If you’re looking to replace your furnace, now would be a great time to switch to a geothermal heat pump (GHP). Since they utilize a natural source of energy, GHPs are well over 100 percent efficient. In fact, they can reach efficiencies as high as 600 percent. Since heating and cooling usually compromise the majority of a household’s energy use, this can lead to much lower energy bills. It also makes it easier to make your home self-sufficient energy-wise via onsite electricity generation from renewable sources.