Insulate the person , not the room. We just need some high tech but easily wearable NASA style space suit clothing tech- yes including helmet if you want your ears and forehead to be toasty too. The other night ALIEN was on and I'd not seen it in ages ( unlike ALENS that's on all the time ) and in the end sequence , Ripley nipped into a spacesuit in the escape pod system and opened the external doors to nothingness and -270 degree kelvin. The alien eventually got sucked out but she was totally protected from the absolute zero temps by the suit and in reality was quite hot and sweaty due to the absolute scariness of the situation. So , wear a space suit, insulate the person. The domestic dog and the cat have got their own fur suits and they do rather fine with it too.