To keep your beer fresh and your room cool, heat has to be removed and thrown away in the warm outside. It's like pumping water uphill. Here's where you can learn how it's done.

Refrigeration - Turning the physics into a fridge
What is Cold? Why can't we have a "microwave" freezer....brrr....	How can heat be made to flow "uphill" to a higher temperature?	Refrigeration takes energy. How much? What is the minimum possible energy?
How does it work? What does the refrigerant do?	What does it take to make the simplest fridge?	Must we always supply electricity or energy? Can we cool without?

About 15% of the world’s electricity is used to drive refrigerating and air conditioning systems!