I have a just two year old Halmahera ground boa, Sidney, and he's a pretty easy snake to keep, and super handle able and laid back.
I have his cage running on a herpstat, so his ambient goes to 82.5 during the day and drops to about 78 at night. He always has a hot spot available, he has a little shelf under his heat panel, but I've seen him use it as a basking site only twice in two years. For a boa, he really doesn't like it hot. If the cage temp gets over 83 he will bury himself in the substrate to avoid the heat. Other than that he is pretty good about chilling out in the open...I used to have hides for him, but he never used them, so now I just put plants in the corners and he usually goes behind there if he's feeling shy.
As far as humidity goes, that's a tough one. Sid does NOT like to be on even damp substrate, but if I don't keep a moderately high humidity when he's digesting a meal(60-80%),he will get constipated and then have to soak for several nights in his water bowl before he can go. I have him in a pvc cage, so keeping the humidity in that range is pretty easy in the summer. In the winter when I want to raise his humidity, I spray the cage walls and his climbing tree, and the substrate right below the heat panel, and he's a happy guy. In fact if I want to show him off and get him moving during the day, I spray as above and he starts roaming about and drinks off the leaves and cage walls. i do let the humidity drop to 50% for about a week after he poops, just to let the cage dry out some, to no ill effects.
Lighting is 12 on/12 off all year long. Even though he just turns 2 this week, he refused food and roamed his cage constantly during last breeding season (about 2 months), so something to keep in mind.
With feeding I just let him tell me when he wants to eat. He is not a very active snake, so when he starts roaming and tearing up his cage I get the message. He goes about 2 weeks at present, but he's two now so I'm going to start extending it to 3. Because he is such a sedentary snake, I make sure to take him out regularly, but he's still getting a little chubby for a boa lol. He's 24", which is on the long side for a male Candoia carinata, and 124g as of last week.
he has a large water bowl, not too deep but wide, because he does like to soak and poop in there...makes cage cleaning pretty easy. I don't have to change his bedding for up to 3 months, and he's never had a problem with scale or mouth rot. He's a really clean snake...as long as you change the water regularly.
Hope that helps. Good luck with them. I really enjoy my little guy.