Certain types of window materials are better than others. Learn more about window attributes like air leakage, sunlight transmittance, and heat loss by visiting the official Department of Energy energy performance rating database. If you have a good grasp of your options ahead of time, negotiating with your window replacement contractor will be easier.
Window installation companies are in steep competition with each other, and they'll be happy to provide you with bids if they think they'll get the job. Get at least three bids before you make a choice, and make sure that you fully understand your contract before you make any commitments.
Window removal and installation is delicate work. Only partner with window replacement experts who have proven their worth time and time again.
Ask each company you're considering working with for referrals, and when you call prior customers, ask questions regarding timeliness and cleanliness on the job. Lastly, make sure to check out the local customer reviews you can find for each company to get a better idea of who is best to work with.