Ventilation systems – do they really recover heat?
If you want a true energy recovery ventilator for your home, ome, a balanced system with a real heat exchanger is the only y way to truly recover energy which is usually wasted, to warm or cool your home. This is no more evident than in the ndings of a comprehensive Otago University Report commissioned d for EECA (Energy Ef ciency and Conservation Authority), ity), researching the heating and cooling potential of ventilation lation systems. The study carried out by the Department of Physics at Otago University was published in May 2011. The report speci cally eci cally focused on current domestic residential systems, measuring asuring the amount of heating and cooling available for capture ure from roof space air. The report states, “the majority of the time, it was calculated that pumping air from the roof space into the house would provide no heating or cooling bene t.” If you are looking to purchase a ventilation system and nd you are considering heat recovery as part of this, make sure you do your homework. Most ventilation systems will work rk best in conjunction with another heat source such as a heat t pump. The best systems on the market are those that recover ver heat through a heat exchanger. This means that the stale e air is passed over the fresh air, recovering energy from the he air being extracted to supply your home with fresh, tempered mpered air.