Did you really just come on here and say that? Congrats that your snake lived poorly for 3.5 years. Atleast the rat did that snake a favor. Hope you do a tad bit more research before getting another.
To the OP
Since space heater has been mentioned. You could try supplemental side heat. A strip of flexwatt running along side the enclosurer from hot side to cool side to help the over all temps.
i guess if you read it and responded i really came on here and said that, ctfd.