Supporting Equipment for Heating and Cooling Systems
Thermostats and ducts provide opportunities for saving energy. Dehumidifying heat pipes provide a way to help central air conditioners and heat pumps dehumidify air. Electric and gas meters allow you to track your energy use closely.
Thermostats 
For most heating and cooling systems, programmable thermostats provide an inexpensive and effective way to save energy.
Ducts
Information on duct designs for new homes and retrofits, fixing deficiencies in existing duct systems, and maintaining ducts.
Dehumidifying Heat Pipes
Helping air conditioners and heat pumps dehumidify air in humid climates.
Gas and Electric Meters
Learning how to read your electric and gas meters will allow you to keep close track of your energy use.