45 is in the 'good' range.
if there is a window in your room, run a small a/c unit... it will strip excess heat AND moisture right out of the air.
That's how I used to do it anyway; I managed to keep my %RH in the 30s even in our nasty muggy New England July
stinkyattic Reviewed by stinkyattic on . humidity to high what can i do to bring down my humidity without buy a 200 dollar dehumidifier my room is 8 x 8 6 plants 400w MH with super sun hood one fan one small heat fan for night to keep my temp above 65 during the day it stay constant at about 78 with about 65-70 % humidity if i keep the heat fan on it the humidity drops to about 42 but heat rises to about 85+ Rating: 5