In the summer, they work like air conditioners, pulling heat from inside the house and forcing it outside. In the winter, it works in reverse, gathering heat from outside and distributing it through the house. Heat pumps have an electrically powered backup for especially cold days. Eco-friendly geothermal heating is a kind of heat pump. Instead of pulling heat from air, pipes are buried underground to pull heat from the earth.
Geothermal heating is most cost effective when installed with a new home.
Solar heating uses panels to collect energy from the sun and convert it into heat. Where To Get Your Questions Answered Planet Feedback is a service that allows you to either ask questions about products, or to seek help in disputes with manufacturers or vendors. Planet Feedback offers to intercede to help make sure the manufacturer pays attention to you. This site touts the case of a customer at Radio Shack, who wasn't allowed to return a product until Planet Feedback pressured the store on his behalf. You can try this service on the Manufacturer Feedback Center .