the-best-thermostat-setting-for-a-heat-waveplus-how-to-stay-cool-without-overworking-your-ac
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The Best Thermostat Setting for a Heat Wave. How to Stay Cool Without Overworking Your AC

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When extreme heat hits, it’s tempting to crank the air conditioning as low as it will go. But while that might offer short-term relief, it can lead to sky-high energy bills and put unnecessary strain on your cooling system. So, what temperature should you set your thermostat to during a heat wave?

We spoke with industry experts and rounded up smart strategies to help you stay safe, comfortable, and energy-efficient when temperatures soar.

What to Set Your Thermostat to During a Heat Wave

According to energy experts and the U.S. Department of Energy, the sweet spot is 78°F (26°C) when you’re home and need cooling. If you can, bump it up to 82°F when you’re sleeping and 85°F when you’re away. These settings help reduce the load on your AC, which can prevent breakdowns during critical times, and keep energy bills from skyrocketing.

When to Adjust Your Thermostat Lower

“Seventy-eight degrees creates the optimal balance between comfort and efficiency. Seventy-eight degrees may be warm for many people, but it is the standard recommendation to stay comfortable and be efficient during the summer months,” says Lane Dixon, Vice President of Operations at Aire Serv.

If you have vulnerable household members, like infants, older adults, or pets, you may need to keep the thermostat slightly cooler. In these cases, 76°F may offer a more comfortable balance between safety and savings.

It’s also helpful to use smart thermostats that learn your preferences and adjust automatically, especially during peak demand times.

What to Do if Your AC Can’t Keep Up

Keeping your air conditioner running smoothly during extreme heat isn’t just about comfort—it can help you avoid breakdowns and surprise repair bills. John McGaughey, vice president of sales at AUX AIR USA, shares several practical ways homeowners can help their cooling systems perform at their best this summer.

Replace Your Air Filter Regularly

“A dirty filter is one of the most common reasons systems underperform,” McGaughey explains. He advises checking the filter every month during heavy use and replacing it as needed (usually every one to three months.)

Keep the Sunlight Out

Direct sun exposure, especially on south- and west-facing windows, can dramatically increase indoor temperatures. To prevent excess sun from streaming through windows, consider adding blackout or dark-colored curtains and blinds.

Time Your Appliance Use Wisely

Large household appliances, like ovens, stovetops, and dryers, can heat up your living space fast. Use these in the early mornings or evenings when outdoor temperatures are lower.

Use Fans to Improve Comfort

Ceiling or box fans don’t cool the air, but they can help you feel cooler by circulating air across your skin and aiding in evaporation.

Check Your Outdoor AC Unit

The outdoor unit expels the heat your AC system pulls from inside. Keeping the area clear and occasionally rinsing the unit with a hose (while it’s off) can go a long way in improving efficiency.

If none of these steps help, it may be time to call in an HVAC technician, especially if you hear unusual noises, smell musty odors, or see ice buildup on your system.

DIY AC Fixes

Before you call in the pros, try these expert-backed maintenance tips that can improve your air conditioner’s performance—and might even help you avoid a costly repair visit, according to JustAnswer HVAC Expert Randy Huckstadt.

Rinse your condenser coil. The HVAC expert first addresses rinsing your condenser coil with fresh water.

“Dirty condensers do not allow you to reject the heat from inside the house that the refrigerant absorbed in the evaporator,” he explains.

Rinse your evaporator coil. If you can safely access it, he recommends rinsing the evaporator coil as well. He says that you cannot absorb the heat in the house if your coil is dirty.

Replace your air filter. Plugged air filters prevent quality airflow, which reduces the capacity of the AC system. Swapping in a clean filter is one of the easiest ways to keep your system working properly.

And if your condenser fan suddenly stops working, don’t panic—Huckstadt offers a clever temporary fix. He says you can use a small shower sprinkler to spray the condenser until a repair tech arrives. Water will take the place of a failed condenser fan.

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