Gary7, when I was doing my research for garage door vents, all of the vendors that had vents were for the bottom of the door, TO LET WATER OUT!!! I actually found very few garage door vendors with any form of vent to replace the glass windows. My opinion, it does not matter if the vents are high or low, as the outside air is all the same temperature. I also figured if I used the existing window locations, less chance of complaints, and more protection from existing overhang. My total cost was around $100 for the supplies, and several hours cutting the plastic, installing the vent on the plastic, sealing, and then installing the assembly in place of the glass.
Hope this helps.
Oh by the way, several neighbors mentioned how much cooler our garage is.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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