If you've already witnessed breeding between the two, I would leave them together until the female doesn't allow the male around her...usually mine will stake out opposite sides of the cage. I typically put my pairs together in October/November and separate them in January/February when the female refuses to allow the male around her and is basking in a piled-up coil under the heat source. Also, she will typically have gone through her post-ovulation shed by this point as well. Other than that, make sure you provide plenty of fresh water, I've found my females drink A LOT when gravid, and proper temps. If she's gravid, she'll be having babies in late spring or early summer. I've only produced one litter so far, in 2000, helped a friend with her pair in 2002 (successful), and separated my pair too early last year so I got nothing. This year I'm expecting two litters, though I'm only really sure about one of the two females I paired off. Ronne's article is a good starting point as well as any other books or articles you can find on the subject. Trial and error is also a healthy part of it.
For what it's worth, I've never cooled my boas unless you count the very slight variations in my home temperature as the seasons change - I'm almost as picky about my habitat as my snakes, and do my best to keep a consistent temperature in the house. lol Best of luck and hopefully you'll be posting later this year about the babies you have.
Raven