Nothing wrong with heating your spider. A Happy spider = happy owner.

Depends if you want to breed with her, then it is always good to give a cool down period.
I don't think there is a pro way of doing it.
I think it comes down to how many tarantulas you have and space and the most cost effective way.
At the moment I have a small room that my spider and snakes are housed in, and have 2 wall mounted heating panels, and the snakes heating pads.
One of the members built a walk in "box" in he's garage to keep and heat he's spiders.
Some people have whole garages full of spiders where other just use rooms, some members are lucky with location.
One member uses a pantry cupboard with a panel heater for heating.
An old, Ex-member of this forum use to house he's spider on top of the TV or by hes computer.