HVAC stands for heating, ventilation and air conditioning: the systems that control temperature, humidity and air quality in buildings.
In parking facilities, the largest HVAC system is usually ventilation. Open garages are ventilated naturally; enclosed and below-grade garages need mechanical exhaust under the International Mechanical Code. Heating and cooling are limited to occupied or sensitive spaces such as elevator lobbies, offices, cashier booths, and electrical, communications and PARCS equipment rooms.
In parking facilities
- Garage ventilation. Exhaust fans controlled by carbon monoxide and nitrogen dioxide sensors. See mechanical ventilation and demand-controlled ventilation.
- Fan control. Variable frequency drives let fans run at partial speed, saving energy.
- Equipment rooms. Cooling for electrical switchgear, EV charging equipment and data cabinets.
- Smoke control. In some enclosed garages, ventilation also supports fire department smoke removal.
The Parkonomics view
In an enclosed garage, ventilation fans can be one of the largest energy loads. Demand control, VFDs and working sensors are where most of the savings are.
Related terms: Mechanical Ventilation System, Demand-Controlled Ventilation, Natural Ventilation, International Mechanical Code, Variable Frequency Drive