retics like it on the cooler side of things, but I try to keep ambients above the mid 70's in order to avoid potential digestion issues / RI stuff from popping up. In a house around 65, you'll need either insulation or a secondary ambient heat source in order to keep things where they need to be. Can also consider adding a room heater, depending on what else is going on in that area.
Welcome to the club, make sure you practice responsible ownership. Keep all permits up to date. Keep your snake secure at all times. And enjoy the privilege of owning one of these giants :-) Start a growth thread when you get him home and set up!