Opinions wanted - Harvey windows
I have to replace my ~15 year-old Rivco double-hung windows (the original windows) - several of them on the 2nd floor have begun to leak, resulting in either a bit of fog or condensation between the panes. Fortunately, the frames are still in excellent shape. I was considering Harvey and have just started to do some research. I was looking for feedback regarding thermal performance and overall opinions of the windows themselves. I will probably just stick with a white vinyl window, but am not sure exactly what model to select yet. Was also wondering about the 'options' they offer, such as foam-filled frame/sash, etc. I'm planning on heading to the showroom in Nashua, NH. to get a better idea of what they offer as well.
Appreciate any info you can provide!