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Energy Efficiency: U-Factor & SHGC for Doors ExplainedEnergy Efficiency: U-Factor & SHGC for Doors Explained
Gladiator
Vol. IJacksonville, FloridaSunday, August 16, 2026

The Gladiator Dispatch

Doors · Windows · Modern Living — Straight From the Factory Floor

★ Factory-Direct Aluminum ★ 15-Year Warranty ★ Free Insured Shipping ★ Made in the USA ★ Nationwide Delivery
Energy Efficiency: U-Factor & SHGC for Doors Explained
Buying Guides

Energy Efficiency: U-Factor & SHGC for Doors Explained

By the Gladiator Window & Doors Technical Team — factory-direct aluminum door specialists, Jacksonville, FL. Updated 2026. When a contractor or designer asks, "Is this door energy-efficient?" they really need two numbers: U-factor and SHGC. These two metrics appear on...

Gladiator Window & Doors8 min readAugust 15, 2026
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Why Gladiator · What to Watch For

What Sets Us Apart

01
Factory-Direct Pricing
You buy straight from the maker — no dealer markup, no showroom overhead. Watch for "direct" sellers who still route through a middleman.
02
Real Thermal Performance
NFRC-rated U-factors and genuine thermal breaks — not just a sleek frame. If a quote skips the numbers, ask why.
03
Coastal-Grade Aluminum
6063-T5 alloy engineered for salt air and wind load, backed by a 15-year warranty. Thin extrusions are the red flag.
04
Freight Done Right
Insured, liftgate-equipped, nationwide delivery with a Bill of Lading on every shipment. No surprise dock fees.
Latest Stories
Tips From the Floor
The Pro Desk
Tip No. 01
Measure the rough opening, not the old door
Order to the framed opening with proper deduction for shims and flashing. The most common sizing mistake on big panel systems.
Tip No. 02
Spec the glass before the frame color
Low-E coating and the right U-factor drive comfort and energy bills far more than finish. Lock performance first, looks second.
Tip No. 03
Plan the header for wide spans early
A 16-foot opening needs structural support designed in before drywall. Loop your contractor in at the quote stage, not install day.
Coming Down the Pipeline
New & Upcoming
Coming Soon

Slim-Frame Pivot Door 2.0

A narrower sightline, magnetic soft-close, and a concealed pivot hinge rated for oversized slabs.

Arriving Q3 2026
Coming Soon

Motorized Louvered Pergola

App-controlled aluminum louvers that pivot for sun or seal for rain, with integrated LED and a wind sensor.

Arriving Q3 2026
Coming Soon

Black-on-Black Bi-Fold Series

Matte black frames, black hardware, black track — a fully monochrome folding wall for modern builds.

Arriving Q4 2026
In This Issue · Outdoor Living

Define the Backyard. Aluminum Pergola Kits, Engineered to Last.

A patio without structure overhead always feels unfinished. See how a factory-direct aluminum pergola sharpens the architecture and creates a room you'll actually use.

Explore Pergolas →
Keep Reading
Quick Reads
Aug 15
Energy Efficiency: U-Factor & SHGC for Doors Explained
Aug 15
Energy Efficiency: U-Factor & SHGC for Doors Explained
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