The issue with fans through the roof of your house is they create a slight vacuum in the attic and replacement air can come through the soffits as well as from the air conditioned space in your house through recessed lighting and other imperfect seals. In addition, the primary mechanism of heat transfer in the attic is by radiative transfer from the underside of the roof sheathing. Attic ventilators won't address this primary method of heat transfer. This has been objectively researched. Spray foam insulation on the underside of the roof sheathing will result in a cool attic because if dramatically reduces radiative transfer to the rest of the attic. I had this in a previous home.
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Originally Posted by Sandtrap328
I have an attic fan that is solar powered and therefore has no energy cost. It was installed by Solar Guys. The attic fan is a good investment and I would recommend a solar fan.
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