ᐅ Experience with centralized exhaust ventilation systems without heat recovery

One-sided information???? I requested 8 quotes for the same system with installation, and the total prices ranged from 4000 to 10,000 euros.

Uninformed question marks question marks question marks

For a well-functioning mechanical ventilation with heat recovery and enthalpy heat exchanger as described, the device alone costs around 4000 euros. A proper mechanical ventilation system also includes an earth heat exchanger, which doesn’t just appear in the garden for free.

Of course, it’s always possible to go cheaper, but then it’s no longer about quality, durability, or comfort. You can also build a house for 1500 €/m2 (approximately 140 $/ft2) if that makes you happy, which is completely fine. Calling a house that costs 2000 €/m2 (approximately 185 $/ft2) overpriced scam is just as nonsensical as your statement.

Mycraft schrieb:
The disadvantages were already mentioned to you. This is not a ventilation system with heat recovery but an exhaust-only system. Those are two completely different things.

Also, this has nothing to do with Mercedes—at $12,000 you’d probably only get something equivalent to a Golf installed. What you’re looking at is more like a moped.

Not recommended, no.

But certainly better than nothing at all.

Many people even have holes drilled in their window frames and are happy with that.

Exactly. Zizzi, we have the combined system, a Helios exhaust fan, humidity-controlled, meaning it activates with humid air, otherwise it just exhausts quietly. The motor is installed in the bathroom. Fresh air enters through RegelAir window vents. Cost unknown, it came standard with the house. Works perfectly. Good indoor air quality, bathroom dries quickly. Forget about energy-saving regulations and KfW subsidies—simple, rugged, reliable, that’s how it should be. Karsten

Nordlys schrieb:
Exactly. Zizzi, we have the combination of a Helios exhaust fan motor, humidity-controlled, meaning it activates when the air is humid, otherwise it just ventilates quietly. The motor is located in the bathroom. Fresh air supply is through RegelAir window vents. Costs unknown, it was standard in the house. Works perfectly. Good indoor air quality, bathroom dries quickly. Doesn’t care about energy saving regulations or KfW standards, simple, rugged, reliable—that’s how it should be. Karsten

But that is decentralized; he means a centralized system for all rooms.

Why? That’s the main point. A Helios ventilation system for the whole house in the bathroom, many window vents for fresh air supply. Since zizzi also builds on one level, he could design it the same way and have fresh air for a small cost.

Central systems have central and controlled supply/exhaust air.

In your case, Nordlys is an exhaust air system with decentralized and probably uncontrolled air inflow through the windows. So it is neither one nor the other. However, it essentially has the characteristics of a decentralized system without heat recovery.