Should I Cover My AC Unit in the Winter?
As temperatures drop in Missouri, homeowners start wondering if they should cover their air conditioner to protect it from snow and ice. It seems logical, but the wrong type of cover can do more harm than good.
Here’s what our technicians at Fresh Air Heating & Cooling recommend for Chesterfield homeowners each fall.
1. Why You Should Not Fully Cover Your AC Unit
Central AC units are built to be outside. A tight, full cover can:
Trap moisture and lead to rust or mold.
Invite rodents looking for a warm spot.
Hold in condensation that freezes overnight.
Most manufacturers design the unit’s casing to handle rain and snow. Keeping it completely sealed actually blocks airflow and creates the perfect conditions for corrosion.
2. When a Partial Cover Makes Sense
If your unit sits under trees that drop leaves, acorns, or branches, a top-only cover can help.
✅ Use a breathable fabric that covers just the top 12–18 inches to keep debris out without sealing the sides.
🧠 Pro Tip: Remove the cover as soon as temperatures warm up in spring to prevent mildew and ensure the compressor can “breathe.”
3. Best Ways to Protect Your Outdoor Unit
Instead of a full cover, focus on these simple steps each fall:
Clear debris: Remove leaves and sticks within two feet of the unit.
Shut off power: Flip the disconnect switch to prevent accidental starts.
Clean the coil: Rinse away dirt before temperatures drop below freezing.
Schedule a tune-up: Your technician will inspect components and ensure the system is ready for spring.
4. Heat Pump Owners: Don’t Cover It!
If you own a heat pump, never cover it. Heat pumps run all winter long and need clear airflow to operate efficiently.
A cover will trap heat and moisture, causing ice buildup and expensive repairs.
Bottom Line: Skip the Full Cover
Missouri winters won’t hurt a well-maintained AC unit, but a full cover might.
Keep it clear of debris, use a breathable top cover if needed, and schedule a fall inspection with Fresh Air Heating & Cooling to keep your system ready for next summer.
Schedule Fall Furnace Check
in Chesterfield, MO and Surrounding Areas
Don’t let furnace smells catch you off guard. Book your seasonal tune-up with Fresh Air Heating & Cooling today.