Posted By Ringo on 07/17/2008 6:28 PM Why do all my AC vents blow at the windows? Just got into my new home and wondered why the air blows at the windows? You would think that it would take longer to cool your house if the AC blows at the hot window. I may be wrong but if someone could explain that that would be great. In a double pain window there are 2 pieces of glass with air in-between, trapped air is the best insulator around. If the inside pane gets hot, you will have issues with heat actually transferring inside on a faster pace then if the pane was cool since the air in your room is not trapped, so keeping it cool will keep it at bay in theory. The only issue with this is blinds though, the blinds act as a barrier from your room to the window, so the window will get warm. But photons will produce more heat then proximity so its better to have blinds. So in reality the best case scenario is to have inside pane hung blinds and the AC hitting the window. The other thing that having it hitting the window is stopping heat traps, once you get a heat trap it will spill into your ceiling pretty fast. Its sort of like a lava lamp, not sure I am explaining it. In the end, when in doubt test it out. Go get a IR temp reader and try it for a week and take various temps throughout the room, at least you get a new toy out of the deal, and you would be amazed on how handy those things are. BTW I am not a HVAC specialist, I am only giving knowledge from industrial enviromental settings. |