Links
Information on government tax credits for HVAC
http://www.energy.gov/taxbreaks.htm
http://www.energystar.gov/index.cfm?c=archives.furnace_spec
http://www.energytaxincentives.org/consumers/heating-cooling.php
http://www.dsireusa.org/library/includes/map2.cfm?CurrentPageID=1&State=NC&RE=1&EE=1
Honeywell Zoning and Humidification
Air duct cleaning