Elbert Yazzie adjusts his air conditioning unit in Tuba City, Ariz., in 2025.

Across the U.S., it’s a hot summer, and electricity prices are high. Various public officials and corporate websites suggest people set their thermostats to 78 degrees Fahrenheit (25.6 degrees Celsius), or even 81 F (27.2 C), as a way to stay relatively cool without breaking the bank. But as someone who studies energy costs, I know from both personal and professional experience that it’s not that simple.

The summer after my daughter’s first birthday, she began vomiting in the middle of the night and small bumps covered her chest. I thought it was the blueberries we’d given her. My husband and I cut out acidic foods and changed her milk. At the time, we often kept our thermostat set to 79 F (26.1 C). Before becoming parents, that setting kept the summer electric bill below US$200. We would sleep without blankets and take cold showers like I had in graduate school.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.

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