If you’re recognizing a odor from your heat pump, it’s trying to tell you that something is wrong. We’ve put together a list of the most popular six heat pump smells, what causes them and how you can repair them.

  1. Heat pump smells musty
  2. Heat pump smells like fish
  3. Heat pump smells like sulfur
  4. Heat pump smells like sewer
  5. Heat pump smells like burning
  6. Heat pump defrost cycle smells

1. Heat Pump Smells Musty

If your heat pump smells musty, there’s most likely mold growing on wet evaporator coils or in the ductwork. This heat pump odor is often called dirty sock syndrome. You can deter this by scheduling routine heat pump maintenance and air duct cleaning.

2. Heat Pump Smells Like Fish

If your heat pump smells like fish, there could be several things wrong:

  • Motor is too hot
  • Wiring issue
  • Plastic components or coating is melting
  • Other mechanical difficulties

Electrical problems are dangerous, so shut your heat pump system off immediately at the breaker box and get a hold of us at for heat pump repair.

3. Heat Pump Smells Like Sulfur

Often when you have a rotten egg smell, you’ve got a gas leak. But your heat pump doesn’t use natural gas. If your heat pump smells like sulfur, a tiny animal may have crawled inside it for warmth and died. One of our Rescue Heating & Air technicians can remove the smell by cleaning your heat pump.

4. Heat Pump Smells Like Sewer

As we mentioned earlier, your heat pump is electric, so any rotten egg smells are connected to a gas leak somewhere else. If your heat pump smells like sewer, you might be dealing with a backed-up or broken sewer line. We suggest getting in touch with a company that does sewer line repair.

5. Heat Pump Smells Like Burning

You might be dealing with an electrical issue if your heat pump smells like burning, burning plastic or burning rubber. This burning smell can be due to melting plastic on electrical wires. Electrical troubles in HVAC systems are serious and could lead to a fire. If you notice this smell, shut off your heat pump at the breaker and get a hold of us at .

6. Heat Pump Defrost Cycle Smells

Like we talked about earlier, a dirty socks smell can happen when your evaporator coils need cleaning. You might experience this smell when your heat pump goes into defrost mode.

It’s common for your heat pump to have to turn on defrost mode during heating season. When the air is much colder, frost can form quickly on the coils from condensation and restrict heating. During defrost mode, your heat pump shortly switches to ac to clear away the frost.

Having a Rescue Heating & Air HVAC technician clean the coils will help get rid of the odor.

Trust Us with Your Heat Pump Repair Needs

It can be hard to troubleshoot your heat pump by alone. Your comfort matters to us at Rescue Heating & Air, so you can count on our professionals to help you when you need us. When you need heat pump repair in that you can rely on, call us at .