Are these pretty much non-existent? I've never used one before but I'm starting to think now is a good time to start. I came home today and found my g/f with all the windows up and the door to the patio wide open. Immediately I checked my desktop and found the temp inside at a warm 79.8 degrees. Would an Oust fan help keep the temps down inside? There's no point in argueing with her about the a/c. To her 78 degrees is too cold. If an Oust fan would help...Where do I get my hands on a few?