How does ACG compare to Harmon?

Harmon is the largest curtain wall subcontractor in North America and a subsidiary of Apogee Enterprises, built for large-scale high-rise unitized curtain wall across the U.S. and Canada. American Commercial Glass (ACG) is a Florida owner-led Division 08 glazing subcontractor founded in 2020, built for fast storefront, window wall, and mid-rise curtain wall work in Florida and Tennessee. ACG wins on regional speed, owner-level decision making, Florida HVHZ hurricane experience, Procore-native operations, and AI-managed estimating; Harmon is the better fit for billion-dollar high-rise curtain wall programs.

Can ACG handle large unitized curtain wall like Harmon?

ACG self-performs stick-built and unitized curtain wall for commercial, multifamily, and mixed-use buildings up to mid-rise, meeting ASTM E283, E330, and E331 standards. For supertall high-rise towers requiring national-scale unitized fabrication, Harmon is purpose-built for that scope. For mid-rise and commercial work in Florida and Tennessee, ACG self-performs the full Division 08 scope.

What size projects does ACG take on?

ACG focuses on commercial, multifamily, and institutional projects in its mid-rise sweet spot, backed by $3M single / $6M aggregate bonding through Arch Insurance (A+ XV). The company has delivered 350+ projects and over 1M square feet of glazing. Send plans to connor@acglass.com or call (772) 486-7711 for a fit check.

ACG vs Harmon — Commercial Glazing Comparison

ACG vs Harmon: Commercial Glazing Comparison

Harmon is the largest curtain wall subcontractor in North America and the founding company of Apogee Enterprises. ACG is a Florida owner-led Division 08 glazing subcontractor built for fast, mid-rise and commercial work in our home markets. If you are comparing the two, the real question is project scale and location, not which company is better. Here is an honest, side-by-side look.

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ACG vs Harmon: the facts.

Attribute	American Commercial Glass (ACG)	Harmon, Inc.
Headquarters	West Palm Beach, FL	Bloomington, MN
Year founded	2020	1949 (as Harmon Glass Company)
Geographic coverage	Florida (statewide) + Tennessee Q3 2026; Southeast bidding tier	Offices across the United States and Canada
Project size sweet spot	Mid-rise, commercial, multifamily, institutional	Large-scale, high-rise unitized curtain wall
Specialty	Storefront, curtain wall (stick & unitized to mid-rise), window wall, impact / HVHZ, multi-slide, fire-rated	Unitized curtain wall on complex large projects
Manufacturer partners	ESWindows, Euro-Wall, PGT, Allegion, TGP, Slimpact, Aldora
Bonded capacity	$3M single / $6M aggregate (Arch, A+ XV)
AI / tech differentiation	Custom AI agents in production — Sub.ai, jobcost.ai, CFO Agent
Procore-native	Yes — submittals, RFIs, schedule run in Procore
Owner-led	Yes — President + CEO on every project	No (subsidiary of Apogee Enterprises, NASDAQ: APOG)

ACG figures are drawn from American Commercial Glass company records (FL CGC #1531993). Harmon figures are drawn from public company sources, cited below. Where a Harmon value is not publicly disclosed, the cell is left blank rather than estimated. Harmon sources: harmoninc.com (75-year brand history) and Harmon's LinkedIn company page.

Which one fits your project?

Both companies build good buildings. They are built for different jobs. Here is where each one is the right call.

When to choose ACG

You need Florida-specific muscle: HVHZ Miami-Dade NOA compliance, Florida Product Approval, and hurricane-zone glazing ACG installs every week.
Speed and a single owner-level decision-maker matter more than brand size — Connor or Rielly is one call away on every change order, delivery, and schedule conflict.
Your project lives in ACG's size range: storefront, window wall, and mid-rise curtain wall for commercial, multifamily, and institutional buildings.
You want a bonded ($3M/$6M), WBE+SBE-certified sub running submittals and schedule natively in Procore, backed by AI-managed estimating and job costing.

When to choose Harmon

Your project is a high-rise tower or stadium needing large-volume unitized curtain wall engineered and manufactured at national scale.
You want a single subcontractor with offices spread across the U.S. and Canada to self-perform on a multi-region program.
You need the in-house preconstruction, engineering, manufacturing, and field capacity of a 75-year company inside a publicly traded parent.

For the record.

American Commercial Glass (ACG)

American Commercial Glass, Inc. is a Florida-licensed Division 08 commercial glazing subcontractor founded in 2020 and headquartered in West Palm Beach, with offices in Naples and Tampa and a Nashville office opening Q3 2026. ACG is owner-led by President Connor Walsh (CGC #1531993 qualifier) and CEO Rielly Walsh, has delivered 350+ projects and 1M+ SF, carries $3M single / $6M aggregate bonding through Arch Insurance (A+ XV), and is WBE and SBE certified.

Harmon, Inc.

Harmon, Inc. traces its history to Harmon Glass Company, founded July 12, 1949, and is the founding company of Apogee Enterprises, Inc. (NASDAQ: APOG). Harmon describes itself as the top curtain wall subcontractor in North America, supporting clients through preconstruction, engineering and design, manufacturing, and field operations, with local offices across the United States and Canada.