There are heaters that auto shut off if the temperature of the tank gets too high and it will auto kick in if it gets too low. I've recently bought one for Dixie (my betta) and it makes me relax during the school day to know that my betta will be alright at home alone. However, I can't tell you if you'll need a heater because I'm one of the newer members in the betta world just like you. I'm glad that you chose to add a betta into your family because they're very exciting creatures with different personalities and they have several tail types. It'll be fun finding the betta fit for you, but don't rush it because choosing your forever friend should be something you're very specific about. You want to observe and make sure there's no illness or deformities in the betta you're interested in or you could overwhelm yourself. Well, it was nice meeting you and remember that everyone on this forum enjoys pictures of bettas. (It'd be great if you would post pictures of yours when you get it.