proficient way to keep multiple snakes

What kind of an investment would I be looking at if I got a wall of racks to keep snakes....
How do you get them? Aquariums are costly and take up too much room.
What is a more proficient system?
Ideally I would want one wall of racks that slide open.
Not sure either how you would heat them? Space heater?

Way too many possible answers to your question, so I'll just give you some general info. Cost will be determined by how many actual racks you need and where you get them. A rack can be anywhere from a couple hundred for a do it yourself rack to a couple thousand for a large commercially produced rack. Racks usually come with a heat source intsalled, but you usually need to purchase a thermostat seperately, or as an additional cost to the package. Also the heat in most racks is not designed to maintain ambient temperatures within the tubs, so additional room heat may be needed. How big a wall are we talking about? And how big a room overall? And how many of what sizes of slots were you trying to fit?