Why August Is the Toughest Month for Your Bill
August is typically the peak of summer stress on both your air conditioner and your electric bill in North Texas. Triple-digit afternoons are common, and unlike June or July, the ground and attic spaces have had all summer to absorb heat, meaning your system often has to work harder just to maintain the same indoor temperature it managed easily a couple months earlier.
This is exactly the point in the season when small thermostat adjustments can make the biggest difference, both in comfort and in cost. The good news is you don't need to sacrifice comfort to see savings — you just need a strategy that matches how North Texas summers actually behave.
It's not unusual for a DFW home's cooling costs to be 20 to 30 percent higher in August than in June, even with identical thermostat habits, simply because the system has to work against baked-in heat from the ground, roof, and attic insulation. That's exactly why the settings and habits below matter more this month than at almost any other point in the year.
What Temperature Should You Actually Set?
A commonly recommended setting for energy savings while people are home is around 78 degrees, which balances comfort with reasonable energy use. That said, comfort is personal, and the "right" number for your household depends on factors like humidity levels, how many people are home during the day, and whether ceiling fans are helping circulate air.
The bigger opportunity for savings usually isn't the exact number you pick while you're home — it's what you do with the thermostat while no one is there.
Humidity plays a role here too. North Texas summers combine high heat with meaningful humidity, and a home that feels sticky at 75 degrees can feel perfectly comfortable at 78 if the air conditioner is doing its job of pulling moisture out of the air along with the heat. If 78 feels too warm even with good humidity control, check that your system's airflow and filter are in good shape before assuming you simply need a lower setpoint.
The Truth About Bigger Temperature Swings
A lot of homeowners assume that letting the house get significantly warmer during the day and then cranking the AC down when they get home will save the most money. In practice, this can backfire, especially in a Texas August. If you let your home climb to 85 degrees while you're at work, your system may have to run at full capacity for hours once you get home just to bring the temperature back down, and it also has to work against a hotter attic and walls that have absorbed heat all day.
A more moderate setback — a few degrees higher than your comfort setting rather than a dramatic swing — tends to strike a better balance between energy savings and not overworking your system when you return home. Every home is a little different, so this is worth testing over a few weeks to see what works best for your specific house.
As a starting point, many DFW homeowners find a 4-to-6-degree setback while away strikes a reasonable balance — enough to meaningfully cut runtime during empty hours without asking the system to fight an 85-plus-degree house once everyone's back. Homes with poor attic insulation or older, leakier ductwork may need to keep the setback smaller, since those homes heat up faster during the day and take longer to recover in the evening.
Building a Smarter Daily Schedule
A smart or programmable thermostat makes this kind of strategy much easier to manage consistently. Instead of remembering to adjust the temperature manually every time you leave or return, a schedule can automatically shift the setting a few degrees warmer during work hours and bring it back down shortly before you're expected home, so the house is comfortable by the time you walk in rather than starting the cooling process from scratch.
Many smart thermostats also let you set different schedules for weekdays versus weekends, which is useful for households with routines that change depending on the day. If you're still using a basic manual thermostat, upgrading is one of the more cost-effective changes you can make — our residential air conditioning team can help you pick a model that fits your home and routine.
Don't Overlook the Fan Setting
Most thermostats have a fan setting of "auto" or "on." Setting it to "auto" is almost always the better choice for saving energy, since "on" keeps the blower running continuously even when the system isn't actively cooling, which uses extra electricity without much comfort benefit.
Ceiling fans, on the other hand, are worth using generously in August. They don't lower the actual temperature of a room, but the airflow they create can make a space feel several degrees cooler, letting you raise your thermostat setting slightly without sacrificing comfort. Just remember to turn them off in empty rooms — a fan only helps when it's cooling the people actually in the room.
Why a Well-Maintained System Makes Every Setting More Effective
Even the smartest thermostat schedule can only do so much if the equipment behind it isn't working properly. A system with a dirty filter, low refrigerant, or a condenser coil caked in dust will use more energy to hit any given setpoint, no matter how well the schedule is designed. In practice, this means two identical-looking August electric bills can hide very different stories: one home running efficient equipment on a smart schedule, and another compensating for a struggling system by leaning on aggressive temperature settings that still don't quite keep up.
Before assuming your thermostat strategy needs more adjustment, it's worth confirming the basics are covered: a clean filter, clear airflow around the outdoor unit, and a system that's had a seasonal check within the last year. Our Comfort Maintenance Plan is built around catching exactly these kinds of efficiency drains twice a year, so your thermostat settings are working with the system rather than compensating for it.
What Actually Works in DFW Homes
After years of visiting homes across the Metroplex during peak summer, we've noticed that the households with the lowest August bills usually aren't the ones with the most extreme thermostat settings — they're the ones with the most consistent ones. Homes that use a modest, well-planned schedule tend to see steadier, lower energy use than homes that swing dramatically between very warm and very cool.
We've also seen that a lot of "the AC just can't keep up" complaints in August actually trace back to thermostat settings that ask too much of the system at once, rather than an equipment problem. Before assuming something's broken, it's worth reviewing your schedule and settings — sometimes a quick adjustment resolves the issue without any repair needed at all.
Putting It All Together
A few practical takeaways for the rest of this August:
- Set your comfort temperature around 78 degrees, adjusting to what feels right for your household
- Use a moderate setback while you're away rather than an extreme one
- Let a smart thermostat handle daily scheduling automatically
- Keep the fan setting on "auto," not "on"
- Use ceiling fans in occupied rooms to feel cooler without lowering the thermostat
If your system still seems to struggle even with smart settings in place, it may be worth having it looked at. Call us at 972-446-2665, or explore our maintenance plan to make sure your equipment is running as efficiently as your thermostat strategy allows.
Spencer Air Conditioning & Heating — Serving DFW Since 1960. License TACLA115636C