An ideal location for montane species would be a basement. Low temps and high humidity. For those of us that aren't fortunate enough to have a basement, you'll have to create a microclimate for them. I house all of my montane species as well as my leaf chameleons in a walk-in closet off of my bedroom. My reasoning for this is that specific room is air conditioned, so I can hold the temp at 70 degrees. I use low wattage incandescent bulbs to keep my basking temps around 80. Keeping them close together in the closet is the key to keeping the humidity up with the a/c trying to suck the moisture out of the air. Fortunately for the chams, my girlfriend and I both like it to be cold while sleeping, so I drop the temps to 65 degrees at night. The a/c isn't always necessary, so it isn't as expensive as you'd think to run all that juice.
Remember the key is keeping the temps low, the humidity high, heavily planted cages and lots of misting.