As of late September 2026, the powered fan in my Houston attic still clicks on every hot afternoon, the way it has every summer I’ve lived here. My logic was simple: hot air collects up there, the fan throws it out through the roof, and the AC downstairs gets an easier job and a smaller bill.
The heat part is real. CenterPoint Energy notes that “when temperatures soar past 100 degrees in the Greater Houston area, your attic may reach 150 degrees or hotter.” But the utility’s answer to that heat isn’t a fan. On the same page it says that without proper insulation, the heat radiates down into your living spaces and makes the air conditioner work harder, and it cites the ENERGY STAR recommendation of R-38 to R-60 attic insulation for Houston’s climate. Here in Texas, with an attic that stays hot for months, I’d been fighting the right problem with the wrong tool.
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What ENERGY STAR says
ENERGY STAR’s guide to attic ventilation spells out what happens in a lot of houses: “if your attic has blocked soffit vents and is not well-sealed from the rest of the house, attic fans will suck cool conditioned air up out of the house and into the attic.” It says that uses more energy, makes your air conditioner work harder and increases your summer utility bill…