What is the opinion of Reddit about the
PremiumHumidors Moist ‘N’ Aire Electronic Humidifier?

For a walk-in you’re going to need something electronic that has fans with it as well.

Old school tried and true unit would be a moist n air. This would be the entry level for that space. Moist ‘N’ Aire Electronic Humidifier https://www.amazon.com/dp/B001RHVLXA/ref=cm_sw_r_cp_api_i_yAA2DbNGAQ289

Unfortunately you humidify the space, not the cigars so having a small amount in that big space doesn’t save you on the humidifier.

You can also look into cigar oasis but they don’t certify them for that large of a space.