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Importance of Energy Efficiency

An average home may lose up to 30% of its heat or air-conditioning energy through in-efficient doors and windows. This can be due to a lot of reasons, but mostly because of out-dated technology, poorly sealed doors, and single pane windows. Most homeowners are well aware of this after walking into a room with old windows, and feeling the unsettling winter chill. Over the years there have been monumental improvements in door and window energy efficiency technology.

Doors and Windows that pay for themselves

Vinyl Window Cut AwayHere at Discount Door and Window, we have selected products that we have found to be very energy efficient, durable and low cost. All of our windows qualify for a Tax Rebate if you use them to replace old aluminum or wood windows. This is because the amount of energy you save is large enough that the government wants to encourage homeowners to make the upgrade. With this tax rebate, and monthly savings on the energy bill, our retrofit vinyl windows will pay for themselves within a few years.

Energy Efficient Technology

There are a lot of qualities that attribute to how efficient our doors and windows are, but the most distinguishing features are the double pane with argon gas and Low-E technology. Low-E is short for "low-emissivity." It is a high-tech coating on the glass that is designed to block much of the heat and ultra-violet light from the sun, while permitting a large percentage of visible light. Argon-filled double pane glass provides excellent insulation. These technology help keep the warmth in during the winter, and the heat out the summer.

Measuring Efficiency

Thermal Performance for sliding windowWhen purchasing new windows or doors, there are two key measure of efficiency that should be considered. The U-value of a window or door is a measure of heat loss. And the “Solar Heat Gain Coefficient” (SHGC) which measures how well a product blocks heat from the sun. For both of these measurements: the lower the number the higher the efficiency. These numbers are calculated by the National Fenestration Rating Council (NFRC). Our windows at Discount Door and Window have a U-Value of atleast 0.3


If you have old doors and windows in your home, you have a lot to gain by replacing them with higher efficiency products. It will increase the comfort and style in your home, and save you money on your energy bill. Here at Discount Door and Window our goal is to provide you with replacement doors and windows that are affordable, durable, and energy efficient. We also empower you to make informed decisions by providing information, and video tutorials on how to get stuff done in a cost effective way.