VAV boxes provide cooling in harmony with perimeter heating, with both systems controlled by a single thermostat. When the perimeter heating valve no longer seats properly, unwanted heat is continuously introduced into the space. The thermostat automatically compensates by increasing cooling to maintain the desired room temperature. Occupants remain comfortable, but the simultaneous heating and cooling conceal significant energy waste, allowing the problem to persist unnoticed.
Significant savings for school
This HVAC case study examines the heating control systems in the oldest high school in Peterborough, Ontario, and proposes energy-efficient improvements.