I had PT for my neck. I hope you get people as great as mine. They were always asking "How's that? Are you okay now?" And adjusting whatever, so I was comfy and not overdoing.
Their motto was no pain is good.
I did not find the clinic too warm - but then, I'm never too warm. One guy was kinda warm, and they turned the temp down and pointed the fan at him. It was spring and still pretty chilly and damp, so not too many people complained about it being too warm.
Good luck, and let us know how it goes.
I have a prescription and hope to go again when I can afford it. Gotta see what the ins pays.