Housing

Display: Boa caging is dependant on boa size. A rule of thumb is a cage measure the boa and the length & width of a cage. As long as the cage's length & width is longer than the boas length, the cage is suitable. To begin with. a single medium sized boa can easily be displayed in a 45-55g. aquarium. Medium sized boas are between 4-6 feet in length as adults. The Nicaraguan, Central, American, Sonoran, and most Island boas fall into the medium sized boa classification.  Small classification boas 1.5-3.5 feet ( sand boas, rosy boas, etc) can easily be displayed in 10-20+ long aquariums. Aquariums must have a locking screen lid to prevent escape.

Breeders: often opt to house their boas in cage/rack systems, which consist of plastic bins or cages being housed on close fitting shelving units or stacked upon each other. Shoe box sized containers are great for housing hatchlings individually. Larger sweater/blanket tubs are used for Juvies, while adults get large stacking 4x2 or 6x2 foot cages . Some breeders even store their boa in large Rubbermaid bins. These are relatively inexpensive and can be found at your local Wal-Mart/Target. The rack method allows you to have many Boas in a relatively small amount of space. The downside is you won't be able to see them or display them in this manner.  

Accessories

    Boas are  nocturnal by nature, which means they only come out at night...the lean and hungry type...sorry a blast to the 80's, they enjoy hiding spots. A water dish large enough and deep enough for them to climb into should they so desire should be provided. For the rainbow boas, place the water at the warm end of the tank to raise humidity levels. Rainbows also need to be kept in a more humid environment, so a plastic, lidded tub, with a hole cut in the side, filled with damp sphagnum moss, should also be provided. Boas, in their natural habitat, would live in a relatively jungle like environment. To be a proper pet to your Boa, it is your responsibility to provide adequate hiding dens. There are many things you can use. 

Dry hides: There are a variety of plastic, wood or stone homes manufactured, which you can find online or at your local pet store. You can also create your own, by stacking flat rocks to make a den - be aware that should you go with this "natural" approach, there is danger to your boa if the rocks were to fall on them. Some people prefer to use terracotta plant saucers with an access hole carved into the lip on one side for babies, and large black plastic manufactured snake hides for the larger adults. 

Humid hides: Should definitely be provided for the Rainbow species, in the manner prescribed above in the general info section. Some BCC may also enjoy such a decadent retreat. 

Heating

    In order to properly digest their food, Boas need to be provided with a "heat gradient". Basically, that means, warmer (84*f-89*f) on one side, cooler ( 72*f-78*f) on the other, with mid temps in the middle. 

Display: Since Boas are nocturnal, no heat lamps are needed. If you must use heat lamps, use the red/black heat bulbs which can be left on all the time without affecting the boas activities. The best heat source is the reptile heating pad. It is similar to that made for people, but it can be much smaller/larger, is made of plastic, and generally has a sticky adhesive on the back so that it stays in place on your tank. It attaches to the outside bottom of your tank. Be sure to place the heat pad at the far end of your tank, to allow the Boa plenty of room to thermo-regulate or get away from the heat when needed. 

Breeders: will generally use heat tape/cable. it is a thin, plastic coated heating device that is attached to a thermostat/rheostat (for temperature control) and placed along the back of the rack or at the bottom back of a shelf that the plastic tub will sit on.