Since 1950, Polar Seal Windows has been dedicated to earning the trust of our customers by always providing the highest quality products. Our experience, technology, innovation and leadership in manufacturing vinyl windows and doors continue to set industry benchmarks. Our installers measure your window openings for the proper fit, and, we manufacture your vinyl replacement windows at our state-of-the-art factory in Grand Rapids, Michigan. Polar Seal installers are employees of Polar Seal, not subcontractors. We offer hassle free service. We measure, make, and install ourselves. We provide great direct-from-the-factory savings and we back up our work with the best warranty in the business.- the "Polar Seal No Questions Asked Premium Lifetime Warranty".