Circuit boards are different from old AC unit to new ones. You also have to replace thermostat to the new style so it matches new circuit boards. Its tricky but it can be done. I had mind done as I wasn't going to try lifting the old one down. and the new one up.
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Walt and Judy
2019 Mobile Suites 36RS3 #396674
2022 GMC Sierra Denali 3500 DRW 4WD
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