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Windows

One stuck sash or every window on the house. Call with the count and the city.

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New units in existing openings, including insert replacements and full-frame replacements.

How U-factor, solar heat gain, and air leakage are labeled, without a promised bill change.

Which NFRC numbers are you quoting: U-factor, SHGC, and air leakage?
Are those numbers for the whole unit or only the glass?
Does the bid rely on a utility rebate, and what happens to the price if the rebate is denied?

Flashing, shimming, insulation of the gap, and how the opening sheds water.

How is the sill flashed, and is the nailing flange integrated with the weather barrier?
What insulation goes in the gap around the frame?
Is a lead-safe work practice required for this house?

Hardware, balances, sashes, and fogged insulated-glass units.

Insert replacements are faster and leave the old frame in place. Full-frame replacements expose the rough opening, which is useful when the frame is rotten and wasteful when it is sound.
A lower U-factor means the unit resists heat flow better in the rating test. It is not a promise that your utility bill will fall by a specific amount.
Ask who warrants leaks at the flange. Many glass warranties exclude installation.

How many windows, which rooms, and whether the frames are soft. We'll take the rest.