Geothermal Heat Exchangers

The optional Zehnder ComfoFond geothermal heat exchanger utilizes the constant temperature of the earth for heat recovery and tempering the supply air by means of a Ground Loop HDPE or Pex. tubing installed in the ground. Geothermal energy is collected in the fluid in the tubing and used to preheat or cool the supply air. The energy it contains is transferred to the fresh supply air via a heat exchanger upstream of the ventilation device.

Geothermanl Heat Exchanger for HRV systems


The ground source heat exchanger ComfoFond-L is designed to temper incoming air to the CA 350, CA 550, Paul by Zehnder Novus 300 and Paul by Zehnder Focus 200. During cold winter weather, the incoming air is warmed to help prevent frost and increase efficiency. During hot, humid summer periods the incoming air is cooled, and some moisture is removed. Controls are integrated for the ComfoAir units while the Novus and Focus units utilize an external controller and power connection allowing for easy installation and flawless operation.