I notice that even those who are saying they do not cool, are still getting natural temperature drops due to seasonal variations (at least on the cool ends of their cages). Though this may not seem like much, it is enough, in most cases.

I drop my heat tape temps from 90 to 82 in October, and raise them back up in March. Along with the natural ambient seasonal drop in the snake rooms (winter low about 70 degrees, Summer is low 80s), this provides a powerful cue without any significant risk of respiratory infections (out of 100 adult balls, NO RI in the last two seasons).

While barometric pressure drops are a powerful trigger for copulation, in my experience they will not, by themselves, ever lead to successful reproduction.

Light cycle has been shown, time and again over many years, to have little or no effect on boid reproduction (see Ross and Marzec's classic "Reproductive Husbandry of Boas and Pythons" for an early and thorough explication).

Temperature drops are he way to go folks!