Hi I am a bit confused. Normal air conditioned room setting of room temp of 22 to 24 C has an average humidity of around 60% RH. Worse when the centre air con switch off after the building close for the day. I wonder what happen to those store selling cameras, lens, etc do when the air con is switched off. I am sure they do not have enough dry cabinet to store all and also the time to do that daily.
I think as long as RH do not goes beyond 60% and of course it is not direct sunlight or too hot, it should be OK. Dry cabinet of course is another level of protection. Any views?