ᐅ Advantages and Disadvantages of Ventilation and Exhaust Systems

Old building? Or?

Try doing that with a KFW 55 house when not ventilating for 2-3 days

Besides, it doesn’t make much sense to keep the door open when it’s 30 degrees Celsius (86°F) outside. You’re just letting humid, hot air into the house.
And seriously: I have insulated and upgraded my old building, especially under the roof. Ventilation is necessary. Everywhere else as well, by the way. I would really like to have a central ventilation system.

Our building consultant, a typically conservative pragmatist as most are here, told us: We will, must, and want to build airtight so that you, as the customer, will need very little energy. Therefore, I strongly recommend a mechanical ventilation system. But it doesn’t have to be expensive... a controlled residential ventilation system is not necessary. He said it’s enough to install window frame vents and use a humidity-controlled Helios exhaust fan in the main bathroom. It’s quiet, uses little electricity, and can run continuously. The extra cost for this simple ventilation system, typical for Holstein, was basically zero—it’s his standard. If I had absolutely refused it, he would have given us a credit of 1000. Now it’s installed, and the frame vents are in place as well. The electrician connected it to a light switch, so I could switch it off—but I don’t. It always runs. It’s really quiet. And even if all windows are closed, the air inside the house doesn’t feel stuffy. Okay, the house is small, only one story, but for a building like this, that setup seems sufficient. We still keep the windows open regularly—I feel like a house like this heats up incredibly fast. So a breeze is welcome. But I believe having no ventilation at all wouldn’t be good, even though it’s only built to the KfW 70 standard. Looking forward to seeing how it performs in winter. Karsten

Heating up quickly is not pleasant; the roller shutters would have helped with that [emoji16]

Winnetou, have you ever been to Spain? They have all these shutters in front of the windows, precursors to roller blinds. Always closed, locked, sealed, unwelcoming. Like the Spaniard, so their house. Terrible, I don't like it at all. Oppressive, dreadful. And these shutters are often gray too. With those box housings.

It's like shutting out the sky. No, I firmly believe it’s not the microwave but the roller shutter that causes illness. My opinion is clear, don’t confuse me with facts. Karsten

No, your sky should stay blue.
Yes, I was there and can understand the poor Spaniards.

And I don’t want to live without roller shutters anymore; without them, it would be unbearable here in the apartment. They are down on the west side in summer, mostly when we are not at home, and that helps a lot.