Is your heat pump delivering air that seems colder than normal? If it is, be aware that it has to work harder during cold weather to produce heat. Even so, it may have other issues that affect the temperature of the air it delivers. Note: To prevent icing, a heat pump may go into a defrost mode; when this happens, it can temporarily deliver cold air.
1) Be sure the thermostat is set to “Heat." Try raising the set temperature 5 degrees and waiting a few minutes for the system to engage.
2) Be sure nothing is blocking the flow of air. All room heating registers should be open.
3) Check the heat pump filter to make sure it isn't clogged. If necessary, change the filter. Also be sure nothing is blocking the supply air.
4) Be sure the auxillary heating elements are working (if your heat pump has these). See Heat Pump Troubleshooting & Repairs.
5) Clean the coils of the outdoor condensing unit (see Central Air Conditioner Repairs).
6) If these steps don’t work, call a heating contractor or heat pump repair technician.
