Every hurricane season, we get the same phone call in the days before a storm: "Should I turn my AC off?" And every hurricane season, we get the other call a few days after: "The power's back on but the AC won't start." Most of the storm damage we see to AC systems in Lee and Collier Counties doesn't happen during the storm. It happens when the power comes back.
Here's exactly what we tell our own customers in Cape Coral, Fort Myers, and Naples to do with their system before, during, and after a storm — including the one step almost everyone skips.
Before the Storm: Pre-Cool, Then Shut It Down Properly. In the 24 hours before landfall, run your system a few degrees cooler than normal, around 72–74°F. You're banking cold air and pulling humidity out of the house while you still can. Once the outer bands arrive and the power starts flickering, it's time to shut down. Do it in this order: set the thermostat to OFF first, then flip the AC breaker off at your electrical panel (it's usually a double-pole 30–60 amp breaker labeled "AC," "A/C," or "Condenser"). Turning it off at the thermostat alone is not enough — the outdoor unit still has 240 volts sitting at the contactor, and that's what a surge rides in on.
✓ Pre-Storm AC Checklist (Do These 24–48 Hours Out)
Clear the area around the condenser: Patio furniture, potted plants, grills, kids' toys, and loose landscaping become projectiles in 100+ mph wind. Anything that can hit the unit gets moved inside or strapped down. Bent coil fins and cracked fan blades are the most common wind damage we repair.
Check your tie-down straps: Florida code requires the outdoor unit to be anchored to its pad. If your system was installed before 2002 or you've never looked, look now. A condenser that walks off its pad rips the refrigerant lines out of the wall.
Do NOT wrap the unit in a tarp: A tarp traps moisture against the electrical components and the wind shreds it anyway. A rigid, vented condenser cover is fine. Plastic sheeting is not.
Replace your air filter: If you lose power for several days, the house will get humid. A clean filter helps the system pull that moisture out faster on restart.
Take photos of the outdoor unit and the air handler: Front, back, both sides, and the data plate. Your insurance adjuster will want "before" pictures if there's damage. Thirty seconds now saves a lot of arguing later.
Turn the thermostat OFF, then the breaker OFF: When the power starts blinking, not after it's already out.
During the Storm: Leave It Off. Seriously. The utility grid during a hurricane is a mess of brownouts, surges, and power that comes on for four seconds and dies again. Every one of those events is a chance to fry a compressor, a capacitor, a contactor, or a control board. A compressor that tries to start against a brownout can lock up and never turn again — that's a $2,000–$4,000 repair on an older system, and often the point where replacement makes more sense. With the breaker off, none of that reaches your equipment. Yes, the house will get warm. A warm house is uncomfortable. A dead compressor is a warm house for two weeks in August.
⚠️ Running the AC on a Generator: Most portable generators (5,000–8,000 watts) cannot start a central AC system. The startup surge of a 3–4 ton compressor can hit 60–90 amps for a fraction of a second, which is more than the generator can deliver. Trying it either trips the generator or damages the compressor. If you want generator-backed AC, you need either a properly sized whole-home standby generator or a soft-start kit installed on your condenser, which cuts startup amperage by 60–70%. We install these. Don't wing it during the storm.
After the Storm: Inspect Before You Restart. This is the step everyone skips. The power comes back, everyone's hot, and someone runs to the thermostat. Stop. Before the breaker goes back on, walk outside and look at the condenser. Is there debris in or on top of it? Palm fronds, shingles, screen enclosure panels? Is it still level on the pad? Are the two copper lines going into the house intact, with the black insulation still on the larger one? Is there any sign the unit was underwater — a mud line, wet debris inside the cabinet, sand on the fan blades?
If your outdoor unit was submerged, do not turn it on. This applies to any flooding, but especially storm surge. Saltwater in the contactor, capacitor, and fan motor means the system will short, arc, or run for a few days and then fail. After Hurricane Ian, we saw dozens of units in Cape Coral and Fort Myers Beach that "worked fine" for a week after the storm and then died — because saltwater corrosion doesn't happen instantly. Insurance generally covers flood-damaged AC equipment, but only if you document it and don't destroy the evidence by running it. Call us, or call whoever you use, and have it inspected before it gets power.
✓ Post-Storm Restart Sequence (If the Unit Looks Undamaged)
Wait for stable power: Give it 30 minutes after the power returns. If the lights are still flickering, the grid isn't done fighting. Don't feed that to your compressor.
Clear the condenser: Remove debris from the top and sides. Gently rinse the coil with a garden hose (not a pressure washer) if it's caked in mud or leaves. Make sure nothing is blocking the fan.
Check the air handler and drain line: Look in the closet or garage where the indoor unit sits. Any water on the floor? Is the drain line still connected? A house that's been sealed up and humid for three days will produce a lot of condensate on restart.
Breaker ON, then thermostat ON: Reverse of the shutdown. Set the thermostat to cool, 2–3 degrees below the current room temperature. Don't set it to 68 hoping it'll cool faster. It won't — it'll just run longer.
Listen for the first 60 seconds: The outdoor fan should spin up smoothly and the compressor should hum steadily. Buzzing, clicking, a fan that won't spin, or a compressor that starts and stops repeatedly means shut it back off and call. Every additional restart attempt makes it worse.
Give it time: A house at 88°F and 75% humidity will take 6–10 hours to feel normal again. That's the system working, not failing. If it's been running 12+ hours and the house is still above 80, something's wrong.
The Humidity Problem Nobody Talks About. Three or four days without AC in a Southwest Florida summer means the inside of your house has been sitting at 80%+ humidity. Mold starts growing on drywall, in closets, and inside ductwork in as little as 48 hours under those conditions. When you restart, you're not just cooling the house — you're dehumidifying a swamp. Run the system continuously, keep interior doors open for airflow, and run bathroom exhaust fans. If your system has a dehumidify or "dry" mode, use it. If after two days you still smell must, especially when the AC first kicks on, call us. That's usually the evaporator coil or ductwork, and it's much easier to handle early.
At HomePros, we do post-storm inspections for a flat fee that's credited toward any repair. We check the contactor and capacitor for water intrusion, verify refrigerant charge (line damage causes slow leaks that don't show up for weeks), test amp draw on the compressor and fan motor, and confirm the drain line is flowing. If your system was flooded, we'll document it for your insurance claim. If it's fine, we'll tell you it's fine. We've done this after Irma, Ian, Milton, and every named storm in between. We'd rather look at 50 systems that are okay than replace one that could have been saved.
If You're a Seasonal Resident: If your home is empty during storm season, have someone you trust — a neighbor, a property manager, or us — do the shutdown and the post-storm inspection. A house that sits sealed up with no AC for a week after a storm, then has the AC slammed back on remotely with a storm-damaged condenser, is the worst-case scenario we see. It's also entirely preventable.