
Simonton, installed by XPRT.
Simonton is an American manufacturer known specifically for vinyl replacement and new-construction windows, with a long reputation in the residential market. In an XPRT sunroom, Simonton's windows provide the glass that makes the space a year-round room rather than a screened porch. The brand's focus on vinyl windows — rather than a catalog spread across many products — has earned it a strong standing for fit, finish, and quiet operation.
What distinguishes Simonton is a window-first pedigree and a reputation built on quality vinyl glazing. The line spans the operating styles a sunroom calls for — double-hung, casement, sliding, and picture windows — with insulated, low-E glass and ENERGY STAR-qualified options available. Because the openings can be ordered to size and style, a sunroom can be glazed to suit its exposure and airflow, keeping the operable and fixed windows consistent across the whole room.
Why have XPRT install it
Great glass fails in a bad opening. XPRT frames each window square and to size, flashes and seals it against wind-driven rain, and insulates the surrounding wall so a sunroom holds its temperature through a Texas summer and a January cold snap. Windows set into an unflashed or out-of-square opening will leak and sweat regardless of the brand. One accountable team frames, glazes, and finishes the room, permitted where required and backed by a local warranty.

The lineup
Simonton in the wild
Photography courtesy of Simonton.
Common questions
Simonton specializes in vinyl windows, so its line is built around the durability, insulation, and smooth operation a sunroom needs. The windows come in the operating styles and sizes a room requires, with insulated low-E glass available. We match those choices to how the room faces the sun.
Simonton offers insulated glass with low-E coatings and ENERGY STAR-qualified configurations, which cut solar heat gain and help a sunroom stay comfortable. Glass is only part of it, though — we pair the right windows with proper wall insulation and sealing so the room performs as a whole.
Often, yes. Vinyl windows come in a range of styles and colors, so we can usually specify a sunroom package that reads as part of the home rather than a bolt-on. We will review your existing windows during design and recommend the closest sensible match.