Window frame material determines how a window expands, insulates, and holds up against a 2026 Energy Star 7.0 inspection. Koalaty Windows connects homeowners with vetted local contractors who install and service every major frame material and manufacturer, matching the right product to the home’s climate zone and budget.
Vinyl remains the most common replacement material nationwide. To meet 2026 Energy Star 7.0 codes, vinyl frames must be foam-filled rather than hollow-core. For the most part, hollow-core vinyl is now considered obsolete for high-performance projects. Foam-filled vinyl adds structural rigidity and closes the thermal bridge that hollow chambers leave behind.
Pultruded fiberglass is the 2026 technical leader among frame materials. Composed of glass fibers and resin, it expands and contracts at nearly the same rate as the glass panes it holds. This matters because mismatched expansion rates are what cause seals to snap over time. Koalaty-vetted pros who specialize in fiberglass typically position it as the premium, long-warranty option.
Wood-framed and wood-composite windows remain the standard for historic homes and buyers prioritizing interior aesthetics. Composite variants clad the exterior-facing wood in vinyl or fiberglass to reduce rot risk while preserving a real-wood interior. These frames require more maintenance than vinyl or fiberglass and are typically specified by contractors working on period-accurate renovations.
Aluminum frames offer the narrowest sightlines and highest structural strength, making them common in modern home designs. Because aluminum conducts heat efficiently, 2026 Energy Star 7.0-compliant aluminum windows require a thermal break. This is a non-conductive barrier that separates the interior and exterior frame to hit the required U-factor.
When choosing new windows for the house, the manufacturer of these replacement windows is just as important as their material. The manufacturer determines warranty terms, hardware quality, and parts availability for decades to come. When you work with Koalaty’s contractor network, you will find professional installers certified across the country’s leading window brands.
Andersen is one of the most widely recognized names in residential window manufacturing, with a product range spanning entry-level vinyl lines through premium wood-composite series. Homeowners researching Andersen typically weigh it against Pella and Marvin on warranty structure and price tier.
Pella manufactures across vinyl, fiberglass, and wood product lines and is frequently specified for mid-to-premium replacement projects. Pella’s tiered product naming (with different series covering different budget bands) is a common point of confusion homeowners bring to their Koalaty-matched contractor.
Marvin is generally positioned at the premium end of the market, with a strong reputation for custom sizing and architectural window projects. Homeowners comparing Marvin against Andersen and Pella are usually weighing custom-fit flexibility against a higher price point.
Beyond the three most-searched names, Koalaty Windows has vetted professionals who also install and service Simonton, ProVia, and regional manufacturers depending on the local market. Contractors matched through Koalaty will recommend a manufacturer based on the home’s structural needs rather than a one-size-fits-all brand pitch.
Koalaty matches homeowners with vetted local pros in every region of the country, regardless of which material or manufacturer they’re considering.
Homeowners still deciding between frame materials can compare fiberglass and vinyl performance in more technical detail, or explore full-frame and pocket installation methods covered on Koalaty’s Window Replacement & Installation hub.
For a closer look at how Andersen, Pella, and Marvin compare on cost and warranty terms, see Koalaty’s Marvin vs. Pella vs. Andersen breakdown.
Fiberglass generally outperforms vinyl on long-term durability because it expands at nearly the same rate as glass, reducing seal failure over time. Vinyl remains the more budget-friendly option and, when foam-filled, still meets 2026 Energy Star 7.0 performance requirements.
Each brand serves a different budget tier: Andersen spans entry-level to premium, Pella sits in the mid-to-premium range with tiered product lines, and Marvin is typically the premium, custom-fit option. The better fit depends on the home’s structural needs and the homeowner’s budget, which is why Koalaty matches each project with a contractor who can speak to specific product lines.
In many cases, yes. Koalaty’s vetted network includes contractors certified across multiple major manufacturers, so homeowners can request a quote comparison using the same brand and specification they’ve already been quoted elsewhere.
Warranty terms vary by manufacturer and product line, so homeowners should confirm exact coverage with their matched contractor. In general, fiberglass frames are marketed with longer structural warranties than standard vinyl due to their expansion parity with glass.
Homeowners still deciding between frame materials can compare fiberglass and vinyl performance in more technical detail, or explore full-frame and pocket installation methods covered on Koalaty’s Window Replacement & Installation hub.
For a closer look at how Andersen, Pella, and Marvin compare on cost and warranty terms, see Koalaty’s Marvin vs. Pella vs. Andersen breakdown.