Can You Run Your AC in Winter?

Short answer: running a standard central air conditioner in cold weather is not recommended, and most manufacturers advise against it once outdoor temperatures drop below about 60°F. Below that point the refrigerant does not pressurize correctly, the compressor oil thickens, and running the system can damage the compressor. If you only need cooling on an occasional mild fall day, a brief run is usually fine. For steady cold-weather comfort, a heat pump or ductless mini-split is the right tool, since those are built to run efficiently in low temperatures.

So if you are asking whether you can run your AC in winter to cool a warm room, the safer move is to avoid it and use your heating system or a heat pump instead. The rest of this guide covers how to shut your AC down properly and protect it through the cold months.

How to Shut Down Your AC for Winter

Once you have decided to stop running your AC for the season, shutting it down properly protects it through the cold months. It takes about ten minutes.

1. Confirm the system is working before you turn it off

Give your AC one last check before it sits idle all winter. If something is off now, you want to know today, not on the first hot day next spring when you flip it on and nothing happens. Catching a small issue in the fall means it gets fixed on your schedule, not during a heatwave.

2. Cut the power at the outdoor unit

Turning your thermostat to off is not enough. On an unexpectedly warm winter day, the system can try to kick on, and running the compressor in freezing temperatures is exactly what damages it. Find the shutoff switch on the outdoor cabinet, usually under a small plastic cover, and flip it to OFF. This one step prevents the most common cold-weather AC damage.

Clean and Cover the Outdoor Unit

You do not need to be obsessive here, just thorough. Clear leaves, twigs, and debris from around the condenser, and rinse the outside of the unit with a gentle stream of water, avoiding the coils. Make sure nothing can blow into the cabinet over the winter.

If you want to cover it, use a breathable cover made for AC units rather than sealing it in plastic. A fully waterproof wrap traps moisture inside and invites rust and mold. A tarp works in a pinch, but secure it well against winter winds, and never wrap the whole unit airtight.

A Better Option for Winter Comfort

If the reason you were tempted to run your AC in winter is that one room still gets warm, or you want cooling and heating from a single system, a heat pump or ductless mini-split is built for exactly that. Unlike a standard AC, these run safely in cold weather and heat your home efficiently, so you are never stuck choosing between comfort and protecting your equipment.

Let EMCO Tech Handle It

Prefer to skip the ladder and the guesswork? Our technicians will inspect, shut down, and prep your system before the first freeze, and get your heating ready for winter in the same visit. Neglected outdoor units are especially vulnerable to debris, ice, and freezing damage across the Philadelphia area, including Dresher and the surrounding suburbs. Call 215-366-1001 to schedule your seasonal changeover, or contact us online.