Multisplit – does load/sizing effect defrosting frequency?
Over this past winter our Daikin 36k multisplit unit (4 heads – ground floor) did good until the outdoor ambient temp got down 37F or below. Then it would start defrost cycling. Cooling season last summer was fine. Worked like a champ all summer. We’re now getting ready to install another multisplit system on our second floor level.
My question is, if we change from a 36k outdoor unit to a 48k outdoor unit (pretty simple swap – pump down + swap + charge + test), would that decrease the likelihood of it defrost cycling during heating season? If so, I will move the 3 ton unit to the top floor and power the ground floor with a bigger 4 ton unit.
I guess, generally speaking, I’m ignorant on how compressor capacity effects heating performance when it comes to heat pumps. Do they perform better when the demand:capacity ratio is kept low?
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