Animal Plastics is the way to go. Boaphile cages are of lesser quality, and their customer service is terrible. They won't return your calls and you will be lucky if you can get in contact with them at all. AP on the other hand is extremely easy to get in touch with and is a much better company overall.
How far below 70 does your house get?
A 421D or a T8 really is too small for a full grown RTB, a T12 or larger cage (ideally a T25) would be far more appropriate.
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