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Hi, when you are running it in the cooling mode, leave the exhaust open to remove the condenser hot air. If you want to run just the fan to circulate the air you can close it. Sincerely, Shastalaker7 A/C, Heating, & Refrigeration Contractor
is it a split system? majority of problems, lets say 95% occur during install, u may have a leak! A pinhole at that, but maybe installer missed it, your out of labor warranty, call a 3rd party contractor and have them inspect it!
Check air temp out vent should be approx 20 degrees colder than room temp if it is your unit is too small for the amount of space you are cooling.Rule of thumb 1 ton(12,000btu's) for every 400 sq ft of uninsulated space
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