To minimize energy costs, ventilation can be combined with air-to-air heat recovery systems, which transfer heat (with minimal use of energy) from outgoing warm air to incoming cool air and vice-versa.
(ventilation; can be combined; with air-to-air heat recovery systems, which transfer heat (with minimal use of energy) (air-to-air heat recovery systems; transfer; heat)
ventilation air-to-air heat recovery systems
can be combined transfer
with air-to-air heat recovery systems, which transfer heat (with minimal use of energy
heat