The Best AC Thermostat Temperature for Florida Homes (Day, Night, and Vacation Settings)

Every Florida homeowner has heard some version of "set your thermostat to 78°F to save money." It is everywhere — FPL energy tips, government efficiency campaigns, every "summer savings" article that has ever been written. It is also wrong for South Florida.

The 78°F number comes from a 1980s Department of Energy recommendation built around a national average climate. It assumes outdoor humidity around 55 percent. In Broward County, outdoor humidity averages 75 to 85 percent year-round. At those humidity levels, 78°F indoor air feels closer to 82°F — uncomfortable enough that most people drop the setpoint back to 74 and run the system harder than if they had just started at 76 in the first place.

Here is what actually works in a Florida home, with the day/night/vacation settings we recommend after running thousands of energy audits across Broward County.

The Honest Answer: 75 to 77°F Daytime, 73 to 75°F Nighttime

For most Broward homes during summer, the comfort and efficiency sweet spot is:

Now let me explain why each of these is what it is.

Why Humidity Beats Temperature for Florida Comfort

The reason 78°F feels miserable in Florida and pleasant in Phoenix has nothing to do with the AC. It has to do with how human skin sheds heat. We cool ourselves through evaporation — sweat leaves the skin, evaporates, takes heat with it. The drier the surrounding air, the faster evaporation happens, the cooler you feel.

At 60 percent indoor humidity, 78°F feels like 82°F. At 45 percent humidity, the same 78°F feels like 76°F. Same temperature on the wall, completely different experience on your skin.

This is why the most effective bill-reduction strategy in Florida is not raising the thermostat — it is lowering the indoor humidity so a higher temperature still feels comfortable. Read our Florida humidity guide for the full play.

Daytime Strategy (When You Are Home)

Start at 76°F. Live there for 3 days. If you are comfortable, leave it. If you feel slightly warm, the issue is probably humidity not temperature — check your indoor humidity with a $15 hygrometer.

If indoor humidity is above 55 percent: you are not too hot, you are too damp. Lowering the thermostat will only fix this temporarily because the AC will short-cycle (run brief, cold bursts that do not remove moisture). Better answers: clean the coils, check duct leaks, add a whole-home dehumidifier, or right-size the system if it is oversized.

If indoor humidity is under 50 percent and you still feel warm: drop to 75°F and re-evaluate. Most healthy adults find 75 to 77°F with low humidity ideal for active daytime hours.

Nighttime Strategy (Sleeping Hours)

The body's core temperature drops 1 to 2 degrees naturally during sleep, which is why a slightly cooler bedroom helps you fall and stay asleep. Sleep researchers consistently recommend 65 to 72°F for the bedroom — cooler than the daytime ideal.

For Florida homes with central AC (one thermostat for the whole house), pushing the master bedroom down to 65 means overcooling the rest of the house at night. Compromise: set the central thermostat to 73 to 75°F at night and use a bedroom ceiling fan to make the master feel 4 to 5 degrees cooler.

If you have a smart thermostat with remote room sensors (ecobee SmartSensor, Honeywell T9 with sensors), you can prioritize the bedroom at night without running the whole house at 70. The remote sensor reads master bedroom temperature, the AC runs to satisfy that sensor specifically. This is one of the best uses of smart-thermostat technology in Florida.

Away-From-Home Setback (The Biggest Single Savings)

This is where almost all the "raise your thermostat to save money" advice should land. If you are at work, school, or running errands for 6+ hours, the house does not need to be 75°F. Bumping the setpoint to 80°F for those hours, then dropping it back to 76 before you arrive home, saves real money without any comfort loss.

Math: 3 to 5 percent savings per degree raised, times 4 degrees, times 8 hours per day. On a $200/month summer bill, this is $24 to $40/month. That is $150 to $250 saved over a Broward summer (May through October).

Two warnings specific to Florida:

• Do not raise above 80°F for away periods. Beyond 80, indoor humidity creeps above 60 percent and you risk mold growth on porous surfaces (drywall, carpet, fabric).
• Do not turn the AC OFF for away periods. Same humidity issue, much worse. A system running occasionally at 80°F maintains dehumidification. A system OFF for 9 hours does not.

The right way to do this is a programmable or smart thermostat with a daily schedule. Manually adjusting every morning and evening lasts about 4 days before you forget.

Vacation Strategy (1 Day to 2+ Weeks)

This is where Florida-specific advice diverges most from the national norms.

The instinct is to turn the AC off when you leave for vacation. In any other climate, that would be fine. In Florida, that is how homeowners come back to a humidity-warped piano, swollen kitchen cabinet doors, mildew along baseboards, and a musty smell that takes weeks to clear.

The correct setpoint by trip length:

• 1 to 3 days: 82°F. The AC will cycle on briefly to keep humidity below 60 percent, using minimal energy.
• 4 to 7 days: 83 to 85°F, plus close all blinds and curtains to reduce solar gain. Consider unplugging electronics that generate heat.
• 1 to 2 weeks: 85°F plus a portable dehumidifier set to 55% in the largest living area, draining to a sink or bathtub. Belt-and-suspenders mold protection.
• 2+ weeks: Arrange for a friend or neighbor to walk through every 4 to 5 days and verify indoor conditions look right. Have World Air's number handy in case anything is off.

Hurricane Pre-Cool Strategy

This is a specific Florida tactic worth knowing. When a named storm is forecast within 24 to 48 hours, drop the thermostat to 72°F for 4 to 6 hours before the storm arrives. Pre-cool the house to the lowest setpoint you can tolerate. Once you lose power, that cooled mass (walls, furniture, contents) will radiate cool for 12 to 24 hours, buying you an extra night of sleep without melting.

Pair this with running dehumidifiers during the pre-cool period to also drop indoor humidity to 40 to 45 percent — same logic applies, lower humidity = longer comfort during power outage. See our hurricane HVAC prep checklist.

Smart Thermostats Worth Owning in Florida

Smart thermostat ROI in Florida is one of the strongest in any climate, because the heat dome is brutal and the savings from automation compound over a 10-month cooling season. The three we install most often:

ecobee Premium ($249)

• Best for: homes with hot/cold rooms; serious smart-home users
• Pros: SmartSensors let you balance the master bedroom and other priority rooms; built-in air quality monitor; Alexa speaker built in
• Cons: more setup complexity; needs C-wire (we add one during install if absent)
• Best Florida feature: SmartSensor in master bedroom for nighttime priority

Google Nest Learning Thermostat ($279)

• Best for: homes wanting "set and forget" automation
• Pros: learns your patterns over 1-2 weeks; clean app; works without C-wire on most systems
• Cons: harder to override for specific occasions; learning sometimes overshoots in extreme FL heat
• Best Florida feature: away mode automatically activates when geofencing detects nobody home

Honeywell T9 with RoomSmart ($199)

• Best for: budget-conscious homeowners who want zone-style control
• Pros: priority room sensors at lower price; reliable Honeywell hardware; works with most systems
• Cons: less polished app than Nest/ecobee; weaker automation
• Best Florida feature: humidity-based control (will continue cooling slightly past setpoint if humidity is high)

Installation is straightforward but Florida systems often need a C-wire added. Plan on $250 to $450 installed depending on whether C-wire work is required. World Air installs smart thermostats as a standalone service or as part of any AC tune-up or replacement.

Common Florida Thermostat Mistakes

Five things we see in nearly every "high electric bill" service call we run:

1. Thermostat located in direct sunlight or near a hot kitchen. Reads artificially high, system runs more than it should. Solution: relocate, or use a smart thermostat with a remote sensor in a better spot.
2. Cranking the temperature way down to "cool faster." The AC does not cool faster at 65 than at 73. It runs longer. Set the temperature you want; the system reaches it at the same pace.
3. Switching between COOL and AUTO modes constantly. Pick one and stick with it. AUTO is correct for most Florida homes.
4. Fan setting on ON instead of AUTO. Fan-on continuously circulates air but increases humidity because moisture on the coil gets re-evaporated into the air during off cycles. Use AUTO unless you have a specific air-quality reason.
5. Setting the AC OFF during vacation. Already covered above — mold risk far exceeds energy savings.