Quality Between you and the Elements Thermo Seal began manufacturing vinyl windows in 1997 and we have always focused on building the most durable and efficient windows available all backed with our Lifetime Limited warranty. We service what we sell! We have expanded our product offerings to now include more than 5 different brands of windows plus our own, entrance doors, storm doors, patio doors, French doors, garage doors, vinyl siding, insulated vinyl siding, hardie board, fiberglass siding, stone, shingles, metal roofing, vinyl and aluminum railing, vinyl and aluminum fencing, PVC deck flooring and much more. Please visit our website or stop by our showroom and see many different products on display._