The removal of pressure allows the freon to boil. The conversion from liquid to gas cools the freon so thermal energy flows from the house to the freon, warming it up. The room temp. This allows you to do work and move thermal energy from one place to another. 7.2 Automobiles Use thermal energy to do work.
Efficiency is increased by using a large temp.
This is a feature of real-life compounds. An ideal gas is a compound that has no attraction between it's molecules and they are infinitely small. The molecules of real compounds attract each other. If we can get the atoms closer together they can stick to each other. When they stick they release the excess kinetic energy that they don't need anymore.