Energy Efficiency

Windows that Perform

What Makes Harvey Windows Energy Efficient?

Energy efficient windows save on heating & cooling costs, but not all windows are created equally.
Harvey Windows are engineered with quality materials and key features to maximize energy savings.



Frame and Sash

Low maintenance Harvey vinyl windows have frames and sashes with thick walls and multiple air chambers. This construction helps the whole window provide excellent thermal insulation. Harvey uses quality vinyl to ensure strength and durability, and their superior energy efficiency gives them an advantage over aluminum or fiberglass windows.


Weatherstripping is another element that adds to energy efficiency by protecting against air leakage. The lower the air leakage, the better the energy efficiency. 
Harvey Windows and Doors low e windows diagram

Low-E Glass

Low-E refers to a special coating applied to a pane of glass. By reflecting infrared light, Low-E helps stop temperature transference. In addition to its energy-saving properties, Low-E glass helps reflect UV rays that lead to fading color on interior furnishings. 


Multiple Panes

Since glass alone is a not a good insulator, older windows with only one pane of glass cause heated or cooled air to escape more rapidly. Two panes of glass insulate much better than a single pane because of the air space between the two panes. Triple pane adds another air pocket, enhancing the insulation value even more. Adding gas between the panes improves the energy efficiency dramatically. 

Gas Fills

Harvey windows go one step further by injecting Argon gas between the panes of glass. Still wholly transparent to the eye, this gas is heavier than air and provides even better insulation. Argon is odorless as well as non-toxic.  

Warm Edge Spacers

Harvey’s spacer system is located inside the window where the glass seals to the window frame. Our u-channel spacer bar is one continuous piece, providing both structural integrity and increased thermal performance. The spacer system offers insulation to the edges of the glass, the area that is most vulnerable to temperature transference.



Air Infiltration Ratings

Lower quality windows lack advanced weather seals and sash-locking technology, leading to excessive air passing through the gaps where the sash meets the frame or around the perimeter of a closed window, otherwise known as a high rate of air leakage or air infiltration (AI).

Home comfort and energy consumption are greatly affected by air infiltration, so make sure you understand and consider this important rating when deciding on which window or doors to install.


How it works

Harvey windows have some of the best air infiltration ratings in the industry, making them a smart investment.

In this video we explain why a good Air Infiltration Rating should be a homeowner's number one concern when selecting new windows. 

The Impact on your Home

When a house has old or poor quality windows, there's a constant battle between the thermostat and the air that's leaking in, leading to wear and tear on heating/cooling systems.

In this video, see what happens to your home's comfort levels (and your wallet) when you have drafty windows.


Understanding Window Rating Values

Energy efficiency ratings shown on a product’s NFRC Label are determined by how well a window or door performs under independent testing for several criteria. Understanding how these ratings indicate a windows energy efficiency can help you make better buying decisions. Values will differ from one manufacturer to the next, and they directly impact the amount spent on heating and cooling your home.




Rating is a value between 0-01

U-factor (sometimes called the transfer coefficient) is a measurement of a window or door’s effectiveness as an insulator. The lower the U-factor, the longer it takes for heat to pass through it, meaning less energy is required to keep inside temperatures comfortable because it’s more insulating. Coatings, such as Low-E, are used to lower U-factor on glass, although they may impact visible transmittance. 


Solar Heat Gain Coefficient

Rating is a value between 0-01

The SHGc rating is the direct measurement of how well a window or door blocks solar heat from the sun. The lower the SHGc the better the product blocks sun-generated heat. A low SHGc is essential in places like Florida, Southern California, and deeper south where this heat can vastly increase cooling costs. However, in colder climates, one might opt for a higher SHGc to utilize the suns heat. A higher SHGc can help save on heating in the colder months. 


Visible Transmittance

Rating is a value between 0-01

The visible transmittance rating indicates how much light comes through a product, an important consideration when buying a window or door.  VT has little to do with thermal ratings, but it does affect energy consumption. The higher this number, the better the window lets in light. A window with a high VT rating will help reduce the amount of artificial lighting needed – and therefore, energy – you consume. Before today’s window glazing techniques a brighter room was usually a hotter one but with modern window glass technology t is now possible to have a very bright room, lit only by the sun, that is just as cool as a dark room elsewhere in your home.



ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy designed to help homeowners save money and protect the environment through energy efficient products and practices. ENERGY STAR Rated products must meet minimum rating requirements for the various climate zones.

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