How heat recovery ventilation systems work


Good ventilation helps to create a healthier environment for you and your family. It works by removing polluted and moisture-rich air found in the home, and replaces it with fresh air taken from outside.

The principles of mechanical ventilation with heat recovery system (MVHR) are simple: contaminated stale air is continuously replaced by warmed, fresh, filtered air. Importantly, a highly efficient heat exchanger is used to recover over 90% of the stale air’s heat and transfers it to the incoming air. In the summer months a bypass system allows fresh, filtered air to be introduced without being heated by the heat exchanger.

A ground to air heat exchanger (GAHX) works in conjunction with the MVHR to really make the most of your natural surroundings. The GAHX provides an extremely cost effective source of renewable energy by using the temperature of the ground. At depths of 1.5 to 2 meters, the earth’s temperature, in the UK, is a constant 8-12 °C regardless of the time of year or the outside air temperature. This significantly reduces your heating and cooling bills as well as providing long-term environmental benefits…