Stephanie Tate couldn’t figure it out. After three years of living in her new Illinois home, her winter energy costs last year suddenly spiked to $400 per month.

She had three different technicians come to look at her HVAC system and furnace, but nothing was wrong with it. She had her home insulation inspected and found no issues. She installed new, energy efficient windows to stop cold air from leaking into the house.

“It still didn’t make a dent,” she said.

In the summer, her bills were even higher, driven by the cost of the electricity needed to run her air conditioner. Tate tried to use her heat and cooling sparingly in hot and cold months.

“In the winter, I keep my heat well below 68 — and it gets cold here, so you just bundle up,” Tate said. “In the summer, my AC is at 75. I’m de

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