South Carolina

It could feel like 110 degrees in SC this week. Here’s where to set your thermostat

South Carolina is really feeling the heat now.

The National Weather Service recently issued heat advisories across the state. Heat indexes could reach between 105 degrees and 110 degrees or even higher in the afternoon over the next few days.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors,” the NWS states.

A chart showing projected heat indexes for areas of South Carolina.
A chart showing projected heat indexes for areas of South Carolina. screenshot Courtesy of the National Weather Service

Drinking water and staying out of the sun is fairly self explanatory, but what about air conditioning?

What’s the best temperature to set your thermostat to during times like this?

Recommended thermostat setting

The U.S. Department of Energy recommends setting your air conditioner to 78 degrees during the summer. The idea is that you’ll save 10% on your power bill for every degree you go above 78 degrees. Otherwise, you’ll spend 10% for every degree you go below 78 degrees.

Staying comfortable

Carolina Comfort Inc., a Columbia-based HVAC company, notes that 78 degrees can still feel muggy, particularly in places like the Midlands because of the high humidity.

“This is because the heating and cooling system simply will not run long enough to pull the humidity in the house down below 50% relative humidity, which is ideal for most people,” the company’s website states.

To counteract that feeling, the company suggests also running ceiling fans.

“By running the ceiling fans in your home, you will move the cool air around; also, the air movement will help eliminate hot and cold spots that can be present in the home,” the website states.

Energy saving tips

Dominion Energy has several tips to help South Carolinians save money on their power bills over the summer.

  • Check air filters monthly and change when dirty
  • Periodically check your ductwork for leaks or tears
  • Have your central heating and cooling system serviced annually
  • Upgrade your attic insulation to a minimum of R-38 (12-14 inches)
  • Caulk, seal and weather-strip around all seams, cracks and openings
  • Install a door sweep to seal the gap between the bottom of your door and the threshold

This story was originally published August 14, 2023 at 9:40 AM.

Patrick McCreless
The State
Patrick McCreless is the Southeast service journalism editor for McClatchy, who leads and edits a team of six reporters in South Carolina, Georgia and Mississippi. The team writes about trending news of the day and topics that help readers in their daily lives and better informs them about their communities. He attended Jacksonville State University in Alabama and grew up in Tuscaloosa, AL.
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