ᐅ Lower Indoor Temperature After Starting Operation of Mechanical Ventilation with Heat Recovery

Created on: 24 Jan 2020 13:15
C
chrisw81
Hello everyone,

On Thursday, our controlled residential ventilation system (Vaillant recoVair 260 E with heat recovery) was put into operation.
We have an indoor thermometer, and since the system started, the temperature has been about 1 degree (maybe a bit more) cooler than before.
It feels noticeably fresher in all rooms (including the unheated ones).
My question is, can the heat recovery unit not warm the incoming air sufficiently? Have you experienced a similar effect?
I understand this might be due to the constant air exchange, but the consequence would be needing to heat more, which seems to contradict the energy efficiency advantage of passive houses.

Thanks for your opinions.
G
guckuck2
25 Jan 2020 18:03
Why air at 2°C (36°F)? It is preheated by the heat recovery system, for example, see the post by curly.
tomtom7925 Jan 2020 18:10
I expressed myself incorrectly: 2–3 degrees Celsius (35.6–37.4 degrees Fahrenheit) colder than the room.
G
guckuck2
25 Jan 2020 18:11
Oh, I see. Yes, that’s correct. You can feel a draft at air exchange rates of 0.3–0.4, but not below that.