Heat pumps are 3 to 5 times more efficient than gas, fueled-heating systems and electric resistance heating and so can lower ...

Energy stored in thermochemical materials can effectively heat indoor spaces, particularly in humid regions, according to ...

along with potential savings for using a space heater for a portion of the day. For those using oil or propane as fuel, the savings are significant: $434 for propane and $506 for oil just through the ...