after finding plans online I built a homemade bator, using a styrofoam cooler, having a hard time getting the temp down, ts been holding steady for about 12 hours at 103.5 with 45-50% humidity, the cooler is 8x12"x 13" high, I have a 15watt bulb in the top of the cooler. the light does not have a dimmer on it, would more ventilation lower my temp or would it just drop my humidity level?