first time posting a question. last year i purchased a 12,500BTU window mount air conditioner. needed to resize electrical outlet and rearrange breaker box to accomodate two pole 20-20amp breaker switch. the window is unfortunately wider than recommended for this AC unit. any ideas on how to support to structure. the windows are aluminum replacements and the surrounding structure is brick and stucco w/ lathe/plaster interior. I temp installed two years ago for 1 season and flexed the bottom of the window frame.