The sellers had put in triple pane windows throughout and it helped a lot.

It might be worth paying a professional to lessen the strain on your friendship in the event they don't hold up their end.Good luck!

One could gt a vinyl window, one pane (I think they call it picture window or something like that) with privacy glass.

It isnt fun when your net worth drops on paper but if you are positioned for long term holds you don't feel any real financial strain.

Most likely the wiring in the fuse panel is not to code either so all of that has to be corrected.  

That could cause a financial strain with an investor that has a more fixed income and is not prepared for the interest rate to jump up? 

The double-pane window seals are worn and the windows fog in between the glass (I understand this is not uncommon). 

Add solar panel. I

Just to give you an insight, for the aluminum wiring and electric panel, I was able to get seller concession for this item, approx $7k, which work ended up being $5k to get electrical up to code.

The house is on a corner lot and the seller purchased the home to renovate for his mother to live in but started to take too long and it was straining his marriage so his mom moved out of state and he is selling to save his marriage.