What Are Rooftop HVAC Units Used For?
How Does A Rooftop HVAC Unit Work?
It’s worth noting that while RTUs are slightly different from indoor HVAC systems, the main function is the same: They heat and cool our premises during those hot and cold days.
While some RTUs heat and cool only, others can do both.
How RTUs heat
A HVAC rooftop unit heats air by first connecting to either an electrical heating element, a heat pump or a gas burner. Other RTUs, though less common, create heat via a gas heat exchanger such as a furnace.
How RTUs cool
- Heat goes through the evaporator coil when it comes out from the refrigerant.
- As the pressure lowers, the refrigerant turns liquid.
- While still in its liquid form and spreading via the could, the refrigerant sucks up heat from the building’s warm air.
- Once the heat from the air is sucked up by the refrigerant, cooler air is passed via the ductwork by the evaporator fan to the rooms within the building.
- At this point, the refrigerant is heated and changes to gas form. While in this state, it goes back to the compressor to let out and deplete the heat.
- This process keeps on happening until the building’s surrounding temperature aligns with those set by the thermostat and other controls.