Hello again and thank you very much for your information.
The disadvantages have already been told to you. This is also not a ventilation system without heat recovery but an exhaust system. These are two different things.
Ventilation system is actually a generic term for exhaust system or supply and exhaust ventilation system with or without HRV and there are plenty of sources you can read about that.
What I have been offered is a controlled residential ventilation system from Wolf for a single-family house (bungalow) for exactly 11,500 € (I do not have concrete information).
Exactly. Zizzi, we have the combination, Helios exhaust motor, humidity controlled, i.e., it activates with humid air, otherwise it just vents quietly. The motor is in the bathroom. Supply air via RegelAir window slots. Costs unknown, was standard in the house. Works perfectly. Good air in the house, bathroom dries quickly. Don’t care about the energy saving ordinance and kfw, simple, rugged, reliable, that’s how it should be. Karsten
Nordlys, what you built is exactly what I am saying, i.e. old and humid air is extracted from bathroom and kitchen and fresh and not preheated air comes through valves in the wall or window frame of individual rooms. That is what is known as a central exhaust system.
Central systems have central and controlled supply/exhaust air.
In your case Nordlys it is an exhaust system with decentralized and probably uncontrolled supply air through the windows. So it is neither one nor the other. But it essentially has the characteristics of a decentralized system without heat recovery.
Central means when air is extracted centrally, with central or decentralized supply air. And I would not necessarily call uncontrolled supply through the windows, because exactly as much air comes in as is extracted, basically the amount of air exchange is regulated by the exhaust motor.
He is looking for something cheap. Those of us who have been here longer know him. He doesn’t have endless money.
I can tell Zizzi, it works fine this way, you don’t get a stiff neck, and the 2.50 gas monthly increase we save by drinking Pepsi instead of Coca. Karsten
Exactly. Nordlys, do you have underfloor heating or radiators? I ask because if you have radiators in the house the situation gets better, since valves will be mounted on the radiators and so cold supply air is immediately mixed with warm air and supposedly draughts are reduced this way. We will get underfloor heating.
Of course, one should not put the sofa under the ALD (outside air inlet), better said plan well in advance.
Did you have a choice between different ALDs? Like window rebate ventilator, ALD through roller shutter box or ALD in the wall. Difference?