Freeze Warning in Tampa Bay: How to Protect Your HVAC System and Pipes

Tampa Bay’s Unusual Cold Stretch

Florida cold weather is supposed to be measured in mild inconvenience, not genuine hardship. This winter had other ideas.

The Hillsborough County Extreme Cold Watch issued January 30–31 brought overnight temperatures down to 25°F, with wind chills reaching into the teens in some inland areas. Then February brought another round of freeze warnings on the 23rd, giving Tampa Bay homeowners back-to-back cold events rare enough that many residents simply weren’t prepared.

Local authorities warned about the very real risk of burst pipes — not a concern most Florida homeowners keep in their mental checklist. HVAC systems, outdoor plumbing, and poorly insulated spaces all faced stress they’re generally not designed for.

If you made it through without damage, here’s how to be better prepared. If you’re still dealing with the aftermath, keep reading.

Protecting Your Outdoor HVAC Unit

Your outdoor condenser or heat pump unit is built to handle rain, humidity, and moderate cold — but extreme freeze events require some specific awareness.

Do not cover the unit completely with a tarp or plastic sheeting. This traps moisture inside and can damage components. If you want to protect the top from ice accumulation, a board placed loosely over the top (not the sides) is sufficient.

Let the defrost cycle do its job. Heat pumps in heating mode will periodically run a defrost cycle to clear frost from the outdoor coil — you may notice the unit steaming briefly and the indoor airflow feeling cooler. This is normal. Don’t interfere with it.

Never run the system in cooling mode during a freeze. Running AC when outdoor temps are near or below freezing can damage the compressor. If you need to cool the house (rare during a freeze event, but it happens in Florida), wait until temps are above 55°F.

If the unit is encased in ice, don’t chip at it. You can gently pour warm (not boiling) water over the coil to help it clear, or call us — a technician can evaluate whether the defrost system is functioning properly.

Pipe Protection Basics

Most Florida homes have plumbing that assumes mild winters. During a genuine hard freeze, that assumption becomes expensive.

Wrap exposed pipes — particularly those in the attic, under the home, in the garage, or on exterior walls — with pipe insulation foam available at any hardware store. This is a quick, inexpensive project that pays off immediately.

Drip your faucets. Moving water is much harder to freeze than still water. During a hard freeze warning, let cold-water faucets drip slightly, especially on exterior walls. Focus on faucets farthest from your water main.

Know your shut-off valve location. If a pipe does burst, the first thing you need to do is stop the water. Walk through your home now and locate the main shut-off before you need it under pressure.

Don’t forget attic pipes. Tampa Bay homes often have plumbing running through unconditioned attic spaces. These are among the most vulnerable during a hard freeze and are frequently the source of burst-pipe water damage — which, if severe enough, can damage nearby HVAC equipment, ductwork, and insulation.

Keeping Your Home Warm Efficiently

A few strategies that help during a cold snap without overloading your system or running up your bill:

• Avoid space heaters near return vents — they can skew your thermostat’s temperature reading and cause the system to cycle incorrectly
• Open interior doors — this allows conditioned air to circulate more evenly throughout the home, reducing cold spots
• Run ceiling fans on low, in reverse — the reverse setting (clockwise when viewed from below) pushes warm air that has risen to the ceiling back down into the living space
• Keep cabinet doors open under sinks on exterior walls to allow heat to reach pipes
• Keep your thermostat set consistently — dramatic setbacks during freeze events can cause your system to run continuously trying to catch up, working harder than a steady moderate setting

Schedule a Post-Freeze HVAC Checkup

Extreme cold puts real stress on heating systems — particularly heat pumps that ran near-continuously during the freeze event. Components like the defrost board, reversing valve, and compressor contactor can show wear after being pushed hard in unusual conditions.

A post-freeze checkup gives us a chance to catch any developing issues before they become failures during the next cold snap — or during the summer cooling season when you need the system most.

Learn more about what our technicians check during a heating maintenance visit, or call us to schedule.

At Bart DePury Air Conditioning, we’ve been keeping Tampa Bay families comfortable through everything Florida’s weather can throw at us since 1982. Call (813) 247-2278 to schedule your post-freeze inspection.