I live in Seattle, where it rarely gets hot enough to justify AC in the home. However, we've had a few heat spells in recent summers that can drive temperatures in our older, poorly venhilated home into the mid-90's. Last year we purchased 2 of these mid-size fans and I can not believe how well they circulate the air through the second floor of the home and how quickly they can cool down the house when the sun goes down. They are powerful fans and I love how they don't take up much space.