This is just an in general question about quarantine...

ATM all the reptiles(expect one, but she's in my older sis's room) are in my room.
One gecko in there I plan to move back to the kitchen since she's not mine, I'm just keeping in there for now.(She's my younger sis's)

But I plan on getting more reptiles soon and never knew about QT when I got into reptiles, so I never did. Luckily, all my reptiles are healthy.
But once I get more reptiles, if I QTned them in the living room, would I be completely unable to take them into the living room?
The other room I was thinking of QTing reptiles in is probably too cold for them...
So should I keep them in completely separate rooms?(I'm not planning on getting more snakes soon, I'm actually going to get more geckos if that helps)