For the average old window what is the maximum weight air condition you should have installed without any support brackets beside screwing in the window frame from the inside? For example up to 50 pounds ok? 100 pounds risking it?

  • Nobody worries about this. Any commercially available unit will work in any window in a structure with anything approaching standard quality construction. If you have some non standard construction you could put braces to the wall or in a first floor window a post to the ground. I once had a 12 kBTU/h window unit in a window in the middle of a long side of a mobile home and I did put a post under the end of the unit. – Jim Stewart Jun 16 '19 at 18:04
  • Does your unit come with braces supporting the unit to the outside wall? – Jim Stewart Jun 16 '19 at 18:11
  • @jim I have a 40 pound air condition unit and was looking to replace it with an 80 pound unit but was having second thoughts because of potentially breaking my window and making it more difficult to take out and clean. So to just get another 40 pound unit – CodeCamper Jun 16 '19 at 18:37
  • A std window should have no problem with an 80 lb window unit. – Jim Stewart Jun 16 '19 at 19:10
  • @jim without any supports just with the 2 screws on the side? – CodeCamper Jun 16 '19 at 19:18

100 pounds is nothing for a window frame. Now if you don't have it mounted right you could break, crack or put stress the bottom of the actual window unit. This isn't a question of weight though, it is a question of how balanced it is and movement.

Is a 100 pound vs 50 pound AC unit more likely to have install issues... probably.

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