How Do Energy-Efficient Windows Work?

Posted on August 2, 2018 in Window Installation

How Do Energy-Efficient Windows Work?

At P.J. Fitzpatrick, we’re proud to say that we’ve reduced our carbon footprint by offering materials made from natural resources. Each time we have a window installation appointment that involves our Marvin Infinity windows, we’re more than happy to introduce the residents to the benefits of energy efficiency.

Whether you’re interested in energy-efficient windows or not, you may be wondering just how exactly they work. Our window installation experts are here to explain:

Low-Emissivity Glass

The panes of most windows are made from standard glass, however, energy-efficient windows use panes with low-emissivity glass (also known as Low-E glass) to help block out the sun’s rays. Fewer sun rays will keep your home cool in the summer and warm in the winter. While some windows are single-paned, others are double-paned or triple-paned, and each layer helps to block out the sunlight.  In addition, there are supplementary options for the panes including tints and reflective coatings. When all is said and done, these windows can block out up to 97% of the sun’s rays (as opposed to traditional glass, which only blocks about 20%).


Many traditional windows feature metal insulation, but metal isn’t very successful at keeping heat in or out of your home. In some window models, the metal insulation is replaced with polymer or urethane structural foams, which can expand to insulate better and reduce the rate of heat loss. Other window models feature gasses like Argon or Krypton as an insulation, which also expand and reduce the rate of heat loss. Which insulation is used depends on the manufacturer and the materials used to build the windows. Better insulation also means less window condensation when there are temperature changes.

The Benefit of Energy Efficiency

When warm or cool air is able to escape outside, your HVAC unit will have to work harder to keep your home comfortable, which means a higher price for heat or air conditioning. With energy-efficient windows, however, you’ll not only enjoy a warmer home in the winter and a cooler home in the summer, you’ll enjoy the savings on your energy bills.

If you’re interested in our energy-efficient windows, call our window installation experts today!

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