nope, no heat issuses in either the tent or Cab. The cab runs a lil cooler as the interior space is smaller than the tent and they both are running same exhaust fan (12v about the size of a computer case fan), I need to get a larger one in the tent before switching to DWC instead of E&F. Both 400w lamps are vented directly outside by way of a dryer vent I mounted in the exterior wall. Summer time I do have to leave door to room open and run a box fan blowing AC air into the room but this time of year I can control it just by opening and closing of room door.