BISMARCK, ND (KXNET) — It’s another hot day in North Dakota, with some areas hitting the 90s, and older air conditioners are struggling to keep up.

The heat is part of a massive system covering much of the U.S. The National Weather Service says millions are under heat advisories, with temperatures in some areas climbing past 110 degrees. In North Dakota, the heat isn’t that extreme, but it’s still putting strain on cooling systems and pushing up electricity use.

Experts warn that outdated HVAC units can run constantly without fully cooling a space. That drives up power bills and shortens the system’s lifespan. It can also make indoor air unhealthy, especially when windows stay closed for days. Limited ventilation can raise carbon dioxide levels, which can leave people feeling tired, caus

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