Hey sorry I didn't answer this earlier but I have had a busy couple days. Yes you would still need your heat sources, especially if your going up in size of enclosure. You may even need to up the wattage of the lamp because now you will be heating a larger area. But that you wont know till you have the bigger enclosure and are able to see if you will be ok or not. And for the if I got a hygrotherm would I still need the lamp the answer would be yes again, it doesn't create heat its just a really high tech thermometer that keeps everything in check for ya IMO.