Should you cover your AC condenser in winter?
The internet is split. We're not. Here's what actually helps, what's harmless, and what's the worst thing you could do (a literal hardware-store mistake we see every year).
- Author
- Maya R.
- Role
- Service tech
- Published
- November 22, 2025
- Reading time
- 4 min
The short version: no full plastic cover. A breathable top-only cover, fine. A piece of plywood weighted on top, fine.
Why a full cover is bad
Snow melt and rain need to drain through the unit. A sealed plastic cover traps moisture against electrical components and the contactor, then re-freezes inside. We've replaced contactors, blown contactors, and twice an entire compressor that died from corrosion under a winter cover.
What's helpful
- A piece of plywood or a fitted top-only cover, weighted down, to keep ice and falling icicles off the fan
- Clearing snow from around the unit so the spring start-up isn't fighting a drift
- Removing leaves before first snow if the unit is under a tree
Heat pumps: do not cover
If your unit is a heat pump, do not cover it. It needs to run all winter. Build a snow shelter above it if you must, but never wrap it.
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