An absence of ductwork tends to make ductless units highly efficient, because it’s believed twenty% or more of conditioned air is usually dropped as a result of leaky ducts or inadequately insulated ductwork. Some methods include an "economizer manner", which is usually referred to as a "free of charge-cooling manner". https://hvac27046.timeblog.net/67261372/an-unbiased-view-of-hvac