Insulated Storefront IGU (Low-E)

Insulated storefront IGU (insulated glass unit) with Low-E coating — custom-cut for retail, office, and commercial storefronts. Argon-filled, dual-pane, code-compliant for IECC.

Most commercial storefronts built before 2015 are running single-pane glass that bleeds heat in winter and overloads the AC in summer. Swap to a Low-E argon IGU and your HVAC stops fighting the front of the building.

Standard make-up

• 1" overall thickness, 1/4" tempered exterior + 1/2" warm-edge spacer + 1/4" tempered interior
• Low-E coating (Solarban 60 or Solarban 70XL) on surface #2
• Argon gas fill for improved U-value
• Black or stainless warm-edge spacer
• Custom widths and heights, polished edges
• Cardinal Glass or Oldcastle BuildingEnvelope IGUs — manufacturer-certified

Performance

• U-value down to 0.24 (vs ~1.0 for single-pane)
• SHGC tuned to climate zone (.27 for cooling-dominant, .40 for balanced)
• VLT 60–70% maintains daylight
• Meets IECC 2021, ASHRAE 90.1, and Chicago energy code

Common applications

• Storefront retrofits and replacements
• Curtain wall infill
• Aluminum entrance sidelites and transoms
• Commercial office windows

Frequently Asked Questions

Q: How is this priced?
A: $58/sf starting for standard Low-E IGU. Larger lites, custom shapes, and triple-pane upgrades quote higher.

Q: How long for fabrication?
A: 7–10 business days for standard sizes. Rush available.

Q: Can you match an existing IGU?
A: Yes — we identify the original Low-E coating and spacer color and source a match for a clean visual blend.

Q: Shipping?
A: Crated nationwide. Local pickup or installed in Chicagoland (Cook, DuPage, Lake, Kane, Will counties).

Q: Warranty?
A: 10-year manufacturer seal warranty on the IGU; 1-year installation warranty when we install.

Call (708) 800-7120 · Email service@chicagoglasscompany.com · Chicago Glass Company of Illinois, Melrose Park, IL.