Your snake will burrow under the substrate and end up getting burned if the heat pad it not regulated by a thermostat. Do a google search for burned ball python; it's not pretty. I had a friend who didn't know any better and his kid's ball python died from laying on an unregulated heat pad.
And if if it feels warm to you it could be too hot for your snake; please unplug it until you get a thermostat.
I live in Illlinois and we get cold here too.