How Much Does It Cost to Run Your AC in Texas?
Last updated: October 18, 2026 · 6 min read
When your electric bill nearly doubles in July, there is usually one culprit doing most of the damage: the air conditioner. In almost every Texas home it is the biggest single draw of the summer, and once you understand what it actually costs to keep running, the number at the bottom of your bill stops feeling like a mystery.
The short answer
A central AC pulls roughly 3,000-5,000 watts (about 3.5 kW on average) while the compressor runs. At ~14¢/kWh — a common Texas energy-charge example — that is roughly 45-50¢ per hour of run time. But it runs many hours a day in Texas heat, so cooling commonly adds about 900-1,500 kWh a month, or roughly $125-210. That is why summer bills nearly double. A window unit is far smaller at about 500-1,500 W.
What It Costs Per Hour — the Simple Math
The math is friendlier than the bill makes it look. Power draw times hours times your rate equals cost. A central system running at about 3.5 kilowatts, billed at roughly 14 cents per kilowatt-hour, costs a little under 50 cents for each hour the compressor is actually on. A window unit, drawing far less, lands closer to a handful of cents an hour. Here is the rough shape of it:
| Equipment | Rough draw | Approx. cost per running hour at ~14¢/kWh |
|---|---|---|
| Central AC (compressor on) | ~3,000-5,000 W (~3.5 kW avg) | ~45-50¢ |
| Window unit | ~500-1,500 W | ~7-21¢ |
Those are honest ballparks, not guarantees — your unit's size and efficiency shift the numbers. But the shape holds: per hour, air conditioning is cheap. It is the sheer number of hours that turns it into the largest line on a Texas summer bill.
Why Cooling Adds $125-210 in a Texas Month
Here is where the hours catch up with you. During a stretch of triple-digit afternoons, a central system can run for a large share of the day and keep cycling well into the night. Add that up and cooling commonly contributes roughly 900 to 1,500 kilowatt-hours in a peak month. At about 14 cents each, that is somewhere around $125 to $210 of your bill coming from the AC alone. It is the main reason a home that used maybe 1,000 kWh in a mild spring can push past 2,000 kWh in August — a jump we dig into in our guide on why Texas summer bills spike.
This is also why the U.S. Department of Energy and ENERGY STAR both flag cooling as roughly 40 to 60 percent of a summer electric bill in hot climates. If you have ever wondered what uses the most electricity in a Texas home, the answer in July is almost always the thing keeping you comfortable.
What Drives Your Cooling Cost Up or Down
Two homes on the same street can run wildly different cooling bills. The levers that decide it are the unit's size and SEER efficiency rating, how well the house is insulated and shaded, the condition of the ductwork, the thermostat setting, and the outdoor temperature the system is fighting. A shaded, well-sealed home with an efficient unit and a sensible setpoint sips energy compared with a sun-baked house leaking cold air through gaps and leaky ducts. Most of those factors are at least partly in your control.
A low cost per hour is not a low bill
It is tempting to look at 45-50 cents an hour and relax. Do not. In a Texas summer the compressor may run for a big chunk of every 24 hours, so multiply that modest hourly figure by the hours our climate demands and it becomes the largest thing on your statement. The way to win is to cut the hours, not just admire the rate.
The Biggest Levers to Cut the Cost
Four moves do most of the work. First, raise the thermostat a few degrees — every degree trims run time, and going a little warmer when you are home or asleep adds up over months; our guide on the best AC temperature for a Texas summer covers how far to push it comfortably. Second, service the unit and keep the filter clean so it runs at its rated efficiency instead of straining. Third, seal and insulate — sealed ducts, weatherstripping, and attic insulation stop the AC from fighting a losing battle against hot air leaking in. Fourth, shade the house so the sun is not baking your walls and roof all afternoon.
There is a fifth lever most people forget. Because every single cooling kilowatt-hour is billed at your effective rate, a cheaper plan lowers the entire cooling season at once — no new equipment, no lost comfort. The same 1,200 kWh of July cooling simply costs less. That is the quietest, fastest saving of them all.
Lower the cost of every cooling hour ⚡
You can trim run hours all summer, but the rate under every one of those hours matters just as much. Compare every plan in your ZIP at your real usage in under a minute.
Compare Plans Free →Common Questions
How much does it cost to run AC per hour in Texas?
A central air conditioner draws roughly 3,000 to 5,000 watts while the compressor is running — call it about 3.5 kW on average. At around 14 cents per kilowatt-hour (a common Texas energy-charge example), that works out to roughly 45 to 50 cents for every hour the unit actually runs. The catch is that in a Texas summer it runs many hours a day, so those small hourly numbers add up fast.
How much of my electricity bill is air conditioning?
In a Texas summer, cooling is usually the single largest slice — commonly about 40 to 60 percent of the bill, according to figures from the U.S. Department of Energy and ENERGY STAR. That is the main reason a home's bill can nearly double between a mild spring month and August. In winter, when the AC is mostly off, that slice shrinks dramatically.
Why is my AC so expensive to run in Texas?
Mostly because it runs so much. Triple-digit heat means the compressor cycles on for a large share of the day and night, and every one of those hours is billed at your rate. On top of the raw run time, a poorly insulated or unshaded house, leaky ductwork, an aging or dirty unit, and a low thermostat setting all make it work harder for the same comfort. The hourly cost looks modest; the hours are what make it expensive.
Does a bigger AC unit cost more to run?
Generally a larger unit draws more watts while running, so yes, it costs more per hour. But total cost depends on run time too — a right-sized, efficient unit that cools the space and shuts off can cost less over a month than a small, struggling unit that runs constantly. An oversized unit that short-cycles is not a bargain either. Matching the equipment to the home and keeping it serviced matters more than the raw size number.