if you can have your propane tank outdoors, why not a Co2 burner with a Co2 controller and use it for Co2 enrichment + heat? Granted it woul only run while the lights are on (Inless u didn’t run a timer or controller) . You could get your heat + Co2 at like 80-86 during the “on” cycle and then if your limit of heat is beyond what you want have ducting+ in-line fan + temperature controller than w/e it got too hot , result = your in-line fan could bring in ethier outdoor air or your “lung room” . Winter air is a cheap free “a/c” and if you do it that way bs electric and use a propane or natural gas burner that would easily save ya cash and improve your overall results On the environment . I used the, for years intill this current round I switched from intaking and having a server a/c . Now my room became so sealed and it’s running on 2 mini splits . If no Co2 enrichment = my controller will show 0 ppm and while me being in the room and so forth it will go up. Leave and it drops back to 0ppm ( they were def in need of Co2 , would be like you without air) I switched to Co2 tanks with controller and that fixed my problem. If you don’t have a sealed room cause propane needs air to run correctly and willing to have your tank not in your house = safe and would work perfectly
Arrives by Sat, Jan 20 Buy Titan Controls Ares 8 LP, Liquid Propane CO2 Generator, Eight Burner at Walmart.com
www.walmart.com