Why Is My Heat Pump Blowing Cool Air in Winter?

Photo: Wikideas1, CC0, via Wikimedia Commons

On a chilly Plano morning, you put your hand over a vent and the air feels lukewarm. Before you worry, here's what's normal and what isn't.

1. It may be working fine

Heat pump air usually comes out around 90 degrees. That's warm, but it can feel cool against your hand, especially compared to a gas furnace.

2. Defrost mode

When it's near freezing, the outdoor unit pauses to melt frost off its coil. You may feel cool air and see steam outside for a few minutes. That's normal.

3. Thermostat settings

Make sure it's set to Heat, not Cool, and the fan is on Auto instead of On.

4. A dirty filter

A clogged filter chokes airflow and makes the system work harder. Check it monthly in winter.

5. Low refrigerant or a bad part

If the air stays cool for more than 15 minutes, or the outdoor unit is iced over, it's time for a pro.

Hesse Air Conditioning & Heating proudly serves Plano and Collin County. Call us at 214-505-5483.