The following are the types of room air conditioner :
1. Cooling unit.
2. Cooling and heating unit.
3. Heat pump
Cooling unit
With this unit, the room can be cooled very easily. Evaporator, condenser, filter and refrigerant are used in this unit. The refriger ant liquid is changed in the vapour or gas form to absorb the heat. The gas or vapour is changed into liquid to condense the heat or the heat giving out from the gas.