A long-term approach to upgrades
The best solution from a long-term and energy-efficiency perspective is to convert an existing solution to an air-to-air heat exchange ventilation system in order to achieve the ideal indoor climate.
Converting an extract-air-only or natural ventilation system to an air-to-air system poses certain challenges:
- Option of retaining existing ducting
- Space for new ducts
- Unit siting
- Fire protection solution
- Connection with existing kitchen flues
One solution is to install a compact one piece unit for flexibility in the existing building layout. Having various options for siting fans and duct connections means that you can save installation space, and also makes it easier to replace units when the time comes.How air-to-air heat exchange ventilation systems work
How much can you save?
With an energy class A air-to-air heat exchange ventilation unit, the saving is 40 kWh/m² per annum. For a 160 m² unit with natural (non-mechanical) ventilation, the annual saving from installing an energy class A air-to-air unit amounts to 6,400 kWh annually according to the calculation model based on the Ecodesign Directive.
An energy class A air-to-air unit means a unit with consistently energy-efficient construction and demand-controlled ventilation. Where the air change in apartments is controlled by sensors which increase and decrease the air change rate depending on the number of occupants and air quality.