What is a good system to go w/? When you hook it up they go right to natural gas setup or you can buy tanks to release. I guess my question is what do you guys beleive to be the best set up for CO2 wer you dont want to have plumbers coming in. I'm aware of the yeast and sugar method but looking for something a little stronger. Building a new room now.

Thermo Plus A/C units are great for sealed rooms because they don't exhaust out if the room is sealed the CO2 runs in the A/C and back out into the room W/O loss.