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Hydronic radiant heating subtleties
We are in the middle of a new home construction in the SF Bay Area in California - framing is complete. There are three levels, and the basement and main floor are planned for hydronic in-floor heating using pex in gypcrete (2.5" buildup for insulation and gypcrete). Exception is a home theater space in basement, which will mainly require cooling, so no in-floor system planned. Also, there is no in-floor system planned in the upper floor, which has three bedrooms and bathrooms. We got a quote for mini-split units to heat/cool the upstairs and the home theater, and I am not happy with the price/value ratio - I would prefer a non-forced air system if I am going to spend that much. It's not feasible to install a pex in gypcrete solution upstairs now because we don't have the 2.5" height or the structural strength in the upper floor. We could use aluminum spreaders and pex below floor boards ... However, although we don't expect to use cooling much, it would be nice to have in the bedrooms, so I am wondering about hydronic ceiling tubing to cover the entire upstairs and in the home theater ceiling. Any thoughts on this approach? Separately, does anyone have thoughts on the Daikin Altherma air source heat pump for supplying hot/cool water for this whole setup? Contacts who might be able to design this complex system in CA? Thank you!!