An absence of ductwork helps make ductless units highly efficient, as it’s believed 20% or more of conditioned air is usually dropped via leaky ducts or badly insulated ductwork. Vents/Registers: Vents and registers are opening in partitions, floors, or ceilings in which conditioned air enters rooms and where return air https://hvac41616.blogginaway.com/31990392/5-simple-statements-about-hvac-explained