I would advise you NOT to get a ball python or other reptile that needs higher temperatures...it's not impossible but will be much harder for you to keep them
successfully, and yes, it would NOT be good to handle them at anything near 50* either.
FYI, snakes brumate at 50* so even snakes that are more tolerant of cool temperatures may give you trouble unless you choose carefully (some Asian snakes
totally require cool temperatures, for example) or unless you really modify the kind of enclosure you use. The best way is a cage within a wood cabinet: wood
is great insulation...you could convert some sort of furniture/cabinet/wardrobe/etc but it would then be awkward to get into for you. As far as safely heating a
snake's cage, the best way is to use a reliable (& not the cheapest!) thermostat to control each heating device (UTH, light, CHE, RHP).
Good for you, doing your research ahead of time. I'm not sure a snake is the best pet for you, given the cold room you yourself need. Even a short time at such
chilly temperatures while handling would make many snakes think it's time to brumate & they might then refuse food. You want to look for species that exist in
the wild at cool temperatures...often they are mountain species...but you then have to make sure you can meet all their requirements as to food etc. Hopefully
we can think of some kinds that might work for you with a little group 'brainstorming" here.