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Anatomy of Patio Doors With ENERGY STAR® Certification

Thanks to the efforts made by organizations like ENERGY STAR®, finding energy-efficient options for your patio door installation project has never been easier. Benefits like increased natural light, comfortable, stable indoor temperatures and significant energy savings are now more accessible to everyone.

Anatomy of Patio Doors With ENERGY STAR® Certification

What makes patio doors energy efficient? Read on as we take a look at the anatomy of an energy-efficient patio door.

Dual-Panel Glass

The key to an energy-efficient door is proper insulation. Entry doors are typically built with insulated foam cores to prevent heat transfer, the primary cause of increased heating and air conditioning requirements. Patio doors are built differently, as the large glass areas won’t allow solid insulated foam cores. Also, because glass is a naturally conductive material, patio doors face unique challenges in the energy-efficiency department.

Fortunately, Renewal by Andersen® patio doors are up to the task. All our doors feature dual-panel High-Performance™ Low-E4® glass. The airspace between two glass panels eliminates contact between indoor and outdoor surfaces, minimizing heat transfer. This space can be filled with an inert gas that further improves insulation.

Insulated Frames

There are two factors that contribute a patio door’s energy efficiency. The first is the frame material. It should be made of naturally insulative material like wood or a composite with the same properties. The second is build: it must be precisely built so to prevent leaks developing in the gaps between the sash and frame.

Our patio doors are designed with these two factors in mind. Whether you choose the traditional looks of our Frenchwood® French doors or the sleek, modern lines of our Narroline® or Perma-Shield® sliding doors, our patio door frame materials feature superior insulation. All our patio doors are built with precision by our craftsmen in our Minnesota facility and installed by our highly trained crew for optimum performance.

To learn more about our ENERGY STAR-certified entry doors, call Renewal by Andersen® of San Antonio today at (210) 319-7119. We serve many areas in and near San Antonio.


"We were very pleased with the quality of the Anderson windows and the expert installation. This is our second window purchase from South West Exteriors."

Charles Korbell

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