Alpen High Performance Products secured an initial $6 million closing, as part of a targeted $10 million Series B funding round led by Inherent Capital and Arborview Capital.
Alpen High Performance Products closed an initial $6 million of a targeted $10 million Series B financing, led by Inherent Capital and Arborview Capital. The capital is earmarked to scale manufacturing operations and meet rising demand for the company’s high efficiency window, door, and insulated glass unit (IGU) solutions.
What is Alpen High Performance Products?
Alpen, based in Louisville, Colorado, is a long standing U.S. manufacturer of high performance residential and commercial windows, doors, and architectural glass. Founded in the early 1980s (sources cite 1981 or 1986), it has focused for over four decades on climate responsive, energy efficient building envelope products. Its offerings include fiberglass and fiber reinforced uPVC windows and doors, advanced thin glass IGUs (under the AlpenGlass brand), and WinSert secondary glazing systems for existing buildings.
Key differentiators include lightweight triple and quad pane thin glass (as thin as 0.5–1.1 mm) that delivers center of glass performance up to R-15 while adding negligible weight or thickness compared with conventional double pane units. This enables higher insulation without requiring redesigned frames or heavier hardware. The company was an early U.S. adopter of Passive House standards (first PHIUS accreditation in 2013; dual PHIUS/PHI certification in 2017) and holds ENERGY STAR Most Efficient and NFRC certifications on many products. It also supplies IGUs on a third party basis to other North American window and door manufacturers.
CEO Andrew Zech (appointed early 2024 after serving on the board; previously COO of Nuveen Green Capital/Greenworks Lending) has overseen a shift from largely bespoke manufacturing toward standardized, scalable product lines and professionalized commercial sales. Former CEO Brad Begin transitioned to Chairman.
Over the past two and a half years Alpen has grown more than 50%. Sales of WinSert secondary glazing and commercial windows have increased more than fourfold. Drivers include:
- Installation of automated manufacturing lines for thin glass IGUs.
- Launch of third party AlpenGlass IGU sales to other manufacturers.
- Expansion of engineering, customer success, and IT capabilities.
- Strategic commercial go to market focus.
Earlier capacity plans (tied to 2024 funding) targeted a jump from roughly 100–150 thin glass IGUs per day in Colorado to over 1,200, plus additional Pennsylvania capacity. Collaborations such as the 2025 partnership with Corning (using Corning Enlighten ultra thin glass as a center pane) further support performance and scale claims.
Prior capital raises include:
- Approximately $4 million growth capital from Arborview Capital in late 2019.
- A combined ~$18 million in 2024 ($5.9 million DOE grant under the Bipartisan Infrastructure Law/Inflation Reduction Act plus $12.1 million matching private capital) focused on thin glass IGU scaling and manufacturing improvements, with job creation goals in communities affected by coal plant closures.
The current Series B is structured as an initial $6 million closing toward a $10 million target, indicating room for additional participants. Lead investors are Inherent Capital (aligned with sustainability/impact themes) and returning investor Arborview Capital, a growth equity firm specializing in energy efficiency and resource efficiency businesses that has backed Alpen since 2019 and reports substantial portfolio level energy savings from Alpen products.
Use of proceeds centers on optimizing manufacturing, expanding capacity, and sustaining the standardized product and commercial growth trajectory already underway.
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U.S. and North American demand for energy efficient windows is expanding, driven by stricter building codes (e.g., ENERGY STAR Version 7.0 tighter U-factors), net zero/Passive House adoption, retrofit needs in the large existing building stock, and policy support via IRA/BIL incentives and tax credits. Estimates for the U.S. or North American energy efficient windows segment vary by definition but generally point to multi billion dollar markets growing at mid single to high single digit CAGRs through the early 2030s, with residential still dominant but commercial and retrofit segments accelerating.
Windows account for a disproportionate share of building energy loss (commonly cited in the 25–30% range for heating/cooling). Thin glass multi pane solutions address a core barrier to adoption (added weight, thickness, and cost of traditional triples) while secondary systems like WinSert offer lower cost, non disruptive upgrades (documented air leakage reductions up to 97% and whole building energy savings in the mid teens percent range in field studies). Alpen’s dual model (own high performance systems plus OEM IGU supply) positions it to capture both premium brand demand and broader industry volume as codes tighten.
The Series B reinforces Alpen’s transition into a scaled national supplier of advanced fenestration technology. Continued automation, third party glass sales, and commercial channel professionalization should support further volume growth and margin improvement if demand remains strong. Investor continuity from Arborview plus new capital from Inherent Capital signals confidence in the technology’s commercial readiness and the policy/market tailwinds for building decarbonization.
Risks include execution on capacity expansion, competition from larger incumbents adopting similar thin glass approaches, sensitivity of construction/retrofit spending to interest rates and economic conditions, and the need to fully close the remaining $4 million of the targeted round. Overall, the financing aligns capital with demonstrated product market fit and operational progress in a segment central to reducing building sector energy use and emissions.
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