Variable speed refers to the speed of the lover motor from the air handler – the indoor Component of the equipment that moves cooled air through your private home’s ductwork. US Heating and Air-con can assist you make the correct choice for your home. Ventilation duct with outlet diffuser vent. https://hvac51616.thezenweb.com/the-smart-trick-of-hvac-that-no-one-is-discussing-70685720