Hi there, mines is just about to bloom here in the UK. It hangs in a western window all the time. The light isn't on there at night so it is basically living in the natural hours of light and dark. We don't have heating on at night at the mo and the temps are approx 10c. This cactus also flowered for me in spring. I water when dry. I do have another one that lives on a stair window and the last time it came into bud I put it in the lounge so I could enjoy it. There are others on here more experienced with these plants but this is what works with mine. Good luck

mark the side of the pot with tape - so you know the direction of the light and when you move it, make sure to turn it, so the light source is in the same direction: otherwise very young buds can drop off (they try to turn towards the light). once the buds are at least 1/2" they hang on much better. but i still do not risk twisting it too much, it'll set the buds on non-light side anyway, just a little later and slower.
i would continue moving it for another week may be, as you have too few buds yet.
72F is ok.
usually, you keep them drier before and after the blooms, but not during the flowering. if it dries up too much it can drop buds.
very generally plants need steady moisture when in bloom.
don't water unless the top of the soil feels dry, but it should not dry up more then 1/3 of the pot (test with skewer/chopstick like a cake test, you'll see where is starts getting dryer, at what depth: you can leave the skewer in the pot and just lift it for a check).
mine is also in the west window in spare room, where it's only natural light. it always sets flowers. i bring it in for viewing only when they really start opening (which takes about 3 weeks?).

This post was edited by petrushka on Thu, Nov 20, 14 at 12:27

Agree with the aboves!

Reliable sources of advice/info:
Auburn University
Clemson University
Paul J. Brunelle

Thank you so much! I had never heard about the buds trying to twist toward the light, so thank you for telling me. And thanks as well for the reliable sources!