Other
Warm Air: Central Air Conditioning
The operation of conventional air conditioners are described. Their parts and the refrigerant/heat exchange cycle is discussed. The use of alternative geothermal systems are explained.
Science4Fun
Science4 Fun: Heat
What is heat? Illustrated discussion of how heat is transferred and its effect on the states of matter.
US Energy Information Administration
U.s. Eia Energy Kids: Energy Units Basics
Instructions for converting the physical measurements of different types of fuels, such as gallons or barrels, to British thermal units (Btu), allowing for cross-comparison.