Winterizing Your HVAC System for Texas Freezes

Texas homes and Texas HVAC systems aren't built for hard freezes the way homes further north are — and most winters, that's fine. But when a freeze does hit, it hits fast, and the systems least prepared for it are the ones running the day it happens. A little prep in the fall prevents most of the failures we see during a cold snap.

Outdoor Unit Protection

• Cover the top only, never wrap the whole unit. A full wrap traps moisture and can cause the compressor to freeze up or corrode. A simple flat cover or piece of plywood over the top keeps ice and debris out of the fan while letting the sides breathe.
• Clear ice and snow buildup after a storm before running the system — ice around the base can block airflow and strain the compressor on startup.
• Keep a clearance of at least 12–18 inches around the unit clear of ice-damaged branches, which are a leading cause of storm-related unit damage.

Heat Pump Owners — Know Your Auxiliary Heat

If your home runs a heat pump, it almost certainly has an auxiliary (or "emergency") heat strip for when outdoor temperatures drop too low for the heat pump alone to keep up. This is normal — but it uses significantly more electricity than the heat pump's normal mode. If your system seems to be running constantly on aux heat during a mild cold snap rather than only during the coldest hours, that's usually a sign of a refrigerant or defrost problem worth having checked, not just cold weather.

Pipes & Water Lines

This isn't strictly HVAC, but it's the #1 thing that turns a cold snap into an expensive week: insulate exposed pipes (especially in attics, garages, and exterior walls), let faucets drip during a hard freeze, and know where your main water shutoff is. A frozen or burst line can also damage HVAC equipment located nearby, like an attic air handler.

What Actually Fails During a Texas Freeze

In our experience, the most common freeze-related HVAC failures aren't dramatic — they're small parts under sudden extra load: contactors and capacitors failing when a system that's been idle suddenly runs constantly, condensate lines freezing and backing up, and heat pumps stuck in defrost mode. A fall inspection catches most of these before a freeze ever arrives — see our fall inspection checklist for the full list.