How to protect a heat pump from snow
Metro Vancouver winters are usually mild, but the Fraser Valley and higher-elevation neighbourhoods can see real snowfall and cold snaps. Your heat pump keeps working through winter, so snow and ice management matters for reliable heat.
A heat pump needs airflow and drainage to run efficiently. When snow piles around the outdoor unit or ice builds on the coil, the system loses performance and may run its defrost cycle more often.
Below, HeatLand’s licensed technicians explain how to keep your unit above the snow, clear it safely, and recognize when frost is normal versus when it’s a sign to call for service.
Elevate and Position the Unit
The single best defence against snow is height. Outdoor units should be mounted on a stand, wall brackets, or a raised pad that lifts the base above your area’s typical snow accumulation. This keeps the coil out of drifts and lets meltwater drain away instead of pooling and refreezing under the unit. If your heat pump sits low to the ground and you get regular snow, ask a technician about raising it.
Position also matters. Avoid mounting under a roofline where snow and ice slide or drip directly onto the unit, which can damage the fan or cause ice buildup. Ensure the unit sits where meltwater and defrost runoff can escape freely. Good positioning done at install time prevents most winter snow problems before they start, and it’s worth reviewing if your current placement causes repeated icing.
Clearing Snow the Safe Way
After a snowfall, gently remove snow from the top, sides, and fan area of the outdoor unit by hand or with a soft broom. Keep the intake and discharge clear so the unit can breathe. Clear a path around the base so drifting snow doesn’t pile back against the coil, and make sure the base and any drain holes stay open so meltwater can escape.
Never chip at ice with a shovel, screwdriver, or sharp tool; you can puncture the coil or refrigerant lines. Don’t pour hot water directly on the coil either, as rapid temperature swings can cause damage. If ice has built up on the coil, let the defrost cycle work, or shut the unit off and allow it to thaw. Keep the fan blades free of snow before restarting so the motor isn’t strained.
Normal Defrost vs. a Real Problem
A light coat of frost and periodic steam or a puddle under the unit are normal. Heat pumps run an automatic defrost cycle in cold, damp weather, briefly reversing to melt frost off the coil. You may see steam rising and hear a whooshing sound; this is expected in our coastal climate.
Call a licensed technician if the coil stays encased in thick ice that never clears, the unit is buried in solid ice, the fan is frozen and won’t spin, or you lose heating. Repeated heavy icing can point to a stuck defrost control, low refrigerant, or drainage problems that trap water. Don’t force a frozen fan or run a heavily iced unit, as that can damage the compressor. Any electrical burning smell or tripped breaker in freezing weather is a safety issue for a professional to inspect.
Quick Checklist
- Mount the unit above expected snow depth
- Clear snow from the top, sides, and fan after storms
- Keep base drain holes open for meltwater
- Never chip ice with sharp tools
- Avoid mounting under dripping rooflines
- Call a technician if the coil stays fully iced
| Situation | Normal? | What to Do |
|---|---|---|
| Light frost on coil | Yes | Let defrost cycle run |
| Steam and puddle under unit | Yes | No action needed |
| Snow piled around base | No | Clear gently by hand |
| Coil fully encased in ice | No | Thaw or call a technician |
| Fan frozen and not spinning | No | Power off, call for service |
Frequently Asked Questions
Should I cover my heat pump when it snows?
Do not fully cover a running heat pump, because it needs airflow year-round and trapping moisture invites corrosion. The best protection is elevating the unit above snow level and clearing snow by hand. If your unit sits under a dripping roofline, a technician can suggest a top-only baffle that keeps airflow open.
Is it normal for my heat pump to ice up in winter?
A thin layer of frost is normal, and the unit’s defrost cycle melts it automatically, sometimes producing steam. What is not normal is thick ice that never clears, a frozen fan, or lost heat. If icing keeps returning heavily, book a technician to check the defrost control, refrigerant, and drainage.
Can I pour hot water on my iced-up heat pump?
Avoid pouring hot water directly on the coil, since rapid temperature changes and refreezing can cause damage. If the coil is iced, let the defrost cycle run or turn the unit off and allow it to thaw gently. Never chip at ice with tools, which can puncture the coil or refrigerant lines.
Will snow damage my heat pump?
Light snow usually isn’t a problem if the unit is elevated and clear, but drifts that block airflow or ice that jams the fan can cause damage and lost heat. Keep snow off the top and sides, keep drains open, and elevate the unit. Persistent heavy icing warrants a professional inspection.
Reviewed by the HeatLand Heating & Cooling team — licensed HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. This article is for general guidance only. If you smell gas, suspect a carbon monoxide leak, or are unsure about any electrical or gas component, stop troubleshooting immediately and call a licensed technician or 911.