Give 'em a break. They feel the cold more than you.

At home I'm in a tshirt and shorts (hotpants obvs) while my housemate shivers under 3 layers of clothes and a blanket.

At work my desk mate is wrapped up like an Inuit while I'm sat semi-naked peeling my sweaty knackers off my thigh.

Live and let live though, eh?

Vive la difference!

Alternatively, it's not that fucking cold, take some iron tablets and man/woman the fuck up.