I can't even regulate the heat from mine early in the season. This year I bought a nine-pack from Home Depot, and planted all of them. Some of the plants were WAY hotter than others. I like a little heat - not a lot of heat - and I just don't find the super-hot ones to be enjoyable.
A few years ago I planted a variety called (I think) "Fooled You" jalapenos. They had NO heat at all - and no flavor either. They were pretty disappointing.