Humidity and Heat

A customer has a question and I hope we can get some opinions on it, thanks.

"Hey and need help with humidity and heat from my grow room
this is my 3 grow im doing now but still very new in it.
from germination to harvest my heat is allways in 24-25 celsius to max 28 celcius i have trying all i now and reading to fix it without progress, and my humidity is in 40%-50%. in the begining and when the plant grow it geting higher what to do plz help me

PS: my writing in english is bad

i have putt in some links here to show you my grow/grow room setup is in swedish but what is not google translation
if you dont understand say what then and itry to explane beter and mor
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