> Turning a huge HVAC system off and back on again quickly if it's not designed for that would probably reduce its operating efficiency. A lot of Rooftop Unit

> Turning a huge HVAC system off and back on again quickly if it's not designed for that would probably reduce its operating efficiency. A lot of Rooftop Unit (RTU) controls typically take an on/off command from the Building Management System (BMS) and the BMS programming will have a deadband range (+/- 2°F) in which no action will occur to prevent the repeated cycling of RTUs.