This fan is amazing. The way my house is set up is horrible. It's like a U shape and my bedroom is in the back. No matter what we do it's either a million degrees or freezing cold.  I have never been able to keep a controll on the temp just in my room. I was so excited to find this fan. Not only does it suck in cool air from outside it also sucks out hot air from inside. It's super easy to switch from suck to blow. It didn't quite fit my window with the screen on but fit perfectly try when we removed it. It has helped so much.