So i just installed a 12,500 btu window style A/C. I put a rubbermaid tub around the sleeve and taped it and have it exhausting with a 435 CFM 6"inline outside. I first ran it without the hole in the top and the condenser would kick off after about 10min and it was getting really hot. After i cut the extra hole in the top it will run for about 1 to 2 hours then i can hear the condenser kick off for about 10min and it will blow warm air into the room. Do i need to get a bigger inline? or maybe install 8inch ducting with a reducer? Or is this normal for them to kick off and then back on? I need to solve this problem asap the summers here can reach 120F. The ducting run is about 15 feet total in length also.
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