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Re: air not cold
If you are always using it, yes it could be. The heat it produce helps in its normal wear and tear. Corrosion is one and dirt helps. Freon could stay in the system as long as it is not getting any break or hole.
If freon is out of the case. Unit not getting cold, the fault could be dirty air filtter, dirty exchanger, dirt in the system itself, or clog. And also you cannot negate it thermostat, could be its setting or actually faulty. And compressor fault.
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You have an air flow problems. Clean the outside condenser coil I use on half baking soda and one half joy soadp squirt this on the coil take a coil brush that you can buy at any hardware store. and go up and down on the coil. then take the water hose and squirt it down to clean the soap and dirt off, It this doesn't solve it you will need to clean the fan blower motor the squrrel cage but don't get the motor wet. Next you will need to clean the evaporator coil just take the coil brush and go up and down to clean. This should solve your problem, What kind of readings did you get on the low side and high side. You should have a 40 degree drop across the evapartor. And the high side should be the out side temp and 30 degrees. If you have any questions you can email me at crislsparks@gmail .com. What kind of freon does it the unit take. It will tell you on the nameplate on the outside unit.
Unit works good? Is the compressor coming on but not blowing cold air? If the compressor is running but not cooling, then the main issue is usually with cleanliness of the condenser. Wash it out if this is the case. If the compressor is not coming on, multiple problems could be the reason.
These units do not have service ports as a normal AC does. If you have lost freon then there is a leak in the system somewhere as they are sealed. The process for recharging a rooftop unit is usually expensive and not fail safe. I would recommend a new unit if a leak is discovered.