rand_alpha19@moist.catsweat.com 3 months ago
The most efficient way is to force cold air into the space while also forcing hot air out. The best way to do this is to have maximum airflow from one end of the house to the other, often by opening all of your windows and using multiple fans to direct the air. Shouldn't really matter if the fan is outside or inside the window; an airtight seal around the fan should get you good results either way.