[MRM]

Look in the lower right hand corner and see if you can find a manufacturer’s bug. Post a photo of it if you can.

I think Bob will find that if he pulls the trim from around the inside of the windows he’ll be able to see into the rough opening and there won’t be much, if any insulation. He can apply a closed cell, low expansion foam into the rough opening to seal all the voids and I think he’ll see a vast improvement. He should try that before buying new windows.