Are windows a good investment?

[Mitchell Litam]

Simple question which I am sure will not be a simple answer.

Are windows a good investment?

I live in a Pre WW2 Duplex. It is three stories and has a lot of windows for natural light. It is beautiful but costly from all the window quotes I got. There are about 60 windows total.

I currently live in the top and rent out the bottom. The estimate for windows is anywhere from $20-40k for the windows which seems terribly expensive for windows. However, some of the windows in my house do not open and others are starting to break as well.

Now the question. Are windows a good investment? How much would I be able to mark up the rent for just replacing windows? 

Any insight is appreciated since this my my first property (House Hack) Should I get the new windows or better use the money as a downpayment on another property?

If there is any information I am missing please ask and I would be happy to answer