Heating, ventilating and air conditioning systems use a significant amount of energy in the home. The U.S. Environmental Protection Agency has provided a guide to upgrading old heating and cooling equipment with energy-efficient equipment. Learn how to:

Home Air Cleaners
Air Quality
Is Mold Affecting Your Health?
Build Tight and Ventilate Right
Paints: A Green by Design Buying Guide
Five tips for an eco-friendlier yard
Energy-Efficient Lighting: Top trends
The Benefits of LEED-Certifying Your Home
Mainestream Green Home Design
The basics of pre-fab and modular homes
Residential Energy Guide
10 Ways to Save Energy and Other Stuff, Too
Easy Ways To Be More Energy Efficient At Home
Caulking and Weatherstripping
Seal and Insulate with Energy Star