(pronounced ERTH toobz)
Earth tubing is a zero-energy, geothermal solar heating and cooling system that is low-tech and sustainable. Also known as earth-air heat exchangers, it works by having filtered fresh air enter a series of pipes (the “tubes”) embedded around the interior of a structure’s foundation, absorbing energy from the surrounding soil and moderating the temperature of fresh air intake. Air then drafts naturally through the earth tubes, supplementing a home’s backup heating and cooling system. This often affordable option is sustainable since no burners, compressors, or chemicals are used.