ᐅ Ventilation system in summer?

Created on: 19 May 2017 13:52
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Tommes78
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Tommes78
19 May 2017 13:52
Hello everyone,
I’ve heard different opinions about this. What do you do with the ventilation system in summer, turn it off or leave it running?
In the past few days, when it was warm outside, I noticed that heat was also coming in through the ventilation system. The supply air was about 24°C (75°F) even though the outside temperature was around 28°C (82°F), so it’s no surprise the house gets warm.

How do you handle this?
Mycraft19 May 2017 14:03
Well, if you turn them off, you will have to ventilate manually, and I doubt that will reduce the heating effect... and once the heat is inside, it stays there... so our system keeps running...
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Aotearoa
19 May 2017 14:04
Phew, good question.
Turning it off is not an option here because the air inside the house quickly becomes stale. At night, the windows in the attic are open.
I’m open to any ideas.
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Tommes78
19 May 2017 14:05
Well, I can turn it off during the day and switch it back on in the evening when the temperatures are milder.

Don’t you experience the effect of your house warming up because of the system?
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Barossi
19 May 2017 14:06
In the evening, at night, and in the morning it gets cooler, making the mechanical ventilation with heat recovery especially useful during these times.
Teyla19 May 2017 14:35
We experienced the same issues during the last two summers and want to try a different approach this year.

We reprogrammed the system last weekend.
It is completely off during the day (since we’re not home anyway, so the poor air quality doesn’t bother us) and set to level 2 at night when it’s cooler outside.

The air quality does worsen when the system is off, but I feel it has still achieved the desired result. The house heated up significantly less during the recent warm days compared to last summer. For now, we will keep it this way, but we might switch back to normal operation during longer periods of bad weather.

P.S. How old is your house? Is it already dry?
Our house (2 years old) is dry by now (humidity on normal days is usually around 30-40%, which is actually a bit too dry), so there shouldn’t be any problems with the system being off during the day.