About heat recovery ventilation system
This modern-technology appliance should be a vital part of every well-insulated household. Unfortunately it is yet to be widely used and for that the main reason is that it is simply not well-known, and the installation costs are considered fairly high.
Because we breathe out carbon-dioxide and water vapour, which will not leave our environment through the almost air-tight windows and doors without ventilation, we are creating poor quality air around us. We can improve the quality of air inside our apartment by frequent airing, however this can cause huge heat loss during winter time. Read more