Free energy to heat your home. It's beneath your feet. About four-feet under ground, temperatures are approximately 50-degrees. Even in the winter. After installation, our geothermal heat pump provides heat or cooling for only the cost of operating the compressor. No wonder the cost savings typically are about 70%. One Newberg, Oregon home owner reported an average monthly cost of $65.25 per month for a new 5200 s.f. home. The outstanding performance of the Sub Terra Energy System has been well proven to hundreds of owners.