@AmeliesUncle wrote:
@Opus 17 wrote:
They would only qualify if they are "a system designed primarily and specifically to reduce heat gain or loss". And if they are such a system (I have doubts) then it doesn't matter if they are interior or exterior.
The OP said these are "plantain shutters", which are pretty similar to blinds. Both are often considered to be primarily to reduce heat gain (at least by the manufacturers; owners usually view the primary purpose as privacy).
I know what they are, I have plantation shutters on some of my windows, installed by the previous owner (mostly the ones facing the front or side, they didn't install them on the back where no one could see). I think they probably do prevent heat gain if closed in the summer (but then the room is dark, do you turn on a light, how does that work out?). Not sure they prevent heat loss in the winter, since you need them open for light. But the key question is do they have a rating in the IEEC code for 2023?
I wouldn't trust anything a window salesman says to me about taxes, nor would I trust my accountant to install windows.
