warm air. This can be frustrating and uncomfortable, especially during the peak of winter. In this article, we will explore some possible reasons why your heat pump furnace may be blowing cold air and provide some tips on how to resolve the issue.

Thermostat Settings

One common reason for a heat pump furnace blowing cold air is incorrect thermostat settings. Ensure that your thermostat is set to “heat” mode and the temperature is set higher than the current room temperature. It is also essential to check if the fan setting is on “auto” instead of “on.” If the fan is set to “on,” it will blow air continuously, even when the heat pump is not actively producing warm air.

Refrigerant Issues

Another potential cause of a heat pump furnace blowing cold air is low refrigerant levels. Refrigerant is responsible for absorbing and releasing heat, and if the levels are low, the heat pump may struggle to produce warm air. If you suspect refrigerant issues, it is best to consult a professional HVAC technician to inspect and recharge the system if necessary.

Outdoor Unit Obstructions

Check the outdoor unit of your heat pump furnace for any obstructions that may be hindering its performance. Leaves, debris, or even snow buildup can restrict airflow and cause the heat pump to blow cold air. Clear any obstructions and ensure that the outdoor unit is free from any blockages to allow proper heat exchange.

Thermal Expansion Valve

The thermal expansion valve (TXV) is a vital component in the heat pump system. If the TXV is faulty or not working correctly, it can cause the heat pump to blow cold air. A malfunctioning TXV may need to be replaced by a professional technician to restore proper functioning of the heat pump furnace.

Auxiliary Heat Issues

Heat pump furnaces often have auxiliary heat sources, such as electric resistance coils, to provide additional warmth during extremely cold weather. If these auxiliary heat sources are not functioning correctly, your heat pump may rely solely on them, leading to the blowing of cold air. It is advisable to have a professional inspect and repair any issues with the auxiliary heat components.

System Defrost Cycle

Heat pumps have a defrost cycle that helps prevent ice buildup on the outdoor unit during cold weather. The defrost cycle temporarily switches the heat pump to cooling mode, causing it to blow cold air. If the defrost cycle is too frequent or lasts for an extended period, it may result in cold air blowing into your home. Consult a professional HVAC technician to assess and adjust the defrost cycle if needed.

Dirty Air Filters

Clogged or dirty air filters can restrict airflow and reduce the efficiency of your heat pump furnace. This can result in the system blowing cold air. Regularly check and clean or replace the air filters according to the manufacturer’s recommendations to ensure proper airflow and efficient heating.

System Size and Capacity

If your heat pump furnace is undersized or overtaxed, it may struggle to generate enough warm air to heat your home adequately. Consult an HVAC professional to determine if your system’s size and capacity are suitable for your home’s heating requirements. They can recommend appropriate adjustments or replacements if necessary.


If your heat pump furnace is blowing cold air, it is essential to identify the underlying cause and address it promptly. Whether it is a thermostat issue, refrigerant problem, or any other technical malfunction, seeking professional help is crucial for a long-term solution. Regular maintenance and timely repairs will ensure that your heat pump furnace operates efficiently, keeping your home warm and comfortable throughout the winter season.