Confusing, the title says heat pump but the 1st paragraph states AC. You always want to use a heat pump, I’ve used them since the early 80’s. I have both of these heat pumps in my house; the Mits for the lanai, Carrier for the whole house.
The heat pumps TV installs in the newer houses are undersized for the sq footage of the house, by at least 1/2 ton and the Seer is on the lower side. But there is a reason for this madness of undersizing the heat pump and that’s because they (hvac dealer consensus) want the heat pump to run longer to get rid of the humidity. So if the heat pump doesn’t need to run that often, you build more humidity in the house. I also know that you can control the humidity by the ecobee.
When I enclosed our lanai, I looked at replacing our carrier to a larger sized unit based on our sq footage and ‘zoning’ off certain rooms. Every dealer I talked too recommended keeping the carrier and getting a mini split for the lanai. This route has worked great and has actually cut down on our electric bill at the same time it was 1/2 the cost of swapping out the carrier.
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