Assuming that your house is insulated already (because you’re one smart fucking cookie), the next best thing you can do is go insulate a neighbour’s house. There’s probably a grant available, too.
So now when the hottie next to you reads a headline about little old grannies dying of cold, or when some cute Friends of the Earth fundraiser approaches you on the street, you can quietly mention what you’ve done. They will want to do sexy things with you.
You’re welcome.