Ventalation/Humidity in a small area

I have a very small grow area (about 12 cu ft each between veg/flower) and i'm having problems with heat and humitity. Seems to rum hot and dry after a day after watering but drys out quickly. I have a 250W MH bulb in one and 2 T5 HO in the veg room. I want to make sure i'm not over ventalating and under humidify?

Have you got a hygrometer in your grow room to measure the heat and humidity levels? If not get one! if so, what are the readings?

If heat is an issue then you're going to want to change the air in your grow room 3-5 times a minute (once every 2-3mins if using CFLs) with an exhaust fan and some sort of intake (passive or with a fan).

Probably need a little more info about your setup to make any recommendations.

I have two grow rooms, both 12 cu ft each. I have a fan sucking air out into a filter system which is about 120 cpm. I also have two inlets that are 4" tubing and one has a smal 80 cpm inline fan. I'm just concrned that the MH in this small area is producing too much heat. After watering, it's about 75-82 degrees and 40% humidity. But after a day or so, it can start to get toword 90 degrees and 20% humidity. I don' want to overwater but it seems as long as I water every other day, it's OK. Plus I folar feed alot to cool it off.