I used to sell and install replacement windows, but no longer do (got old, me not the business). I also own a duplex rental unit, in an upscale neighborhood. Last year, I had all the 1960's windows (whole duplex) replaced, had it all sided and a new roof put on. I did the windows to make the place easier to heat even though the tenants pay the heat. I did it because the new insulated windows (Renewal by Anderson) are a huge step up in quality from the old 60's insulated windows.
I won't suggest who you get them from, get 3-4 prices, throw out the low one and make a choice from the others. The high price is not always the best unit, but most often the low price, especially if it is significantly lower is not a good buy.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.