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Should a central AC be run periodically?
I'm not really one for A/C but my house has two entirely separate zones of it, one for each floor. I've used one of the zones for about 15 hours total this summer and not turned on the other zone at all. That said, they are fairly new installs (about 4 years old, put in by the previous owner) and I'd like to keep them operable.
So with that said, is there a reason to run a zone periodically? Is there annual service which should be done to a system which isn't used or only used very infrequently?