Is that vent separate from the rest of your home?
here goes.. Depend on where you live you may need..
Air Condition
Dehumidifier
Humidifier
Heater
Exhaust Fan(s)
Circulation Fans
and that is not including any grow gear. Those few devices can be used to create your lung room. The point of your lung room is to dial in the environment so when you put a powerful (hot) light and a bunch of plaints the temp and RH can be stabilized. If you think you can use your home central cooling/heating, unless the room is zoned by itself it will likely not work how you think
all depending how big you are going and if you want to do it right the first time or not.. If you are throwing a 2x2 in and growing one plant just go for it and pickup gear as you see the need.