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Heat Pump Heating vs Cooling Mode Explained — Scarborough Homeowner Guide
A heat pump is the only HVAC system that works in both heating and cooling mode using the same refrigerant circuit. Understanding how it switches helps you troubleshoot problems.
How the Reversing Valve Works
The key component is the reversing valve — a 4-way valve that redirects refrigerant flow:
- Cooling mode: Refrigerant absorbs heat from indoor air (evaporator coil) → compressed → releases heat outdoors (condenser coil) → repeat
- Heating mode: The reversing valve flips the cycle. Refrigerant absorbs heat from outdoor air (even at −25°C) → compressed to amplify heat → releases heat indoors
Common Heat Pump Mode Problems
- Blows cold air in heat mode — Reversing valve stuck in cooling position. Requires professional replacement.
- Heat pump runs but does not heat well below −10°C — Normal for standard heat pumps; cold-climate models work efficiently to −25°C
- Defrost cycle — Heat pump briefly switches to cooling mode to melt ice off outdoor coil. Normal. Takes 5–15 minutes.
Why is my heat pump blowing cold air in heat mode?
If your heat pump blows cold air in heat mode in Scarborough, the most likely cause is a stuck reversing valve, which requires professional repair. Other causes: low refrigerant, defrost cycle running (normal, 5–15 min), or temperatures below the heat pump’s rated range. Call Madina Mechanical at (416) 424-4328 for same-day heat pump diagnosis.
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Heat Pump Repair Scarborough: (416) 424-4328
