How should I set the AC in a vacation home I rent out?
The safest approach for a vacation rental is to never let the AC sit off between guests, even for a short gap. Keep a warmer setpoint running during empty stretches to hold indoor humidity down, then bring it to a comfortable setting shortly before each check-in. Turning the system off entirely between bookings looks like the obvious savings move, but a short-term rental sits empty in short bursts all year, not once a season, so that shutdown-and-recovery cost repeats every turnover instead of happening just once.
A Vacation Rental's AC Never Really Gets a Season Off
A house that empties out for one long stretch, like an owner heading north for the summer, only has to survive one gap and one recovery. A vacation rental is a different pattern entirely. It cycles between occupied and empty over and over, sometimes for two days between guests, sometimes for two weeks in a slow month, and the calendar rarely gives much warning either way.
That repetition changes the question. Instead of picking one number to survive a single months-long absence, a rental needs a routine that works whether the next gap is two days or two weeks, and that can flip back to guest-ready on short notice. A single away setting that assumes months of quiet does not fit a property that might have someone checking in again by the weekend.
Why Turning It Off Between Guests Costs More Than It Saves
Shutting the AC off completely between bookings looks like free money. No guest, no need to cool the place, why pay for it. Florida humidity does not see it that way. A closed-up house with no air moving starts absorbing moisture into drywall, furniture, and linens within days, not months, and a rental left off for even a short gap can develop a musty smell fast enough to greet the very next guest.
None of that means the system needs to run as if a family were living there full time between every booking. It means a full shutdown trades a small amount of savings for a repeated cost: every time the system comes back from off, it has to pull both temperature and humidity back down before the house is fit for a guest again. A snowbird home pays that recovery cost once a year. A rental cycling fully off and on can pay it every few days, which adds up to more strain and more risk than keeping it running modestly the whole time.
Setting a Humidity Floor You Don't Go Below
A useful way to think about it is two setpoints instead of one. A vacancy floor is the warmest you let the house get while nobody is booked in, still cool enough to keep the system cycling on a regular basis and holding humidity down. A comfort setpoint is the lower, guest-ready temperature the house comes down to once someone is actually staying there.
The floor does the unglamorous work of protecting the house between guests without paying for full occupied-home comfort on every empty day. It is not about finding one perfect number. A larger home, a home with a lot of west-facing glass, or one that traps heat differently will each land somewhere slightly different. The point is keeping the system cycling steadily above that floor, never letting it sit idle long enough for humidity to climb unchecked.
Getting the House Guest-Ready Without Guesswork
Bringing the house from its vacancy floor down to a comfortable check-in temperature takes real time, more than the few degrees an occupied home adjusts each morning, since it is starting from a warmer, more humid baseline. If cleaning turnarounds are tight, that recovery window is one more reason not to let the vacancy floor drift too warm, or the system will not catch up before the next guest walks in.
Because a rental cycles through empty stretches all year instead of resting for one season, routine AC maintenance matters even more here. A slow drain line or a weakening capacitor that might get noticed quickly in an occupied home can sit unnoticed through an empty week in a rental, and the same problem is a lot more disruptive showing up mid-stay with a guest inside than it would be with an owner around to catch it early.
Managing an AC for a Property That's Never Empty for Long?
Call or text (239) 350-5234, or ask about the $99-per-visit Annual Comfort Plan, two visits a year so small problems get caught between guests instead of during a stay.