The temp is very stable in there. So far it is staying right around 66* during the summer and 63* so far in the cold and the humidity is stable at 70% with the dehumidifier on during the summer and the water tank in there adding to the humidity all year long. I think between the subterranean area and the water tank in there this really helps the room stay stable although it makes the room too humid during the summer hence the dehumidifier. I have just under 400 and a lot more that are ready to bottle.