Heat recovery

The heat loss in the winter in the new buildings is largely caused by ventilation. With the exchange of theexhausted air also we lose heat. Ventilation in a new building can cover from 30 to 60% of the total energy consumption (see calculator). In old houses, a significant amount of heat escaping through the non-insulated partitions such a walls and roof, thus contribution to loss of ventilation was smaller. With the walls, roof and windows warmer, the role of ventilation losses in the whole energy balance is growing. Further increase the thickness of insulation does not bring the improvement of the energy performance of your house. Often, in order to reduce heat loss from the home is user reduce ventilation flow, which results in deterioration of air quality and increase the moisture which can lead to the development of fungi and moulds.


Customer should look for a compromise between energy saving and proper ventilation of rooms. Mechanical ventilation can deliver such a compromise. The best current solution is to use the ventilation system with intake-exhaust air handling unit with the heat recovery.

Theintake-exhaust ventilation system is different from the exhaust that not only removes air from the building, but also delivers fresh air. The air is drawn from outside the system and through ducts delivered to the rooms. Other channels, exhaust, remove contaminated air from the kitchen, toilets, bathrooms and dressing room. Such a system allows keeping full control over air exchange. This is significant not only because of the air quality but also for reducing heat loss through ventilation.


Mechanicalintake-exhaust ventilation system gives the opportunity to recover a significant amount of heat from the exhaust air. The main element of the system is a ventilation unit. The panel is made up of fans and heat exchanger. Electrically powered heat recovery units allow you to recover on average 50-80% of the heat from the exhaust air from the building.

Energy is recovered by heating the cold air drawn from the outside heat from the exhaust air. As a result, the air supplied to the room it does not cool down too much the space and hence less energy is required to maintain the temperature. Heat exchangers are constructed in such a way that waste, removed air does not mix with fresh air sucked into the building.