What should snowbirds set their AC to when leaving for the summer?
Most snowbirds leave the AC running while they're away for the summer, commonly set somewhere between 78 and 82 degrees with the fan on auto, rather than shutting the system off completely. Keeping it running, even at a higher setpoint, helps manage indoor humidity in a closed-up Florida house. Turning the AC off for months is a common way to come home to a musty smell, mildew, or worse. The exact number matters less than making sure the system keeps cycling.
Why an Empty House Still Needs the AC Running
Southwest Florida stays humid through the summer whether anyone's home or not. A closed house with no air moving and no AC running doesn't just get warm, it gets damp. Moisture works its way into drywall, cabinetry, and fabric over the weeks nobody's there to notice.
It feels wasteful to keep paying to cool an empty house. That instinct makes sense in a drier climate. In Florida, though, the AC's main job while you're gone isn't comfort, it's keeping humidity from climbing into the range where mildew and musty odors get started.
This isn't unique to snowbird season, either. Any Florida home left closed up for an extended stretch, whether that's a slow month at a second property or a long trip, deals with the same math. The longer a house sits sealed with no cooling and no air movement, the more time humidity has to work its way into places it's hard to get back out of.
A Common Setting: Warmer, Not Off
A common approach is setting the thermostat somewhere in the high 70s to low 80s and leaving the fan on auto rather than running it constantly. That lets the system cycle on its own schedule to manage humidity, without running as if someone were still living there.
Some homeowners go a couple degrees warmer than they'd ever set it while home. The point isn't finding one exact magic number, it's leaving enough room for the system to keep turning on and pulling moisture out of the air on a regular basis, all summer long.
There's no single number that works for every house, either. A larger home, a house with a lot of glass, or one that gets more direct sun through the day may need a slightly different setpoint than a smaller, well-shaded one to keep the system cycling at a similar pace. The high-70s-to-low-80s range is a starting point, not a rule.
Humidity, Not the Thermometer, Is What You're Managing
The number on the thermostat is really a stand-in for the thing that matters more: keeping indoor humidity down. A system that's cycling regularly at a warmer setpoint is doing that job. A system that's off, or set so warm it barely runs, isn't.
Some households add a standalone humidistat or dehumidifier for extra peace of mind on top of the AC. That's a separate decision from what to set the thermostat to. Either way, the AC running on some kind of schedule is the part doing most of the work.
It also helps to think about what happens right when you get back. A house that's been sitting at a warmer setpoint for months will take some time to pull back down to a comfortable temperature and humidity level once you're home and asking more of the system again. That's normal and expected, not a sign anything went wrong while you were away.
A Pre-Departure Check Matters More Than the Exact Number
A small problem left unattended for months has a lot more time to turn into a big one when nobody's around to notice a strange sound or a slow leak. A dirty filter restricting airflow, or a drain line just starting to slow down, are the kind of things that are easy to catch before a trip and harder to catch from out of state.
Checking or replacing the filter before you lock up is a simple step any homeowner can do. Beyond that, a pre-departure AC maintenance visit is a common way snowbirds handle the rest, since it's a chance to have the air handler and condenser both looked over before the system runs alone all summer.
It's also worth thinking about who has a key or access while you're gone. If a neighbor, property manager, or family member is checking on the house periodically, letting them know the general plan, and giving them a number to call if something seems off, like water where it shouldn't be or a smell that wasn't there before, closes the gap between visits.
Exclusive Cooling Solutions' $99-per-visit Annual Comfort Plan is built around this kind of timing: two visits a year, a 34-point inspection covering the air handler and condenser, one before the season and one after. For a snowbird schedule, that lines up naturally with leaving and coming back.
Heading North for the Summer?
Call or text (239) 350-5234 before you go. A pre-season visit under the $99-per-visit Annual Comfort Plan is an easy way to leave with one less thing to think about.