90% humidity

i noticed my grow box was at 90% when i open it at lights on. my WW is on the 6th week of 12/12. lights come on at 11am. temp drops to about 10c.
so i hooked up my intake and exhaust to run through the night with no change.
im lookin for a home made remedy as funds and real tight
would more heat in the box at night reduce humidity something like a heat mat?
or would a bowl of salt absorb some of the moisture??

im worried about mold

any help would be appreciated cheers

Do you live in an equatorial rainforest or something? Lol.

NO heat mat, add bowl of rice grains ( uncooked) and increase air flow to max possible

get the air flow better

lol just cold and damp ireland. itz in a garden shed!
i just put a bowl of perlite in the bottom of the box,
ill try rice aswell.
i have a heater in the shed but dont realy want to leave it running, it will cost a fortune cos its electric.

whats the ideal humidity for flower?

I think you need to weigh the value of a good dehumidifier against the value of the potential yield.

id add more air flow, it should greater reduce the humidity, add a bowl of something absorbant, like madcatter said add uncooked rice

just had a little look around and there are small dehumidifiers you can get for caravans, cheap too 3euro.
gonna try pick one up today.

do ya think the perlite will work?