There are actually 4 major different types of HVAC units: Break up methods, hybrid systems, ductless systems and packaged heating and air units. It is best to decide on what’s best suited for your private home and budget. Humidifiers add humidity for the air and dehumidifiers get rid of it. https://hvac33322.bloguetechno.com/hvac-can-be-fun-for-anyone-66122590