I beg to disagree. I have a new, custom built, triple-glassed, very well insulated home. We moved in Feb before we got our heating pump installed. The house was

I beg to disagree. I have a new, custom built, triple-glassed, very well insulated home. We moved in Feb before we got our heating pump installed. The house was at 15 degrees, with portable heaters often on. Sun shining thru, oven usage and said heaters couldn't keep it warm.