Northwest Door Garage Door Replacement in Denver: Three Collections
Northwest Door is the line we point to when the answer is not a standard steel panel. It has one insulated steel collection and two aluminum-framed collections, and the three have little in common except their quality of build.
Planning a garage door replacement? This page helps you narrow the choice. For how a replacement works from measure to install, see our garage door replacement service. If a broken spring is what brought you here, start with garage door spring repair.
The three collections
| Collection | Material | Insulation / R-value | Door warranty |
|---|---|---|---|
| Therma Tech 3500 | Galvanized prepainted steel, three-layer sandwich | 2 in EPS core with thermal break; R-10.4 (U-0.21) | Limited lifetime (rust-through) |
| Modern Classic 7500 | Extruded aluminum stiles and rails, 2 in sections | Optional EPS and insulated glass; R-value depends on glass and panel | Limited lifetime |
| Infinity Classic 7800 | 0.050 in aluminum panels with 6063-T5 aluminum frame | EPS core, 1/2 in; R-5.6 average with insulated thermo-pane windows | Limited lifetime |
Which one
- Insulated steel for an attached garage: Therma Tech 3500. It has six panel designs and 26 window designs.
- Contemporary design with glass and aluminum: Modern Classic 7500, with more than 30 panel and window configurations.
- Carriage-house look with real design range: Infinity Classic 7800, with woodgrain powder-coat finishes, custom arched tops and simulated divided lites.
A note on aluminum
Aluminum does not rust, which matters on streets that are salted all winter, and the anodized and powder-coat finishes are made for high-altitude sun. The trade-off is insulation: glass and aluminum doors insulate less than a steel sandwich, so they usually suit a garage that is not heated, or where the look is the point.
Northwest Door collections we install
Northwest Door Infinity Classic 7800 Collection
The Northwest Door Infinity Classic 7800 is a premium aluminum-framed carriage-house garage door with a 3-layer sandwich construction, EPS polystyrene insulation, and an average R-value of R-5.6.
View detailsNorthwest Door Modern Classic 7500
The Northwest Door Modern Classic 7500 is a heavy-duty extruded aluminum stile-and-rail garage door in contemporary industrial style with 30-plus panel and window design combinations.
View detailsNorthwest Door Therma Tech 3500 Collection
The Northwest Door Therma Tech 3500 is an insulated steel garage door with a 2-inch high-density EPS core, a proprietary Thermal Break, and an R-value of R-10.4.
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Want help choosing the right door?
We measure the opening, talk through how you use the garage, and give you a flat-rate quote for the door that fits.