Frequently Asked Questions

Call Dallas (214) 630-5885 or Fort Worth (817) 731-8886. Estimates are free — we measure, discuss the right line for your home, and leave a written quote.

8808 Empress Row, Dallas, TX — our factory and office. We serve Dallas and Fort Worth.

Since 1992 — over three decades making and installing windows in Dallas–Fort Worth. Thermal Windows is a brand of J&M Glass Company, Inc.

No middleman — we are the manufacturer. That shortens lead times, makes custom sizes practical, and means the company that made your window is the company that answers the phone in year ten.

It depends on glass exposure and budget: vinyl Energy Guard for value and efficiency, Thermalized aluminum for slim strength, fiberglass for premium durability. The estimate visit matches the line to your home — honestly, including when the cheapest line is the right answer.

Call either office number. Window problems a manufacturer can solve — seals, hardware, operation — start with the people who built the unit.

It is our vinyl window line, built around energy performance — insulated glass packages specified for Texas heat. At your free estimate we will show you the glass options and exactly what differs between them.

The combination of insulated low-E glass, a well-sealed vinyl frame and correct installation. Our customer C.K.'s letter (Reviews page) describes an August bill of $154.37 after 60 days of 100+ weather — individual results vary, but sealed, efficient units are the mechanism.

Thermalized means the aluminum frame is built with a thermal break — a insulating barrier separating inside and outside metal so heat and cold do not conduct straight through. It is the engineering answer to aluminum's one classic weakness.

When you want the biggest glass, the slimmest frames, or spans other materials cannot carry without going chunky — modern designs, walls of glass, and commercial-look residential projects.

Fiberglass expands and contracts at nearly the same rate as the glass it holds — so seals are not stressed by Dallas temperature swings the way they are in materials that move differently. That stability is the core of its durability story.

Fiberglass is the premium of our three lines — you pay for lifespan, stability and slim strength. At the estimate we price your home in the lines that fit, so the premium is a choice with numbers, not a pitch.

Casements hinge at the side and crank open like a door; awnings hinge at the top and open outward like a canopy, shedding rain while open. Both compress-seal shut — the tightest seal of any operating style.

Yes — top-hinged awnings are designed for it; the open sash deflects rain while air flows. It is one of the style's signature advantages.

Both sashes move and tilt in for cleaning on a double hung; only the bottom sash moves on a single hung. Double hungs ventilate better (top sash down pulls warm air out) and clean easier — most buyers choose them.

Yes — divided-lite grid patterns between the glass give the classic look with modern cleaning. Patterns are matched to your home's style at the estimate.

Yes — patio doors are a core part of this service, from standard two-panel sliders to wide multi-panel units, built and installed factory-direct.

Insulated and low-E packages are standard options, and laminated security glass is available. In Dallas, the glass spec matters as much as the door — west-facing sliders especially.