The extension seems to lose heat for a number of reasons. The ceiling is knotty pine and fits into the shape of the room so there is little or no insulation under that roof- but I can't tell as there is no way to see into it. I presume the walls have at least some insulation- it was built about 15 years ago and I'm sure it was inspected (in Massachusetts). Some heat is lost to the unheated garage underneath.
So, since I don't know what I can do about loss to the roof or basement- I thought I could do something with the windows, which in the extension are double paned- perhaps I could add storms over the. There are a lot of windows, on 3 sides of this large room (roughly 34x22).
But I've been told by 2 people that it would be a waste of money- one was an energy auditor and he ought to know- the other was an employee at Home Depot who said he took a course on insulation.
With heating oil approaching $4/gallon, would adding storms on double paned windows be that bad an investment?