I find it incomprehensible, but apparently people are getting upset because one of the big UK energy suppliers sent an email to customers telling them if they were worried about the cost of heating their homes this winter they should try cuddling their pets. Or eating porridge.
Both suggestions seem excellent ones to me, and regarding the cuddling proposition, I would like to demonstrate to my canine (and feline?) friends a variety of possible options to help keep your human warm.
Oh, and if sitting on laps is not your thing, why not take your human for a brisk walk, ideally off leash so you can run on ahead, ignoring their calls. They will be well warmed up by the time they've exercised their sprinting muscles to chase after you at speed, and if you repeat this several times, your human will not cool down again until long after you've returned to your chilly home.
I expect my friends will have other helpful suggestions on this topic. Please do share!