Should you leave your air conditioner on all day?

(26 Aug 2025)
RESTRICTION SUMMARY:

ASSOCIATED PRESS
New York City – 25 August 2025
1. Various of air conditioning window unit

ASSOCIATED PRESS
Tempe, Arizona – 21 August 2025
2. SOUNDBITE (English) Patrick Phelan, Mechanical and aerospace engineering professor, Arizona State University:
“The typical number we use is 1 degree Fahrenheit adjustment, or increase in the thermostat setpoint, gives you about a 3% savings in your cooling costs. Alright. And that’s a number that comes out of something called the Residential Energy Consumption Survey.”

ASSOCIATED PRESS
Veracruz, Mexico – 15 June 2024
3. Sun seen through palm tree in extreme heat
4. Various of 82-year-old woman trying to cool down at her home in downtown Veracruz
5. People walking across hot square

ASSOCIATED PRESS
Tempe, Arizona – 21 August 2025
6. SOUNDBITE (English) Patrick Phelan, Mechanical and aerospace engineering professor, Arizona State University:
“You’re going from just an ordinary manual thermostat to installing a smart one like a Nest, the you can expect something like 10% savings, and that’s really realized through this temperature setback. In other words, it’s learning that when you’re not at home to adjust — to raise the temperature.”

ASSOCIATED PRESS
New York – 25 August 2025
7. Hand adjusting thermostat on wall for central air
Central air conditioning unit on wall

ASSOCIATED PRESS
Tempe, Arizona – 21 August 2025
8. SOUNDBITE (English) Patrick Phelan, Mechanical engineering and aerospace professor, Arizona State University:
“So when your air conditioner is working, it’s condensing the water out of the air inside of your house, so that’s really important as well in terms of comfort, right? So that’s another reason not to just shut off your air conditioner if you can help it.”

ASSOCIATED PRESS
Sienna Plantation, Texas – September 4, 2017
9. Mold on wall in home

ASSOCIATED PRESS
Rome – 25 July 2023
10. Client looking at air conditioners on display

ASSOCIATED PRESS
Opa-locka, Florida – 13 April 2024
11. View of palm trees over building

ASSOCIATED PRESS
Tempe, Arizona – 21 August 2025
SOUNDBITE (English) Patrick Phelan, Mechanical engineering professor, Arizona State University:
12. “So, you know, you kind of want to be in that sweet spot. So temperature-wise, it’s typically something between 75 and 76, something like that, is considered optimal.

ASSOCIATED PRESS
New York – 25 August 2025
13. Wide lowering blinds
14. Wide opening window

(AP Video by Kiki Sideris)

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STORYLINE:
Having air conditioning at home is a luxury that keeps people comfortable during the hottest months of the year, and it’s debated whether the AC should stay blasting or be turned off when people head to work during the day.

Some swear that turning off the AC when they’re gone for a few hours is the most energy-efficient, costing-saving method. Others say it’s better to leave it running continuously, preventing the system from straining to rapidly cool the house down after the home has gotten warmer throughout the day.

Three experts interviewed by The Associated Press agreed that setting the thermostat a few degrees higher than normal while you’re away is generally the best way to balance energy efficiency against comfort and humidity.

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