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APEX Windows is the leading distributor of vinyl windows. We take great pride in building energy efficient windows using the latest available technologies.

Well designed and correctly manufactured windows should keep heat inside the home during the winter and outside the home in the summer. This reduces your energy related costs, minimizes the environmental impact, and increases comfort in your home. During cooling season, windows are a source of unwanted heat gain. Our windows can significantly reduce Solar Heat Gain without compromising clear views and daylight.

Advanced Glass Coating and Argon Gas

ClimaGuard™ combines eleven optically tuned layers, improving climate control while providing plenty of natural light. 

Silicone Nitrid Barrier
Tin Oxide Optical Filter
Nickel-Chrom Adhesive Barrier
Silver Thermal & Solar Performance
Zinc Oxid Performance Enhancing
Tin Oxide Optical Filter
Nickel-Chrom Adhesive Barrier
Silver Thermal & Solar Performance
Zinc Oxid Optical Filter
Titanium Dioxide Optical Enhancing
Silicone Nitrid Barrier

Argon Gas


Filling the gap between the glass panes with a low-conductivity gas such as argon improves window performance by reducing the overall transfer of heat between the inside and outside of the house. The union of gas and glass firmly stands together to block harmful ultraviolet sun rays and heat transfer, major causes of high-energy costs, faded flooring and condensation buildup.

High Performance Reflective Coatings Glass

Daylight and view are two fundamental attributes of a window. Unfortunately, windows are also the source of significant solar heat gain during times when it is unwanted. Traditional solutions to reducing solar heat gain, such as tinted glazing or shades, mean that the amount of light is reduced as well. ClimaGuard™ with low-solar-gain coatings can provide better solar heat gain reduction than tinted glass, with a minimal loss of visible light. This also means that views can be clearer and unobstructed.


Protection from harmful UV Radiation

The most harmful radiation in sunlight are ultraviolet (UV) rays, which are the most energetic and  responsible for degradation of chemical bonds, leading to faded colors on your furniture, carpets, artwork, and paints. Our glass can reduce UV Radiation by up to 80%.


Winter Comfort

Our windows can improve the comfort within your home by preventing most of the radiant heat created by your heating system from being transmitted outside your home. Poorly designed windows can generate effects similar to a cold draft, even when the windows are perfectly sealed.


Low-performance windows create colder interior glass surfaces, increasing the possibility of frost and condensation. Apex Windows with non-metal Heatseal™ spacers and well designed frames significantly reduce the possibility of condensation under all conditions.


High Performance Insulated Glass Unit Spacer

Most windows are manufactured with a metal spacer in between the glass which causes excessive condensation and heat loss. (picture 1)


Our HeatSeal® non-metal spacer creates a excellent thermal barrier and reduces the transfer of heat and cold into the home. This is the most energy-efficient system and offers lower U-Values compared to other spacers.




The ENERGY STAR Program was created by of the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Energy to conserve energy usage, save money, and protect the environment through the promotion of efficient products and practices.

Most of our products surpass the rigorous requirements of the current Energy Star certification guidelines. By conserving energy, our windows can not only drastically lower consumers’ heating and cooling bills each month but also contribute to a bigger cause - protecting our environment.

For more information about ENERGY STAR® products go to www.energystar.gov

How to read The NFRC Label

The NFRC is a nonprofit organization that provides uniform, accurate information about the energy performance of windows, doors, and skylights. In addition to creating and publishing standards for consistent ratings, the NFRC administers a certification and labeling program to provide the window buyer with accurate product information. NFRC labels on windows allow customers to compare products from different manufacturers on a fair and equal basis.

Compare Product Performance

The NFRC label provides information on how a window performs. The two most important energy ratings are U-Factor and Solar Heat Gain. By reviewing the label information, consumers can make an informed choice about the best product for their individual situation.

A. U-Factor measures how well a product prevents heat from escaping a home or building. U-Factor ratings generally fall between 0.20 and 1.20. The lower the U-Factor, the better a product is at keeping heat in. U-Factor is particularly important during the winter heating season. This label displays U-Factor in U.S. units. Labels on products sold in markets outside the United States may display U-Factor in metric units.

B. Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat from the sun. SHGC is expressed as a number between 0 and 1. The lower the SHGC, the better a product is at blocking unwanted heat gain. Blocking solar heat gain is particularly important during the summer cooling season.

C. Visible Transmittance (VT) measures how much light comes through a product. VT is expressed as a number between 0 and 1. The higher the VT, the higher the potential for daylight.


What are other manufacturers saying?

APEX windows not only outperform competitors in energy efficiency, but also in other very important categories, including air infiltration, water infiltration, and structural integrity during severe weather. Please go to the product section for more information.