The company I went with is local and makes their own windows. They also install them themselves, which I like. They offer a lifetime guarentee (I'm sure only for defects). If any issues, I can just call them to correct. I haver 13 windows (some small, some a little larger) so they are about $500 each installed. This seems a little high but this includes labor and tax. From what friends have mentioned and from what I see online, this is about aveage for vinyl windows. I don't know if there is such thing as a "standard" replacement window... this company builds each one themselves based on actual measurements.
I have 2 windows in my basement that are single pane. I'm sure that cold air was sinking into the window wells and just pouring in threw those windows.
I think my utilities will stay about the same but I think the comfort level will improve. In the summer my electric bill is not more then $120 and usually $60-$80. In the winter my gas bill might go to $80 but is usually around $20. Of course it's normal that I have the AC at 78 in the summer and around 60 in the winter.
The "program" guy that came in was "questioning" my electric bill being at $120. I guess that is because even using that number, his calculations showed it would take 20 years to pay for their cost. He told me he thought my bill was actually probably around $220.
. I just could not see paying $25,000 for their "program". I did install CFL in most fixtures (went with a few hybrids), I'm working on replacing two doors and will also insulate the over hang of the first floor.