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Heat Pump Acting Strange in the First Cold Snap? What It Means in Vancouver, WA
Steam, defrost cycles, aux heat and lukewarm air: what's normal for a heat pump in a Clark County November, what isn't, and why we check the whole house before blaming the unit.
The first real cold snap in Clark County is when heat pumps start getting phone calls. Most of what homeowners notice is normal. Some of it isn't. Here's how to tell the difference before anyone talks about replacing equipment.
Normal: steam and a short pause (defrost)
On damp 30s-and-40s mornings, frost builds on the outdoor coil. The system reverses for a few minutes to melt it. You may see steam, hear a whoosh, and feel cooler air indoors briefly. That's defrost doing its job.
Normal: air that feels "lukewarm"
Heat pump supply air runs around 90–100°F, cooler than a furnace. It feels mild on your hand but still heats the house steadily.
Worth a look: aux or emergency heat running all the time
Electric backup heat is expensive to run. If your thermostat shows aux heat constantly on a 40°F day, the cause could be thermostat settings, low refrigerant, a failing defrost control, or a house that loses heat faster than the system can make it.
Worth a look: ice that won't clear, short cycling, rooms that never catch up
A coil that stays iced over, a system that starts and stops every few minutes, or one cold bedroom are symptoms. They point to airflow, ducts, insulation or controls as often as to the unit itself.
We diagnose the house, not just the box
Before recommending any repair or new equipment, we check the thermostat setup, filter and airflow, duct leakage, refrigerant charge, defrost operation and how the home holds heat. Sometimes the fix is a setting. Sometimes it's a duct. You get the facts first.
Quick checks you can do today
- Replace a dirty filter.
- Clear leaves and debris 2 feet around the outdoor unit.
- Set the thermostat to Heat (not Emergency Heat) and avoid big setbacks.
- Make sure supply and return vents aren't blocked by furniture.
Still not right? Sub Zero Temp Control serves Vancouver, Camas, Battle Ground, Washougal and the Portland metro. Call (360) 839-7670 or book a diagnostic visit. Old School Values. Modern Comfort.