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Let’s talk numbers. Most homeowners have no idea what the cost to run AC in Texas actually is, or how much of that cost comes down to being on the wrong electricity plan. Here’s the real math.
Key takeaways
- A typical 3-ton central AC can use around 30 to 35 kWh on a hot day.
- Over a Texas summer, that’s often $400 to $600+ just for cooling.
- Your rate per kWh changes the total as much as your thermostat does.
- Maintenance, sealing leaks and smarter thermostat settings cut the rest.
What running AC in Texas actually costs
Many Texas homes have a 3- to 5-ton central AC. On a hot day, a 3-ton system drawing about 3.5 kW for 10 hours uses roughly 35 kWh. Here’s what that looks like over a 90-day summer at different all-in rates:
| All-in rate | Cost per day | 90-day summer |
|---|---|---|
| 12¢ per kWh | about $4.20 | about $378 |
| 15¢ per kWh | about $5.25 | about $473 |
| 18¢ per kWh | about $6.30 | about $567 |
Estimates for illustration. Your system size, efficiency, insulation and thermostat setting all change the numbers.
Same house, same AC, same habits, and nearly a $200 difference just from the rate. Larger homes and older systems push the numbers higher.
The hidden cost: your electricity rate
Two households with identical AC units and habits can have very different bills because one is on a better plan. And summer is when plan design matters most: high usage multiplies every cent of your rate, and some plans price differently at high usage levels. Check the 2,000 kWh price on your EFL.
5 ways to reduce your AC costs
1. Get an AC tune-up
A dirty or poorly maintained system has to work harder. An annual tune-up keeps it efficient and catches problems before they become a 100°F emergency.
2. Change your air filter regularly
A clogged filter restricts airflow and makes your AC run longer. In a Texas summer, check it monthly. It’s a $10 fix most people skip.
3. Seal air leaks
Check around windows, doors, attic hatches and ducts. Cool air leaking out means more runtime. Weatherstripping, caulk and duct mastic are cheap fixes. Use our home energy efficiency checklist.
4. Use a smart or programmable thermostat
Set it warmer while you’re away at work. Raising it several degrees for 8 hours a day adds up over a whole summer.
5. Get a better electricity plan
It’s the biggest lever and the easiest to pull. Watt Panda reviews your bill, compares plans for your usage and handles the switch, at no cost to you.
Helpful official resources: U.S. Department of Energy: Energy Saver · ENERGY STAR
Stop overpaying. Send us one bill.
We read the fine print, compare plans from our network of Texas electricity providers, handle the switch, and keep an eye on your renewal date. It’s free to you.
- $0 to you, ever
- No monthly membership
- Real people in Houston
Frequently asked questions
How much does it cost to run central AC per hour in Texas?
A 3-ton system using about 3.5 kW costs roughly 40¢ to 65¢ per hour at all-in rates of 12¢ to 18¢ per kWh.
What temperature should I set my AC to in a Texas summer?
78°F while you’re home is a common energy-saving target, with higher settings when you’re away. Ceiling fans help it feel cooler.
Is it cheaper to leave the AC on all day?
Usually it’s cheaper to set the thermostat higher while you’re gone rather than run it at full cooling all day. A smart thermostat can pre-cool before you get home.
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