Every July we stand in hallways next to thermostats, and the same handful of settings questions come up at almost every one. Here are the answers we give — the ones that actually show up on a power bill.
Setting it lower does not cool the house faster. Your AC has two speeds: on and off. Setting 68 instead of 74 doesn't make it work harder or quicker — it just makes it run longer, sail past the temperature you actually wanted, and bill you for the overshoot. Pick the number you want and let it get there.
Fan AUTO, not ON — this one matters here more than most places. With the fan ON, air keeps blowing between cooling cycles. That feels harmless, but the indoor coil is wet with the humidity your system just pulled out of the air — and a constantly running fan blows a good part of that moisture right back into the house. In a West Tennessee summer, that's self-sabotage. AUTO lets the moisture drain away instead.
Humidity is half of comfort. A dry 74° feels better than a damp 70° — and costs meaningfully less. If your house is at temperature but feels sticky, the fix usually isn't a lower setpoint (see the fan note above, and have the system checked — short-cycling and oversized units don't dehumidify well).
Ceiling fans cool people, not rooms. The breeze lets your skin feel several degrees cooler, which lets you nudge the thermostat up without noticing. But a fan spinning in an empty room is just a light bill — turn them off when you leave.
Away-mode: nudge, don't slam. Bumping up 4–5° while you're at work saves real money over a month. Shutting the system OFF doesn't — the house soaks up heat and humidity all day, and the AC pays it all back (plus interest, in muggy air) the moment you're home. In our climate, moisture is the reason "off all day" backfires.
If none of this helps, the thermostat isn't the problem. A system that can't hold temperature on a normal 95° day — not a record-breaker, a normal one — is asking for a checkup: dirty coil, weak capacitor, low charge, or choked airflow. That's a service call, and catching it early is always the cheaper version. We're at (901) 699-7763.
