It depends. In most cases, unless you keep your room constantly heated to ~75, a UTH will not be enough to keep your ambient tank temperatures at 80deg. UTHs do not heat the air, just the surface. Most people with aquarium tanks use a UTH and a heat lamp. You could also skip the lamp and use a space heater to heat your room. To keep your humidity up, cover the mesh top of the tank with aluminum foil. I highly recommend you follow this tutorial. It has everything you need to create a great home for your snake!
BTW, if you get a UTH you'll need a thermostat to regulate it.
What are you using to heat your cage now and how are you measuring your temperatures? We might be able to give you more specific answers if you tell us all about your current set-up.
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