What you may be seeing are passive vents. For example, my house has 3 round vents on the roof but there isn't a fan in them.
Power ventilators have been researched by some of the energy labs. The bottom line is they may actually increase your electric bill by sucking air-conditioned air into the attic. Also, the physics of heat transfer in the attic is not what you might think. Heat is transferred by convection, conduction, and radiation. It turns out that radiative transfer from the hot roof sheathing is the primary mechanism for heat transfer in your attic. Unless you address that, nothing else will make much of a difference. Spray foam insulation on the underside of the roof sheathing is effective. A radiant barrier is another option. I have had power ventilators in a previous home (before I researched how ineffective they are) - they didn't help.
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Originally Posted by davefin
Coming from NJ. Purchasing new in Hillsborough section. While driving around the Villages during my last trip here I note that many homed have power vents installed in the roofs. Some had as many as four vents. Could someone inform me if they are worth installing. Do they really remove heat from the home? Are the worth the money?
Thank you in advance for answers to my question. Looking forward to living here. Closing on September 19.
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