By: Harland Wilkes of sunrisewindow
Buying windows is an investment in your home and good ones are not cheap! But they will save you Energy and Money and will keep you and your family comfortable for years to come. When choosing windows, consider not only initial price but also the warranty, Energy Star qualifications, maintenance
costs and the quality of the company selling them.
A respected builder I know told me how he learned the true value of energy-efficient windows. In the course of his business, he installed a builder’s line of windows from a well-known manufacturer in every house he built. He felt good about his choice; he purchased the windows from a manufacturer with a reputation for quality, but they cost 10% less than another manufacturer’s line of low-E, argon-filled windows, saving him about $600 per house. He even put them in his own new home. The first winter he lived there, though; he noticed that the windows seemed cold. Only then did he compare the U-values and Energy Star qualifications with the manufactures windows. He did some math and concluded that his windows were costing him about $150 a year. By his estimation, the other manufacture’s windows would have paid for themselves in four years and made his home more comfortable for their entire life span.
My friend based his conclusions on widely accepted averages, and although certainly not exact, they were probably not far off the mark. Experiences such as his common, yet they are easily avoidable with a basic understanding of how energy-efficient windows work. When you choose new windows, appearance is often the first consideration. Initial cost is the next issue: Which window within the favoured style costs the least? But liking a window’s appearance is a fuzzy proposition, and cost really depends on durability and on the energy dollars pumped through the windows each year. I am convinced that if we could see energy loss as we see color and shape, energy performance would top the list of window considerations.
Windows are thermal holes. An average home may lose 30% of its heat or air-conditioning energy through its windows. Energy-efficient windows save money each and every month. There are even some cases where new windows can be net energy gainers. The payback period for selecting energy-efficient units ranges from two year to ten years. In new construction, their higher initial cost can be offset because you’ll probably need a smaller, less expensive heating and cooling system. And more-durable windows may cost less in the long haul because of lowered maintenance and replacement cost. Plus, you’ll be more comfortable the whole while you live with them.
Basic’s of Buying Energy Efficient Windows
The replacement window industry is highly competitive, which can breed bad operators- all the way from the salesperson up to the company itself. Here are basics of buying energy efficient replacement windows.
What is ENERGY STAR?
ENERGY STAR is a voluntary Canadian energy efficiency initiative that helps consumers identify the most energy efficient products available. Administered by Natural Resources Canada, the ENERGY STAR program is internationally recognized and users include various levels of government, public service companies, manufacturers, retailers and environmental organizations.
In addition to administering the program, Natural Resources Canada oversees the promotion of its symbol and compliance with strict certification standards. ENERGY STAR qualified products include home appliances, office equipment, lightning and signage equipment, commercial and industrial products, and windows and doors.
How Does It Work?
- Canada has been divided into four climate zones.
- The climate zones for which a window, door or skylight is ENERGY STAR qualified will be shown on a
label or on its sales literature.
- Simply choose a product model that is qualified for the climate zone that you live in.

In general, all ENERGY STAR qualified products, not just windows, are amongst the top 20% for energy efficiency of all products of their kind in the marketplace. The ENERGY STAR program has divided Canada into regions according to climate and has four performance levels – A, B, C and D. The better a window performs the more regions of Canada a window will qualify for. A label that lists a “D” rating indicates the highest energy savings and can be installed anywhere in Canada. Again manufacturers don’t necessarily get the same rating on all the products they make, so it pays to insist on seeing the ENERGY STAR label on an actual sample of the product and style you are considering.
What is Low-E glass?
Low-E, or low emissivity glass has been coated with low-emittance material designed to reflect heat. A window made with low emissivity glass repels ultraviolet rays that cause heat during summer months, but absorbs them and lets the heat in during winter. This type of glass can help you significantly lower your energy bills all year long.
What is Performance Energy Rating (ER) and the U-Value?
The U value measures the transfer rate or the thermal conductance of a product. The lower this value is, the more isolating value of the product is.
The energy performance rating assesses a window based on 3 aspects; the solar heat gain contribution, heat loss by the frame, the glazing or the spare and the heat loss by air leakage, no matter the material and the assembly method. Also, the higher the ER value of a product is, the better its energy performance.
In order to get the ENERGY STAR sign on a product, the U or the ER values must be certified by a third party.
Know Your Window Warranties
Durable, well-made windows from reputable window manufacturing companies have good warranties for their products. Chances are, the better the warranty is, the higher the quality of the windows. Check for the warranty that comes with your house so you can get refunds or replacements if your windows do not live up to the sales pitch.
Sunrise Windows and ENERGY STAR
Although they don’t actually use energy, windows and doors can be a major source of heat loss. This is why more and more Canadians demand high performance windows and doors that meet ENERGY STAR standards. By considerably lowering energy costs, they represent substantial savings while providing comfort to your home or building. In addition, they help reduce potential condensation and attenuate
outside noise. For all these reasons, Sunrise Windows is a proud member of the ENERGY STAR program in the window, sliding glass door and entry door category. This program ensures that energy performance are tested by a laboratory accredited by the Standards Council of Canada.
You can be sure that all Sunrise Windows products bearing the ENERGY STAR symbol are ideally designed to withstand all Canadian weather conditions.
For more information about Windows & Doors see www.sunrisewindow.ca and request the CD – “Sill to Sash”.