If you've ever opened your CPS Energy bill in August and done a double-take, you're not imagining things. San Antonio homeowners pay some of the highest summer electric bills in the country — not because our rates are high, but because our cooling season never seems to end.
What AC Actually Costs to Run in San Antonio
A standard 3-ton central AC unit runs at roughly 3,500 watts (3.5 kW). At CPS Energy's rate of about $0.13 per kWh, running your AC for 10 hours a day costs approximately $137 per month. From May through October, that's a conservative $575-$700 in AC costs alone.
The average residential electric bill in San Antonio during summer runs $180-$200 per month. Your AC is responsible for 50-60% of that.
5 Things Silently Driving Your AC Bill Up
1. An Aging System Running Inefficiently — An old low-SEER system uses 30-50% more electricity. If your system is over 12 years old, that inefficiency is baked into every bill.
2. A Dirty Filter Choking Your Airflow — Dirty filters increase AC costs by 15-20%. That's $25-$35 a month for something a $10 filter swap can fix.
3. Poor Insulation Letting Heat Back In — Poor insulation can add 20-40% to cooling costs.
4. Setting the Thermostat Too Low — Every degree below 78 adds roughly 10% to your cooling cost.
5. Skipping Annual Maintenance — Typically costs you 15-25% in extra energy use.
SEER and SEER2 Ratings — What They Actually Mean
What Upgrades Actually Save — Real Numbers
Real example: A customer in Helotes went from $180/month to $95/month after a new high-efficiency system and smart thermostat — $85/month saved, over $1,000 back every year.
FAQ
How much does it cost to run AC all day in San Antonio?
Roughly $11-$13 per day for a standard 3-ton unit at current CPS Energy rates.
What temperature should I set my thermostat in summer?
78 when home, 85 when away. Every degree lower adds about 10% to your AC costs.
What's the single fastest thing I can do to lower my AC bill right now?
Change your air filter if you haven't in the last 30 days. It can cut AC costs by 15-20% immediately.
Call us at (210) 535-1515 or book online.
