These are various web sites that I have found helpful.  Will keep adding them as I find them.

Saving money

Go Green HVAC – web site that discusses how to save money and the environment starting with your home

Energy Star – The main web site involving energy efficiency.  Only problem with this site is that it’s to big.  Some of the others on my list reference this site and may be an easier way to get to what your looking for.

Air Quality

Indoor Air Quality – A great resource for anyone needing to learn how to better protect your home from pollen, polution, and air born viruses and bacteria.

EPA – Another monster site of information.  This link will get you straight to the indoor air quality section which should save you some time.

NEA – National Education Association, some solid health related information there.

General information

Lennox – there site is chalk full of resources and helpful tools.

Four Seasons – While predominately a Chicago land company, they have a lot of great information.  and are a nationally recognized contractor that has won many awards for excellence.  Even if your not in there coverage area you can find a lot of information here.

Free building mechanical systems information – Some good content and explanations of terms.  Site seems to be adding content regularly and is worth revisiting.