Window and Patio Door Energy Performance Evaluation: Tips and Guidelines

Causes, Prevention, and Solutions

How to Evaluate the Energy Performance of a Window or Door?

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In today’s energy-conscious world, homeowners are increasingly looking for ways to improve the efficiency of their homes. One of the most effective ways to do this is to replace old, drafty windows and patio doors with energy-efficient models. But with so many options on the market, it can be difficult to know where to start.

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Understanding Energy Ratings

The first step in evaluating the energy performance of a window or patio door is to understand the different energy ratings that are available. In the United States, the National Fenestration Rating Council (NFRC) provides ratings for windows and doors based on their ability to resist heat transfer. These ratings are expressed as U-factors and SHGC values.

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The U-factor measures how well a window or door resists heat loss in the winter and heat gain in the summer. A lower U-factor indicates better insulation.

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The Solar Heat Gain Coefficient (SHGC) measures how much solar heat a window or door allows to enter your home(Home builder in Greenville NC). A lower SHGC value means that the window or door will block more solar heat, which can help to keep your home cooler in the summer.

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Factors to Consider when evaluating the energy performance of a window or patio door

Frame Material

The frame material can affect the overall energy efficiency of a window or door. Some materials, such as fiberglass and vinyl, are more energy-efficient than others, such as wood and aluminum.


The glazing, or type of glass, can also affect the energy performance of a window or door. Low-e glass is a type of glass that is coated with a thin layer of metal oxide. This coating helps to reflect heat away from your home(Home improvement Greenville NC ) in the winter and keep it cool in the summer.

Window Installation

Proper installation is critical for ensuring that your windows and doors are energy-efficient. A poorly installed window or door can leak air, which can negate the benefits of an energy-efficient product.

Technical FAQs

There are a few things you can look for to tell if your existing windows and doors are energy-efficient. First, check to see if they have Energy Star labels. Second, look for windows and doors that are made from high-quality materials, such as fiberglass or vinyl. Third, check for windows and doors that have multiple panes of glass, as this can help to improve insulation.

The amount you can save by replacing your windows and doors with energy-efficient models depends on a number of factors, including the size and type of windows and doors you have, the climate in which you live, and the energy efficiency of the new windows and doors. However, in general, you can expect to save hundreds of dollars per year on your energy bills by replacing your old windows and doors with energy-efficient models.

In addition to replacing your windows and doors, there are a number of other things you can do to improve the energy efficiency of your home. These include:

  • Sealing air leaks around windows and doors
  • Insulating your attic and walls
  • Upgrading your heating and cooling system
  • Using energy-efficient appliances
  • Switching to LED lighting

There are a number of resources available online and in your community that can provide you with more information about energy-efficient windows and doors. You can also contact your local energy utility company for information about rebates and incentives.


Windows and patio doors are essential elements of any home, but they can also be a significant source of energy loss. Upgrading old, drafty windows and patio doors with energy-efficient models can substantially reduce energy consumption and lower energy costs.

When selecting windows or patio doors, consider factors such as U-factor, SHGC, frame material, glazing, and installation. The U-factor measures a window’s or door’s ability to resist heat transfer, while the SHGC indicates its ability to block solar heat. Energy Star certified windows and doors meet specific energy efficiency standards.

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