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Why MIWD EnergyCore™


The MIWD EnergyCore™ Window System is designed for optimal energy efficiency and high performance without compromising style and functionality. The system’s high performance is derived from a combination of patented AirCell™ PVC frame technology, TMAX™ insulating glass, and a design that incorporates numerous physical barriers against air and water infiltration.

MI EnergyCore Windows are Energy EfficientThe frame is manufactured with a patented AirCell PVC material that is co-extruded and thermally bonded. This creates a fully insulated, corner welded frame that results in superior energy efficiency and strength. The frame is designed to support triple pane insulating glass to maximum residential sizes in any style. Additional strength is achieved thru internal aluminum reinforcements at the lock rails for maximum security.

Numerous air and water barriers are engineered into the panel and frame interface. These barriers include multiple contact points of weather stripping and/or compression bulbs, interlocking meeting rails, and a pocketed sill with a sloped drainage path. These features are designed to keep a home’s interior dry even in harsh conditions. All styles of the MIWD EnergyCore Series have been tested to an AAMA Performance Grade 40 or above.

MI EnergyCore Window System U-ValuesThe MIWD EnergyCore Window System achieves optimal energy efficiency. The frame blocks thermal conductivity at least 6 times better than fiberglass, 4 times better than rigid PVC, and 3 times better than wood.

When we combine the MIWD EnergyCore frame with our high-performance, triple-pane, argon-filled TMAX glass packs, the resulting window exceeds ENERGY STAR® requirements by 30 - 50 percent and meets the requirements for the Department of Energy’s R-5 High Performance Windows Program.

In fact, our window system is so efficient, that our standard MIWD EnergyCore dual pane window, even without argon gas fill, exceeds ENERGY STAR requirements in all zones, in any style and configuration.

The MIWD EnergyCore Window System’s unique design results in a more energy efficient, stronger, more secure, and quieter window with traditional style.

Watch the Why MIWD EnergyCore™ video.