People assume my cooled room is a softer room. It is closer to the opposite, and I would rather say so than let you find out in August.
Heat lies to you about range
In humidity your tissue gives way sooner than your control over it arrives. You reach further, you feel further, and the strength to own that position is still ten minutes behind. That gap is where most avoidable strains happen, and it opens widest on the days that feel best.
A cooler room narrows it. You get the range you have actually earned, at the speed you earned it.
You can hold a position long enough to learn something
Standing poses only teach you anything if you stay in them. In a hot room the limiting factor stops being your legs and starts being your tolerance for being hot, which is a different skill and not one worth training.
Take the temperature out and the pose gets to be the hard part again.
Breathing stays available
Humid air is heavier work to move. Nothing wrong with that, but a class that asks you to lengthen an exhale is asking for something the room is quietly charging you extra for. Cooled air hands that back.
What it does not fix
Hydration. You still arrive dehydrated in August, you still leave more so, and a cool room hides it better than a hot one does, which makes it easier to ignore. Drink over the hour after class rather than all at once on the way out.
It also does not make the first fifteen minutes optional. Coming in off a humid street, your body is still warm and still ahead of itself. Give the early part of the class the time it asks for.
The honest summary
Most of the year in Nayarit, the weather is a factor in the room whether anybody plans for it or not. I took it off the table, and that is not me making the class easier. It removes a variable so the class can be about the practice.