The Best Summer Thermostat Settings for Michigan Homes

The thermostat is the one part of your cooling system you touch every day, and where you set it has more to do with your summer electric bill than almost anything else. We get asked all the time what the "right" number is. There isn't a single magic setting, but there is a smart way to run it that keeps a Michigan home comfortable without paying to cool empty rooms.

The short version: aim for around 78 when you're home, let it drift warmer when you're away or asleep, and put those changes on a schedule so you're not doing it by hand. Here's how that shakes out through the day and why it works.

A Simple Summer Schedule

You don't need to overthink this. Three settings cover the whole day for most families. Here's a starting point you can adjust to taste:

Every degree below 78 while you're home adds roughly 3 to 5 percent to your cooling cost, so the gap between 72 and 78 is real money over a Michigan summer. The setbacks while you're gone and asleep are where most of the savings come from. If those numbers feel too warm at first, drop them a degree or two and let your comfort, not a chart, be the judge.

Why "Set It and Forget It" Costs You

There's an old piece of advice that says pick one temperature and never move it. That guidance was really aimed at heat pumps and it doesn't fit a standard central AC. For most homes here, holding 72 all day means the system is cooling an empty house for eight or nine hours while everyone's at work.

Letting the house coast up to the low 80s during the day and pulling it back down before you get home uses less energy, full stop. The one thing you don't want to do is shut the AC off completely on a hot day. The house soaks up heat and humidity, and clawing all of that back is a longer, more expensive run than a modest setback would have been. There's more on this in our guide to lowering summer AC bills.

Let the Thermostat Do the Work

The reason most people don't save with setbacks is simple: they forget. You leave in a hurry, nobody bumps it up, and the AC runs all day for no one.

A programmable thermostat fixes that by following a schedule. A smart thermostat goes further. It can use your phone's location to raise the temperature when the house empties out and start cooling before you're home, and many models learn how long your house actually takes to cool so they hit your target on time. If you're weighing whether one is worth it, we broke that down in do smart thermostats actually save money. Whatever you use, the scheduling is the part that pays for itself. We install and set up smart thermostats if you'd rather not fuss with it.

Don't Forget Humidity

In West Michigan, comfort is as much about humidity as temperature. Muggy air feels warmer than the number on the wall, which is why 78 with dry air feels fine and 78 with sticky air feels awful.

Your AC removes some humidity as it runs, but if your house still feels clammy at a reasonable setpoint, that's worth addressing on its own rather than just cranking the temperature down. A too-short cooling cycle doesn't run long enough to wring out moisture. We get into this in our post on why your home feels muggy, and in bad cases a whole-house dehumidifier does more for comfort than another degree of cooling.

Small Habits That Let You Set It Higher

The higher you can comfortably set the thermostat, the less the AC runs. A few habits make a warmer setting feel fine:

• Run ceiling fans in occupied rooms so you feel cooler at a higher setpoint, and shut them off when you leave.
• Close blinds on the sunny side in the afternoon to keep radiant heat out.
• Keep a clean filter in the system so airflow stays strong and the house cools evenly.

Stack these together and 78 stops feeling like a compromise. If your house won't hold a reasonable setting no matter what you set, or the bills jumped without explanation, that can point to a system that needs service. We're happy to take a look.