The round shape means the smallest surface area is exposed and thus reduces heat loss from within the home. (idealhome.co.uk)
Storm windows reduce heat loss by 25 to 50 percent, and storm windows with low - e coating that reflect heat back into the room during the winter months save even more energy. (realtormag.realtor.org)
Some research suggests that using slightly more water — enough to cover a baby's shoulders — can be calming and help reduce heat loss. (mayoclinic.org)