While I do not want to contradict @Fishstyx, I can say that my Snapmaker 2.0 is in a basement which tends to be relatively humid and in winter around 10-15 °C. I never had problems with too much humidity in PLA - IMHO the humidity problem with PLA is highly overrated! This video supports my claim:
I even run a 3+ hours print with PVA in that basement, and PVA is highly prone to suck up humidity. But even with PVA I had no problems (here’s my showcase: Tabletop miniature with 0.2 mm nozzle and PVA support (Dual Extruder)). Only the next day, when I loaded different filament into the PVA extruder, the PVA that was still in the nozzle emitted steam and popped with cooking water.
Regarding ambient temperature, PLA is really forgiving, unless you have a drought, which may cause your print to warp. For me, the enclosure of the SM2 (which has much more openings and slits as compared to the Artisan one) is enough to quickly create a warm atmosphere as soon as I have the heated bed at 60°C.
I hear a lot about ABS being a bugger regarding ambient conditions - I yet never used it, so no first hand experience.
The purifier I cannot say anything, I don’t own it. With a garage, would there not be a way to directly vent to the outside?