too much humidity although temps fine

Hey guys and girls...got a aquamist, 3 soil buckets and 1 ebb and flow system..heat seems to be maintaining for now but humidity climbs high as hell at night and early mornings.....I have a small space ( 360 cubic feet)....don't want a de-humidifier since they put off heat themselves and I am running out of room to put anything anywhere else. Thought about an ac but don't need the cool air it will bring while helping humidity and don't want to vent that either...any cheap resolutions? Already got a total of 1075 cfm's exhausting..overkill for my space room but need it because making up for no intake...whatcha all think?????? Temps are maintaining between 70 and 80 degrees and humidity can climg to a whopping 75.....

First of all which phase are you talking about. If that was in the vegetative state that would ideal. Now if you are flowering 50-60 RH is ideal. Please specify before you ask for solutions.

no intake why. where does it get fresh air from?

I have no way to intake and so I was told to go with ALOT of exhaust and oscillating fans to make up for...everynow and then when humidity or heat is high..I can open a door to a room that has some ac...but rather not. I am in the seed stage...just planted seeds maybe a week ago...the aquamist ppl told me to use hydrobeads and 18 hrs lites on...the pots with soil....I am told to use 18hrs of light until germination and then never turn lights off until later....then I have an ebb and flow with rockwool surrounded by spagnum moss....almost all of the ones in ebb and flow have sprouted...only 3 out of 30 has sprouted so far in the aquamist and 1 out of 2 soiled sprouts have come through...I have been doing 18hrs on and 6 off but now that SOME of them have sprouted do I stay on the 18hrs with 6 off for now...and do I worry about high humidity or not until after they all germinate please?????Thanks for anything you can offer

pictures? is it in a sealed room. if so your killing the fan not having an intake, makes it work to hard.
dosn`t matter what type of grow you use for lights.i use 18/6 all the way from first signs of green growth or when put in soil, then to 12/12

Thanks bonz..I think you are right bout the intake but gone too far now on this one to turn back now...gota make this one work and then fine tune and make things much better the 2nd time around. So I will stay on 18/6 as suggested and hope for the best. One thing I am hating about the hydrobeads is that it seems such a little bitty seedling has to work and worm its way though the beads which seem to have some weight to them if there are a bunch over the seeds to begin with..they are taking much longer to come through....

never used them. i am stickley organic soil or soilless.
the intake dosn`t have to come from outside