We are currently designing an approx 1300sf 36'x24' completely SIP constructed 1st floor walls and roof and ICF basement (1/2 conditioned) home w/a small 10'x14' open loft area. It is being built outside Johnson City, TN elev approx 1800'. The HVAC needs should be minimal I would think. I am starting to lean more toward using 2-3 mini-splits in basement, master suite and main kitchen/living room and loft areas and an on-demand water heater. I want zone controlled temperatures. There is no sense to heat a basement when we are hanging out and sleeping in a 14'x14' main floor bedroom for 10-12hrs a night. Or...with such a small HVAC demand need, would it be just as efficient and maybe more cost effective to go with a small heat pump and heat pump water heater system since we will have plenty of ICF insulated space in the unfinished portion of the basement. Therefore, the duct work, being in an insulated space and centrally located will be very minimal. The house is currently being designed to have duct work between floors but again, I am starting to lean toward mini-splits. Again, I think zone temperatures make sense so if we did go with a heat pump system, what is the best way of transferring cooler basement air to the loft and /or warmer wood stove or heated air to the basement? The down stairs will be open but there will be a door going into the basement room. Initial cost is a factor and with such a small, tight envelope, efficient windows and therefore minimal HVAC needs, I would think a big cost difference could take a number of years to recoup. Thanks! In advance for any suggestions or input.
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