HVAC (Heating, ventilation, and air conditioning) is the technology of ecological comfort, aiming to provide acceptable air quality and thermal comfort, HVAC is an important part of infrastructural arrangements such as residential buildings and vehicles such as cars, trains, airplanes, ships, etc. = 1) Heating Heating refers to the process of rising and maintaining a temperature of a confined space ensuring the comfort of the occupants, some of the common heating methods are • Warm air heating • Hot water heating • Steam heating • Electric heating 2) Ventilation Ventilation refers to air circulation within a building with an intention of removing heat, dust, smoke, bacteria and any unwanted moisture thus improving air quality, types of ventilation systems include • Exhaust ventilation system • Balanced ventilation system • Supply ventilation system • Energy recovery system 3) Air conditioning Air conditioning is the
