I currently house a trio of Pygmy Chams in a wooden viv. I understand larger chameleons like the air flow etc, but I think the wooden vivs hold the temperature better. If I had a mesh viv in my house, my 2 year old boy would probably kill the chams unless the really cold temperatures killed them first. The room my vivs are in,is 2 rooms which are open plan, so quite large and are very difficult to heat with the radiators we have. The rooms are only warm if the fire is on, but don't really want the fire on forever,lol