Ive been piling the layers under the grobag (2.5) and even putting a blanket and doona on Jesse lately.. This morning Jesse's rooms was at 13 degrees!! Our house is super cold. Ive been wondering about the column oil heater too.. Maybe getting DH to put it on in the morning when he leaves for work at 5am.. but still the whole "heater" idea, even though its a safe one, worries me.