The thermostat wars are real: someone wants 68°, someone's wearing a sweater in July, and the electric bill referees. Here's what the numbers actually say about summer settings in North Texas — and how to be comfortable for less without living in a sauna.
What each degree costs
The working rule: every degree you raise your summer setpoint saves roughly 3–5% on cooling costs. In a typical Dallas home with a $350 August bill (most of it cooling), the difference between 71° and 76° can be $50–$80 in a single month. Energy Star's official recommendation of 78° is where efficiency lives — though we'll be honest, most Texans find that ambitious. The real advice: find the warmest setting your household genuinely accepts, then hold it steady.
Humidity is the cheat code
The reason 75° feels miserable in some homes and fine in others is humidity. Dry air at 76° feels cooler than damp air at 73°. Ceiling fans (which let you set the thermostat 2–3° higher at zero cooling cost), long gentle AC cycles, and a system that's properly sized all keep indoor humidity down — which means comfort at higher, cheaper setpoints. This is also why an oversized AC costs you twice: it short-cycles, humidity stays high, and you compensate by cranking the setpoint down.
Away from home: setback, don't shutdown
Turning the AC off while you're at work is a false economy in Texas — the house heat-soaks (walls, furniture, attic mass), and the system spends brutal hours recovering into peak-rate evening heat. The right move is a setback: 4–7° above your comfort setting while away, then recovery before you're home. A smart thermostat automates exactly this, which is where most of its advertised savings actually come from.
The pre-cooling strategy for Texas rate plans
Many Texas electricity plans charge the most between about 2 and 8 PM — exactly when your AC works hardest. Pre-cooling flips this: cool the house a couple of degrees below normal during cheap late-morning hours, then let it drift up through the expensive window with the AC coasting. In well-insulated homes on time-of-use plans, this shaves real money without any comfort loss. It's fiddly to run by hand and trivial with a smart thermostat schedule — we set these up all the time.
From the team at Strike Force HVAC
Want your thermostat working this hard for you? We install and program smart thermostats across DFW.