On Vancouver Island, winter temperatures don’t often dip far below freezing — but even mild coastal cold can challenge heat pumps if they’re not properly installed or maintained. If your system blows cool air, runs constantly, or ices up — you’re not alone.
Here’s why it happens, and what you can do to stay warm and efficient this winter.
❄️ Why Heat Pumps Struggle in Sub-Zero Temperatures
1. Cold Outdoor Air Reduces Efficiency
Heat pumps move heat — they don’t create it. Below 0°C, there’s less thermal energy to extract from the air, so efficiency naturally drops.
Older systems may struggle to keep up on frosty mornings.
2. Frost Build-Up Triggers Defrost Cycles
Humidity on Vancouver Island causes outdoor units to ice up, especially overnight. Your heat pump enters defrost mode (temporarily reversing), which may blow cool air indoors for 2–10 minutes.
Frequent cycles = energy loss & indoor discomfort
3. Undersized or Improperly Installed Systems
If your unit wasn’t sized for BC’s design temperatures, it may run non-stop or fail to maintain target heat. Ducted systems may also suffer from poor airflow.
🔧 What You Can Do to Stay Comfortable
- ✅ Clean your filters monthly (or replace)
- ✅ Clear snow/leaves from around the outdoor unit
- ✅ Ensure defrost mode is functioning correctly
- ✅ Add a backup heat source (electric baseboard or fireplace)
- ✅ Upgrade to a cold-climate rated unit (-20°C or colder)
💡 Pro Tip: Ask About a Backup Heat Kit
We can install electric backup coils inside your air handler to support your heat pump during cold snaps.
📍 Serving All of Vancouver Island
We inspect and service heat pumps in:
- Victoria, Saanich, Oak Bay, Langford
- Mill Bay, Duncan, Cowichan Valley
- Nanaimo and surrounding areas
📞 Schedule a Cold-Weather Heat Pump Inspection
AE Electric Ltd provides expert heat pump diagnostics and upgrades for winter performance across Vancouver Island.