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I'm evaluating ideas for replacing the two 23 year old 4 ton 12 SEER R22 package heat pumps sitting on my roof. They're still working okay, but will need to be replaced eventually. When that happens, I would rather not replace them with rooftop package units (mainly because of maintenance...

I've recently (9 months ago) purchased a home with two 24 year old 14 SEER Ruud RJMA 4-Ton R22 package heat pumps running on 240VAC on the roof. Even though they lack state of the art efficiency, thus far (thru most of a winter and most of a summer) they seem to be performing well. As a...