How large is the snake? 55 gallons is going to be large to regulate in glass.
I have 2 smaller boas (28in) in separate 40 gallon Glass Tanks.
I plastidipped 3 sides black to help keep heat in.
I purchased corrugated plastic (near the garage sale signs at lowes) and wrapped in tinfoil and aluminum tape and covered the screen
I placed a water bowl directly under the 75W Day Heat Lamp and with these things I am able to regulate by .5 degree and they are thriving.
Just an inexpensive fix to your issue.
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