Depends on what type of enclosure you're keeping it in. How low does the temp drop? Heating pads are normally just for belly heat but not so much for ambient temps.
If it's a glass tank with a screen top they are a pain for keeping temp and humidity up. I'd suggest getting a ceramic bulb. Heat without the light. Lamps tend to dry out the air so make sure your humidity is at healthy levels still as well.
And congrats on the new snake.