Hi all- long time lurker, first time registered and posting.
Need your advice on whether to spring for an inverter model of mini-split which will be used for cool only. 1950’s colonial house has central a/c (2 separate compressors, one up and one down) but a 20x20 cathedral ceiling family room extension on a slab with southern exposure is consistently 5-8 degrees hotter than the rest of the house. It doesn’t help that it’s the last duct on the run, with the compressor 40 feet away. Also, one 20 ft. wall is open to the kitchen (and the hot lights and oven).
The three contractors I have had over all recommend a cool-only mini-split (no need for heat as the room is fin baseboard on its own zone) but they say no need to go with an inverter model, as the unit will only cool, not heat.
As this is the most used room in the house and the a/c will be on more than any of the central a/c units, I want to make the right choice in terms of both comfort and energy efficiency.
Would you recommend upgrading to an inverter model? The Mits inverter models start at 15,000 BTU, so oversizing may be an issue.