[Don Ro]

Thanks for all your replies...I appreciate the participation.
I will restate what I've already written:
- ...thinking of a thermostatically controlled gable fan.
- - House has gable vents on both ends...one is on the attached garage.
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As is, my house has two gable vents, one at one end of the house and the other at the opposite end - which is the existing garage gable vent.
At the side of the existing garage where the garage gable now exists, I will be using that wall and adding another 20' wide attached garage - three more walls for the new attached garage.
An existing outside garage window will be removed and a set of doors will be installed to allow access from the existing garage to the newly attached garage.
So, in the end, there will be an attic air corridor from the end of the newly attached garage all the way through the house attic and to the other end of the house...the house's existing gable vent.

Eventually, there will be a garage gable vent > at the garage attic > through the house attic > to the house gable vent on the other side of the house.
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What I thought about doing is installing a gable fan at the new garage gable vent.
Blowing the hot attic air through the garage attic and out the other end, which is the existing house gable vent.
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So if a breeze is optimal, and a female cat in heat hangs out at the new garage's gable vent, a horny Tom cat hanging out at the house's gable vent on the other end of the house will become aroused.
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Sorry if I was not clear.