Heat Pump Not Heating in Winter? Causes & Fixes
Heat pumps are efficient heating solutions but have unique challenges in cold weather. Understanding how they work helps diagnose issues when your heat pump isn't keeping your home warm.
Signs & Symptoms
Possible Causes
- -Normal heat pump operation (air feels cooler than furnace)
- -Defrost cycle stuck or not working
- -Low refrigerant
- -Outdoor unit frozen
- -Reversing valve stuck
- -Backup heat not working
- -Dirty coils reducing efficiency
- -Too cold for heat pump alone
DIY Troubleshooting Steps
Try these steps before calling a professional (unless it's an emergency):
- 1Check thermostat settings (heat mode)
- 2Verify outdoor unit isn't buried in snow/ice
- 3Check air filter
- 4Make sure outdoor unit fan is running
- 5Check for ice buildup (defrost should clear it)
- 6Try emergency heat mode temporarily
When to Call a Professional
- !Ice buildup that doesn't defrost
- !System won't maintain temperature
- !Backup heat isn't working
- !Strange sounds from outdoor unit
- !Refrigerant leak suspected
- !Reversing valve problems
Estimated Repair Costs
Diagnostic: $89-$150
Minor Repair: $200-$500
Major Repair: $600-$2,500
Defrost sensor and refrigerant are moderate repairs. Reversing valve or compressor are major.
Prevention Tips
Frequently Asked Questions
Why does my heat pump blow cold air sometimes?
Heat pumps blow cool air during defrost cycles (normal, lasts 5-15 minutes) and produce air that's warm but cooler than a furnace. If it's truly cold air constantly, there's a problem needing diagnosis.
At what temperature is a heat pump not effective?
Standard heat pumps lose efficiency below 35-40°F and may need backup heat. Cold-climate heat pumps work down to 0°F or below. In mild Bay Area winters, standard heat pumps usually suffice.
Need Help?
This issue may require emergency service. Call now for immediate assistance.
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