I already sweat like a pig when I do cardio in the summer so I don't need to force more of hot workouts with no air condition right now. At this time of year I'll focus on bearing coldness.
So I will let it feel to cold, by take cold showers, only wear shorts / tank top inside, maybe hot showers sometimes just for a counter effect so one don't get used to just one way. Minimal clothes when going outside is something else I did last winter, just because a habit really. Especially when it is snowy and windy. It makes your body work well when walking cuz you have to keep the heat up.
Thermostat preferably at 67.
Tightening up diet in small increments to make it due on less calories. Even though I'm losing plenty of BF at the moment. I will still eat often, 7 to 8 meals. My meals are pretty small I often get hungry before bed which is a good sign.
Drinking vinegar.
Drinking more water.
Anything else?