An air conditioner cools (and heats) a room by moving heat using a refrigerant. This happens through a closed system with an indoor unit and an outdoor unit, which are connected by cooling pipes.
Cooling: removing heat to the outside
When you set the air conditioner to cooling, the following happens:
The indoor unit draws in warm room air.
This air flows past an evaporator containing refrigerant.
The refrigerant absorbs the heat and evaporates (from liquid to gas).
The absorbed heat is transported via the cooling pipes to the outdoor unit.
In the outdoor unit, the heat is released into the outside air.
The refrigerant condenses back into liquid and flows back inside.
👉 Result: the warm air is removed and the indoor unit blows cooled air back into the room.
Heating: the process reversed
An air conditioner can often also heat. In that case, the process is reversed:
The outdoor unit extracts heat from the outside air (even at low temperatures).
The refrigerant transports this heat inside.
The indoor unit then blows warm air into the room.
This principle works like a heat pump: heat is moved instead of generated.
The main components
An air conditioning system consists of:
Indoor unit (with evaporator and fan)
Outdoor unit (with compressor and condenser)
Cooling pipes that connect both units
Refrigerant that continuously changes from liquid to gas and back
The smart interaction of these components ensures that heat is efficiently moved – whether that is outside to cool or inside to heat.
Would you like to know more about energy-efficient solutions such as solar panels or home batteries? Then check out more articles on this academy or contact us. Together we ensure a future full of energy.
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