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2. SYSAV waste-to-energy plant - Wikipedia

   en.wikipedia.org/wiki/SYSAV_waste-to-energy_plant

   The SYSAV waste-to-energy plant is the most energy efficient plant in Sweden, as well as being one of the most advanced plants in the world. The plant includes four boilers, the first two of which began operation in 1973. The two advanced boilers, fitted in 2003 and 2008 respectively, are steam boilers that generate electricity and district ...

3. Ground source heat pump - Wikipedia

   en.wikipedia.org/wiki/Ground_source_heat_pump

   Ground-source heat pumps (GSHPs) – or geothermal heat pumps (GHP), as they are commonly termed in North America – are among the most energy-efficient technologies for providing HVAC and water heating, using far less energy than can be achieved by burning a fuel in a boiler/furnace or by use of resistive electric heaters.

4. Here are the most and least energy efficient states - AOL

   www.aol.com/most-least-energy-efficient-states...

   Story at a glance Utah is the most energy efficient state in the United States, according to a new WalletHub analysis. The personal finance company compared home energy and vehicular energy ...

5. Enwave - Wikipedia

   en.wikipedia.org/wiki/Enwave

   Enwave Energy Corporation is a Canadian multinational energy company based in Toronto that focuses on sustainable district energy including heating, cooling, hot water, combined heat and power, and geothermal energy systems. It is one of the largest district energy systems in North America and has been referred as the leading energy district ...

6. New York is one of most energy-efficient states in the U.S ...

   www.aol.com/news/york-one-most-energy-efficient...

   The Empire State has the sixth-lowest residential energy consumption per capita and eighth-highest home energy efficiency as well. ... at over 50 times earnings for only 2nd time in company history.

7. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   In general, heat pumps work most efficiently (that is, the heat output produced for a given energy input) when the difference between the heat source and the heat sink is small. When using a heat pump for space or water heating, therefore, the heat pump will be most efficient in mild conditions, and decline in efficiency on very cold days.