Heating, ventilation, and air-conditioning are seen in the context of natural processes and alternative technologies, such as the passive and active uses of solar and wind energies.
(Heating, ventilation, and air-conditioning; are seen; L:in the context of natural processes and alternative technologies, such as the passive and active uses of solar and wind energies)
Heating, ventilation, and air-conditioning
are seen
L:in the context of natural processes and alternative technologies, such as the passive and active uses of solar and wind energies