Are your windows Energy Star rated for all 3 regions?
Are your windows tested and certified by the NFRC (National Fenestration Rating Council)?
Does your company manufacture their own windows?
Are your salespeople and installers covered under the company Liability and Workers Compensation?
Do you insist on background checks and drug screening of all your installers?
Are the main frame and sashes of your windows fusion-welded?
Do your windows have more than 15 "sealed chambers" or do they have to rely on foam filling for insulation?
Do you offer an anti-mold and mildew weather-stripping or do you use wool pile?
Do you offer more than double pane glass? Do you use Krypton Gas?
Do you have DP (Design Pressure) ratings that exceed 60 which rate structural grade that indicate long term performance of the window?
Will your warranty provide coverage for accidental glass breakage and screen repairs?
Is your warranty transferable without any cost to me?
Do your homework and verify the answers you get!