The line that I sell is Richlin which is made by Hayfield in there new state of the art plant that is about 50 yds from the Hayfield plant.
Hayfields contracts with the big distributors prevent them from selling to individual contractors. They started a new company (Richlin) with new state of the art equipment and we buy direct and save our customers the middleman markup. Usually at least $500 or more in savings on a standard size double hung.
They are a more energy efficient window than anything Anderson, Marvin, or Pella make and they carry a better warranty. I can put a custom MN built, lifetime warranty, standard size, Low E glass, dual pane argon filled, with lifetime glass breakage and lifetime workmanship warranty for approx $800. I cannot at that price install just 1 or 2 for you and you would need to be looking at doing at least 4 or 5.
Now a couple window truths, from an honest window salesman.
There are hundreds of window manufacturers because there is so much money to be made on them. The industry joke is the frames are filled with gold.
Windows are holes in your wall that cannot ever be as well insulated as the wall can no matter how much you spend. if you live in an older home with little insulation in the walls the most expensive high efficiency window on the planet will make no difference at all.
The most energy efficient windows are not really very efficient. You can spend $3000 on a triple pane krypton filled top of the line window and get an R Value of about 7 and the cheapest double pane will get you about R3 to R3.5. R value is 1 divided by the U value as listed on the sticker on the window.
If your current windows are drafty you can remedy much of this by air sealing your attic. This will improve the humidity in your home, make your floors warmer in the winter, reduce dust and allergens, minimize cold and hot spots.
There is simply no reason to install new windows to save money or energy because the payback is measured in decades not years. The only good reasons to change them are if they are damaged or you are looking to make a cosmetic change. Any window salesman that tells you that you will save money with new windows is simply not being honest with you.
The stack effect that occurs in a building what causes most window drafts and that can be remedied by air sealing the attic at a fraction of the cost of new windows.
Many new code built homes that are highly energy efficient use cheap builder grade windows but have excellent air sealing done that makes them so efficient.
I know this for a fact because I do code compliance blower door and duct leakage testing for number of new home builders around the state and see the builder grade windows that they are using as well as the great air change per hr numbers they are achieving.