Thanks to the heat recovery, fresh air is heated by the waste air to avoid heat losses due to ventilation. The heat that is produced in the apartment thus stays inside, and fresh air comes from the outside preheated to a pleasant temperature.

Powerful ventilation with the heat exchanger will replace at least 10% of the air volume within an hour. During ten hours, the air is completely exchanged in the apartment which positively affects the air quality whether from the point of view of carbon dioxide content, odours, or moisture in the air. The whole system is regulated and its performance can be increased several times.

There are two separately adjustable branches in the apartment - one for removing air from the kitchen, the other for the rest of the apartment. It is therefore possible to increase, for example, the extraction of kitchen vapours during cooking and at the same time keep the ventilation of the rest of the apartment to a minimum.

The advantages of this system will be understood by every user, not just personal experience. We can conclude that, in general, it is about improving the overall user well-being in the apartment and there are only positive reactions from the users about this system and in particular for the following reasons:

• The air ventilation doesn't shock - that means it avoids temperature differences which not only leads to increased living comfort but will be appreciated by, for example, temperature-sensitive plants
• The fresh air is preheated by exhaust air, therefore significantly reducing the energy consumption for heating
• Air exchange is regulated. At the minimum power, 10% of the air in the apartment is exchanged in an hour which ensures a pleasant dust and moisture-free environment without being perceptible
• The air-conditioning system greatly increases the hygienic comfort of living - no condensation on windows, the corners of the rooms are not damp and this prevents the formation of mould and mildew
• Exhaust air from the kitchen – the entire space is ventilated, not just the space above the stove. Of course, it is recommended to add an extractor hood with a carbon filter above the cooking area which will ensure the localised filtration of cooking odours

If these ideas scare you more than anything, don’t worry and keep reading. At basic level, the BLV project only gives you those fixtures you can control, including manually, the way you are used to them, while also allowing you to expand them substantially in accordance with your wishes.

You will have in your apartment:

• control unit
• thermostatic dials on radiators
• smoke detector

Other fixtures you can order and easily connect to the current system include clever dimmers which provide exactly the right amount of light you need and which can respond to when you arrive, and the momentary light situation. You can also easily measure the consumption of all your appliances, set the times they come on at, plus other advanced options. The system can also warn you if any appliance breaks down, and intervene in the event of flooding or fire. Other options for expanding your system include movement and twilight sensors, CO2 sensors, cameras, door magnets and in future also weather stations. The system can also be linked to systems for controlling home audio and video.