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Heat always flows from warmer to colder material > < Basics of air conditioning

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Physical basics:
Physical basics:
   
The four known physical states of water also apply to air conditioning refrigerants.
1 - Gas (invisible)
2 - Vapour
3 - Liquid
4 - Solid
  N87-0531
When water is heated in a container (heat absorption), the rising water vapour is visible. If the vapour is heated by further heat absorption, the visible vapour becomes invisible gas. This process is reversible. If heat is extracted from gaseous water, it changes first to vapour, then to water and finally to ice.
A - Heat absorption
B - Heat dissipation
  N87-0529

Heat always flows from warmer to colder material > < Basics of air conditioning