Windows & Doors

Vinyl windows with Duralite® technology

Beautiful energy efficient windows from National Vinyl.

At R.G. Penfield & Sons we strive to offer our customers the highest quality products at affordable prices. We are always on the lookout for new and improved technologies to give you safer, stronger, better insulated and easier to maintain products.
As a result, we feature vinyl windows from National Vinyl in Chicopee, MA.
National Vinyl LLC was founded in 1984 by Ben Surner and Stephen Fellers with the simple premise to make the best windows at a fair price and provide the best value and service in the industry.
One of the things that make National Vinyl windows a leader in the industry is their Duralite® Warm-Edge Spacer.
All of their vinyl windows are manufactured with Duralite® -- a patented warm-edge spacer. Most window manufacturers use metal spacers to separate the panes in a double-glazed window. Spacers that contain metal conduct heat and cold through the spacer. National Vinyl uses Duralite, an insulating glass edge seal system constructed using a unique Composite Laminating Technology. Duralite creates a create a high-performance durable single seal spacer system.

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