The SWC is the same way. I started dreading our annual trip to Albuquerque because it was always too hot in the sleeper. Sometimes, I wish the windows would open just a tiny crack because I love fresh, cool air. When I fly, I point the air nozzle straight at my face because I can't stand that "stuffy" feeling. I even have a small fan on my desk at work.
On many foreign airlines it's actually rather rare to have individual air nozzles in coach. Luckily I've had excellent luck convincing numerous foreign flight attendants with shaky English skills to understand that a plane cabin is too hot and get it corrected in a reasonable amount of time. Why I cannot get a similar reaction out of American SCA's with perfectly fluent English is quite frankly beyond my comprehension.
Just the opposite for me. Too cold in summertime due to the air conditioning and just right warmth in winter. I've never felt "hot" in the sleeper an always used the blankets provided to stay warm. I guess "to each his own."'
Well, the big obvious difference is that you can bundle up if you're too cold. What is someone who is too hot supposed to do about it? If the SCA doesn't feel like adjusting the heat then you're basically SOL. There is nothing inside the room that can make it colder than the air blowing in and there is no other practical recourse available to you. You can bring a small fan but if you're really hot it's not going to help much. When you think back to how many hundreds you paid to be uncomfortable it feels even worse. This is why "to each his own" is not entirely relevant in this situation. I still travel Amtrak in the summer because I can bundle up but I no longer risk being miserable without recourse in the winter.