A full grown ball python can live happily in a 20 gallon long. 30 gallon long max.
You are already having problems with keeping the temps up. Why deal with all the hassle? Trust me, it is going to be a pain in the but t keep temps up in that huge thing.
Technically they can do fine in a 55 gal if they have TONS and I mean TONS of folliage and hides. But temp is really going to be an issue.