I was thinking of insulating the attic well and introducing fresh air and then sending that same air to the incubation and fruiting rooms. I was also thinking of adding a separate fan for each fruitingroom that would additionally extract CO2 and make small holes on the sides where fresh air would enter and thus have negative pressure inside. I don't know how it would work, I would like to hear other people's opinions.

For now, I’m using a standard magnetic stirrer for liquid cultures, but all the parts for building an aerated LC system are on the way. I’ve also experimented with recipes that use 1% nutrients on agar, and I’ve noticed the mycelium can shift from tomentose to rhizomorphic growth when I prepare it that way. I haven’t reached the fruiting stage yet, but I’m really curious to see if this approach will result in a higher or lower yield.

Klime is air conditioner 

Ivan Mikic I Found them but still im confused about working temp..

I found on most of the that they are working between 45-55°C. Did you made some changes/hacks to rise that? Can't open those link, I'm in Bosnia and Herzegovina.