Geothermal Heat Exchangers

The optional Zehnder ComfoFond geothermal heat exchanger utilizes the relatively stable soil temperature of the earth for heat recovery and tempers the supply air by means of a ground loop (HDPE or PEX). Geothermal energy is collected in the fluid in the tubing and used to pre-heat or pre-cool the supply air before entering 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.