Is using phase change insulation with ductless minisplits the perfect marriage?
I’m interested in using phase change material with a ductless minisplit heatpump – they seem like the perfect combination. (Also, the phase-change insulation discussion on this site are pushing a decade old and I’m hoping for a refresh.) There seems to be several people selling phase change insulation materials now including – http://www.insolcorp.com and http://www.phasechange.com – claiming a 25-35% HVAC reduction. I am specifically wondering if I used phase change material with a ductless minisplit would that allow me to reduce the size of the outdoor unit and number of indoor units I needed to install to have a consistent indoor temperatures throughout the the house. As I understand it, a minisplit ‘wants’ to run constantly at a narrow temp range, so it could be set around the phase change temps to take advantage of off-peak electricity – pre-cooling the phase change at night at off-peak rates and not have to work as hard in the daytime.
Some specifics to my situation – I am building a 2,000 sq ft house with R-19 walls and R-30+ ceiling. Our peak (day) electricity is 4x more expensive than our off-peak (night) rates. We are in Northern California (USDA Zone 10A) with good diurnal temps swings. The temperature range I’ve attached is a bit misleading with plenty of 100+ F days and few <30F days a year, but the general daily temperature range is accurate with only a few hot evening a year. I would appreciate your thoughts on the combination generally and how it would work for me specifically. Regards, Patrick
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