Quick Take on Heat Training from GCN.
IMHO it looks brutal, but was effective. Not sure how you’d squeeze it in with normal training though. With a sample size of one, it worked for Connor, so 
@mcneese.chad feel free to delete or merge
I don’t see a reason to delete, and I didn’t do a search for merging purposes since the link above is to a blog article (not a forum thread). I am happy to merge to another forum topic if someone knows that an appropriate one exists.
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The article is 7 years old and kind of brief. I think they are complementary. Just not looking for internal temperature probes. 
That article aside, there are a few existing “heat” related training threads that could be appropriate for a merge.
But I don’t follow this general topic closely, so I don’t know if this belongs under one of those or is unique enough to keep separate.
During work trips I often use a spin bike or Peloton. Last week the hotel gym was easily in the high 70s F. This morning was 70 F. Neither had fans, which is common. Just wearing my summer cycling kit and doing easy endurance was a sweat fest. No thanks to doing that in winter / rain kit. 
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I worked this into my schedule for a while once a week. I would do it first thing, fasted, and usually 1h-1h15, with about 10-15 minutes of tempo / z2 over unders (like 30s at 320w, 3m @ 275w) to get my heart rate up above the endurance zone, then sit at 270w and drop the power as i went on to keep a constant RPE and keep my HR around the tempo - sweet spot rate but power down into low z2.
I hit my best numbers and had a good impact upon my endurance and repeatability during this period (after about 8 weeks of doing this weekly). However; unless you rehydrate (i measured myself losing like 4kg of water mass in one session) religiously throughout the day, it totally throws out your training for a day or two (as if you’d done an interval session). I found it best to do at the end of a 3 day block - e.g. day 1 intervals, day 2 long endurance, day 3 fasted heat + lifting, then a day off for body to rehydrate as well.
Weirdly, I found this a really satisfying session to do. You sort of don’t have to concentrate like you do in intervals, but you still feel like you’re working hard. I felt great after and for the rest of the day.
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The rehydration sounded like a key factor in video was well. Dropping and then rapidly raising plasma volume being that trigger for blood cell production.
Still looks drastic and a chore to get the results.
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I have done a very similar protocol to what is described here
It is effective but not remotely enjoyable.
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