Freeze Warning in Central Florida: How to Protect Your HVAC System and Pipes

Most Central Florida homes are built for heat, not cold. When the National Weather Service issues a freeze warning for Orange, Seminole, or Osceola County, homeowners who moved here from up north sometimes shrug it off. But homes designed for subtropical climates — with minimal insulation in attics and crawl spaces, and pipes that run through exterior walls or unconditioned spaces — are actually more vulnerable to freeze damage than homes in colder climates where builders account for it.

At 4 Seasons Air Conditioning, we see the aftermath every time temps drop into the upper 20s around Orlando. Here’s what you should do when a freeze warning is issued.

Understand What “Freeze Warning” Means for HVAC

Your outdoor AC unit and heat pump components can handle cold temperatures — most are rated for operation down to around 35°F. However, water that accumulates in condensate lines, drain pans, or near outdoor coils can freeze and cause damage or blockages. More importantly, freeze events in Central Florida are often accompanied by wind chills that make effective temperatures feel even colder. Heat pumps also lose efficiency as temperatures drop, sometimes triggering the backup heating strips to engage.

Protect Exposed Pipes Before the Temperature Drops

If your home has any pipes in unconditioned spaces — attics, garages, or along exterior walls — wrap them with foam pipe insulation before the freeze arrives. Pay particular attention to irrigation supply lines, which are almost always unprotected. Turn off your irrigation system’s main valve and run the zones briefly to drain standing water from the pipes. Many Orlando-area homeowners don’t think about this until after the damage is done.

Keep Your Heat Running, Even When You’re Away

This one seems obvious but gets ignored during brief cold snaps: keep your thermostat set to at least 55°F if you’re leaving the house. A cold interior dramatically increases the risk of pipes freezing in interior walls. If you’re going out of town and have a smart thermostat, set a minimum temperature schedule. Heat pumps operating at low outdoor temperatures will run longer cycles — that’s normal.

Cover Your Outdoor Condenser Unit (With Caution)

Some homeowners cover their outdoor condenser units during freeze events. If you do this, use a breathable cover specifically designed for HVAC equipment — not a tarp or plastic sheeting that traps moisture. More importantly: remove any cover before turning the system back on. Running an AC unit with a blocked condenser can destroy the compressor. If your unit has a freeze protection mode, make sure it’s enabled.

Inspect Your Condensate Drain Line Afterward

After a freeze event, check that your indoor air handler’s condensate drain line is flowing freely. Ice can form in the line during extreme cold and then cause a backup when it melts — leading to water damage in the ceiling or walls near your air handler. If you see water pooling around your indoor unit after the freeze, call for service immediately.

What to Do If a Pipe Bursts

If you do experience a pipe burst, turn off the main water supply immediately and call a plumber. For HVAC-related freeze damage — like a cracked condensate pan, frozen coil, or refrigerant line damage — call 4 Seasons Air Conditioning at (407) 295-9231. We serve all of Central Florida with emergency service available when the unexpected happens.

A little preparation before the freeze warning becomes a freeze event can save you thousands in repairs and a very miserable few days without heat or running water.