Personally, if that was me, I'd put the snake into a cloth bag (snake bag or pillow case), secure it shut, & put that bag into my shirt (between 2 shirt layers, most likely).
We're about 98* and your snake will be between you for a heat source and the temperature-lowering room air. It's hard to do this if you have a bunch of snakes, but
with only one, this is what I'd do (& have done in an emergency). At night, the snake needs to be in a crush-proof container, as bcr229 already explained, so you don't
roll over on her in your sleep (& that HAS actually happened before & the snake was killed "mysteriously"-something very difficult for the owner to acknowledge).
Another option is to keep snake in a fairly SMALL insulated "cooler"-type lunch box (& put that inside a larger ice chest), & THEN use bottles of hot water to heat the smaller area inside. Be careful to wrap the hot water bottle(s) & the snake must be bagged as well...you don't want excessive heat either. But I went thru 3 days of an ice storm using hot water, bagged snakes in "ice chests"; I had to change the water in the bottles about every 8-9 hours, & they stayed adequately warm, & never got sick afterward.