True. Roof top A/Cs have a sealed refrigerant system. Chassis A/C has service ports and can be serviced. You should pull the cover on the roof top A/Cs at least every year and check for debris. It is amazing what finds its way into the A/C (cotton wood seeds, muddobbers, paper wasp, leaves, etc).
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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