congrats on the results!
I’ve got a bit of hard data for heat acclimatization from last summer. All my training is in the garage, mostly in the afternoon when its hot and garage temps are 90-100F (30-38C). Last August/September during SSB-1 block I found myself doing at least one or two long/low-intensity outside rides on Fri/Sun weekend because I was selling a car. The temp on those rides were typically 95-104F.
After that block was completed I had my best ramp test (vo2max increase), and subsequent training had a clear reduction in heart rate. Anecdotally I was able to do 90-120 minute sweet spot rides without fueling, reflecting a reduction in glycogen usage. At the time I didn’t make the connection to the info in the How to Get Faster with Heat Training podcast episode 103. @MI-XC thanks again for pointing me to that episode!