Air Conditioners and HVAC Systems on Design Build Network
Heating, Ventilation and Air Conditioning (HVAC) - Equipment and Services
http://www.designbuild-network.com/contractors/ventilation/
Room Air Conditioners : ENERGY STAR
ENERGY STAR qualified room air conditioners often include timers for better temperature control, allowing you to use the minimum amount of energy you need ...
http://www.energystar.gov/index.cfm?c=roomac.pr_room_ac