Need opinions. 🤔

We have a 2 (will be 3) year old, a 4 year old and due in December with boy #3. For the first 6 months at least I plan on the baby being in our room with us, but I’m unsure which room to put him in after that.

Would you have the baby share a room with the younger or older sibling? We attempted to put our 2 boys in the same room and it has not went over well. Lol. I’m leaning towards putting the baby in a room with our 4 year old because our 2 year old is an absolute monkey and gets into everything. (Climbs on furniture, etc) but I’m also afraid my 4 year old will attempt to get baby out unassisted. 😕 I’m at a loss! Any advice?

Side note: We do have 3 rooms (plus our own) but our third room is not temperature controlled (it gets hot in the summer and cold in the winter, we have a window unit in there but have nothing to keep warm in winter) so we don’t want any of the kids in that room.