In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Is envelope heat loss linear to inside/outside delta T?
I have a heat loss calc that says 10 btu/hr per square foot at interior temp of 74° and design day of 36°, an inside/outside delta of 38°.
If it's half that, ie, outside is 55°, presumably I need half the btu input at 5 btu/hr?