Unless your intake and exhaust fan are perfectly matched, just run an exhaust. Two mismatched fans will actually inhibit air flow and waste electricity.
Your exhaust fan should PULL rather than push air. The duct for the exhaust fan should be high in the room, preferably attached to an air-cooled hood unless you run lights on a separate exhaust loop. A passive intake should be LOW in the room.

High temps + low humidity + intense light are dangerous to a plant.

Light:
The plant transpires and photosynthesizes rapidly in intense light conditions, quickly using up water to form simple sugar by photosynthesis (sugar is a hydrocarbon; water contains a pair of H+ ions. The plant gets the carbon most efficiently from CO2 in the atmosphere).

Temperature:
The plant also cools itself by allowing moisture to evaporate off leaf surfaces.

Humidity:
The plant regulates its water loss and intakes atmospheric gases through the stomata, which are small openings concentrated on the undersides of the leaves. When the plant is trying to conserve water, and closes the stomata, it cannot breathe, and its metabolic systems start to shut down.

What this all means is that when you are running BRIGHT and WARM, you must also add MOISTURE to keep the stomata open, and at temperatures above about 85 degrees, CO2 to ensure that CO2 is not the limiting factor in the plant's metabolism.

When your conditions are COLD, and the plant is transpiring slowly, avoid overwatering, as moisture use/loss slows, and if you want to keep your plants fairly healthy even in low temps, you may want to decrease light intensity as well, because even though they may be able to photosynthesize under bright light, the chemical reactions that take place within the plant happen much more slowly. Below 65 degrees or so the plants become nearly dormant, and may be held in that state only under correct conditions.

It's all connected. Hope that sorta helps.