dehumidifier causing a lot of heat..

my dehumidifier is working great but the heat coming out of the back isboosting my room temps up about 3 degrees.. is there any cons to having the back of the dehumidifier poking out of my sealed room? will it take away co2.. has anyone tried this.. also i was wondering if the dehumidifier needs that hot air in the room to get the right humidity.. let me know what you think..

also.. i have a 6" vortex cooling my lights.. do you think running a 8" vortex with a 8 to 6" adapter with more cfms through my 6" vented hoods will be a problem if all the ducting is set up in 6" or will it just give the whole system more cfms...