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Infiltration heat load is the movement of air through widow and door frames and the movement of air from the out side to the inside through open doors and windows. Appliance heat load is operating appliances generate heat, e.g., electric lamps that convert 75 to 95 per cent of there electric energy consumption to heat. Ventilation heat load is the heat removed from air as it is cooled in the air cooling process. The size and operating cost of the air cooling system depend on the ventilation air, the air properties (relative humidity and temperature) before cooling, and the building cooling requirements.

A series of computations are required to determine the size of an air conditioner. Interfacing and controlling air conditioning and heating system, Victorian fireplaces are components to produce air with in the ‘comfort zone’ have been a problem for chief engineers and building managers for years. How will each component effect either or both the sensible and heat content of the air? The relationships can be very complex. For example, if the space heat load changes during the day, the space will get either warmer or cooler, which affects the exhaust air temperature and moisture levels from the conditioned space? The air conditioning system can be a costly system to be maintained.