Geothermal heat pumps have energy efficiency. Even better, they can help you save money. They routinely surpass 100% operating efficiency compared to traditional electric systems. They are unaffected by wind, rain and other weather factors, which results in fewer repairs. The Federal Renewable Energy Tax Rebate lets you deduct up to 26% of the cost of installation. Also, they use less electricity, lowering your electric bill and producing fewer carbon emissions.