EPA Indoor Air Quality

http://www.epa.gov/iaq/

OSHA Indoor Air Quality

http://www.osha.gov/SLTC/indoorairquality/

MedlinePlus Indoor Air Pollution

http://www.nlm.nih.gov/medlineplus/indoorairpollution.html

American Council for an Energy-Efficient Economy, Top-Rated Central Air Conditioners

http://www.aceee.org/consumerguide/topcac.htm

Rheem

http://www.rheemac.com/

Honeywell

http://yourhome.honeywell.com/

American Lung Association Health House, Fall Furnace Tips

http://www.healthhouse.org/consumer/FallFurnaceTips.asp