First of all, 30ft x 30ft sounds absolutely huge! Maybe you meant 30 square feet? If you’re not printing non-stop and can open a window from time to time, PLA should technically be fine from what I’ve read, although a well ventilated room would always be best.
As for the printer itself, I personally would advocate against Creality products. I would trust a Prusa MK3S with my life, but it is on the pricier side. I’ve read good things about the Sovol SV06 (not the 7), which looks like an MK3S at 1/3rd of the price. Can’t speak from experience though.