I don't have any experience with DeSantis, but I would buy a Carrier unit from Munn's. I think they are a larger company and will be more able to respond to repairs. The new unit will come with a 5 to 10 year warranty, so it is important to have a company who will be able to quickly respond when you need a repair. There are many Carrier units in The Villages installed by Munn's, so parts and service should not be an issue. I would buy the basic, single stage unit, not one of those fancy 2-stage or variable speed models. They are not worth the money and the availability of parts can be a problem. Also, if you suspect that your current unit may be undersized, you should have your house evaluated to see if a slightly larger unit would work better. Good luck.
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