Forum Discussion

Explorer

Jul 18, 2013

Roof Vents Open or Closed When Running A/C?

I very rarely run A/C since I spend most of my time in the dry southwest. Now that I'm located in Arkansas where temps and humidity are high I find that I'm running my A/C almost daily . My common sense tells me to leave the roof vents open at least a little to allow hot air to escape since the cooler air will remain at lower levels. However, in experimentation it seems to work a little better with them closed. What about you? Vents closed or open?

Seeking Advice

13 Replies

Community Alumni
Jul 18, 2013
Well the hot air should expell through the ac unit but I also leave the vents open just for additional fresh air. My vent have fans in them so leaving them open simply allows me to turn a fan on when needed for places like the bathroom and kitchen area.

If it's very hot and humid, I will sometimes close the vents.

I know that at home, we keep everything shut when the ac is on but we don't have vents there.
gatorcq
Explorer
Jul 18, 2013
Of course the AC works better with the vents closed. The AC is removing the humidity and you keep letting back in by opening the vents.
mlts22
Explorer II
Jul 18, 2013
Closed because it takes a bit to get the humidity out of the air, and why let hot, wet air back in.