I will never use CO2 tanks myself for multiple reasons. If anything, I would create my own mycelial blocks with a vented hole for respiration but thats because Im familiar with how to do it. Eventually Id like to grow gourmet mushrooms like portabello, shiitake, morel.. but even the mushrooms that substrate produces would be worth more than a $40 brick from ExHale or BoostBuddy.
Its just not going to benefit you the same way supplemental CO2 does. Due to either heat or humidity or both caused by any lighting system, adequate ventilation is almost required. There is about 300ppm CO2 in the air, and plants peak at growth at ppm levels of ~1200-1300. AC and dehumid would work if you can rig a system up for it, but it would cost more in the long run for utility cost and equipment.
Flushing the air out 1x-2x per minute is all you need for your CO2 levels to remain at ambient atmosphere levels. Adjust for humidity, temperature, and CO2 supplementation as needed.
Some folks use carbon filters for stealth grows and this requires constant ventilation. Youll be losing some CO2 in the process, but in my case this isnt a problem because my 'tank' never turns off and doesnt run out of CO2 til its obviously expired.