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When the Houston heat won’t quit, neither will the HVAC specialists at 68 Degrees HVAC. The company’s mission is to provide seamless air conditioning services, a must-have for Houston residents.

The winter solstice, when the day gets the least amount of sunlight, is on Dec. 21 this year. That’s also when normal highs in Houston fall to the mid-60s and lows drop into the mid-40s.

Changing the temperature by 7 to 10 degrees for eight hours a day, in winter and summer, can save about 10% a year on heating and cooling, the department said. This step to save money and energy ...