by: Capa Tpeuj
Heating and cooling account for 56% of energy use in a typical American home. It is the largest energy expense in most homes. In heating and cooling systems there is normally a lot of space, like thermostats, and ducts which leaves a lot of room for energy saving. Sometimes, instead of just having to update your heating and cooling systems, sometimes its better to just replace your system completely. Depending on where you leave, cooling your home could be done by opening a window, but in some places it is much more complex (like a central air conditioning unit). A lot of homes use a furnace or broiler, but you could also use wood stoves to activate solar heating systems.
more info: http://www.energysavers.gov/your_home/space_heating_cooling/index.cfm/mytopic=12300