Well... crap..(I did some looking). no right or wrong answer.
I have been getting away with cool air... but Jan and Feb comming up... but wil also be kicking the lights (LED) up when Flowering... So..
Prob. need one of each..

Off to get the cool air... If I need warm... I'll just get another.
getting cheap manual one... to run off a remote digital thermastat switch.