As of 2015, boilers offer the most cost-effective heating for most homes. People in warmer regions or small homes, however, may find the upfront cost to be too high. More »

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Monolithic dome homes are more energy efficient than traditional homes; this is due to their structural makeup. Dome homes are built with concrete on both the exterior and interior walls, and concrete aids insulation. More »

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Gibson offers a range of gas furnaces with annual fuel utilization efficiency ratings of 80 to 95.1 percent. Fixed-speed furnaces are available in single- and two-stage models. More »

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Space heaters are an energy efficient option for home heating, particularly in residences with fans, thermostats and timers. Space heaters allow for heating only one room, thereby avoiding the expense of heating the enti... More »

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Electric boilers are very efficient for heating large homes because they do not have the heat loss associated with fossil fuel burning boilers. The annual fuel utilization efficiency of an electric boiler is in the 90th ... More »

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Wood gasification boilers are the most efficient means of extracting energy from wood for residential heating, but they are considered less efficient than natural gas, propane and oil boilers. Homeowners who have access ... More »

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Bosch Greenstar condensing boilers are ENERGY STAR-certified as energy efficient. As of 2015, eight Greenstar models were certified. Certified products have passed third-party testing at laboratories approved by the U.S.... More »

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