By Canada. Office of Energy Efficiency.; REIC Ltd
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Additional resources for Consumer's guide to buying energy-efficient windows and doors
34 - - Fig. 35 - 28 - There are now many different Fig. 36 types of low-E coatings with different performance characteristics. Northern low-E coatings are probably your best compromise in a heating climate like Canada’s. They maximize solar heat gains and reduce heat loss at night. Solar control low-E coatings might be justified on westfacing windows when no other means of solar control is possible. These reduce solar heat gain as well as visibility, and are often tinted. In most cases, the consumer has little control over window location, especially in an existing home.
On steep roofs, an operable roof window can provide many of the features of a good quality vertical window, including the ability to ventilate (Fig. 45). Roof windows can also be equipped with blinds to reduce unwanted summer sun. 37 Fig. 1 Shopping Checklist Take this handy checklist when you go window shopping and ask the salesperson to show you the energy and other performance ratings. Window Shopping Checklist Performance results ❑ IGMA label present on sealed glazing unit ❑ CSA-A440 compliance ❑ CSA air leakage level (recommended minimum A3) ❑ CSA water penetration level (recommended minimum B3) ❑ CSA wind load level (recommended minimum C3) ❑ CSA condensation resistance (optional) ❑ CSA forced entry (optional) Energy performance ❑ Energy Rating (ER) number ❑ ER: -11 for operable and +2 for fixed are good levels to aim for Resistance to wear and tear ❑ Maintenance-free materials ❑ Joints well sealed ❑ Easily operated, well-balanced mechanisms ❑ Strong, durable hardware Style ❑ Meets aesthetic needs ❑ Suitable for size and orientation ❑ Non-operable except for code or ventilation requirements Price ❑ Three quotes for product and installation (site estimation) Warranties ❑ Installation: minimum 90 days ❑ Sealed glazing unit: minimum five years ❑ Window: minimum one year 38 In northern areas, consider durability and operability under extreme conditions.
38 While these films are effective in certain applications, you need to be sure that both you and the window supplier or manufacturer select the right film for the right application. Researchers are working on exciting new categories of smart windows – electrochromic, thermochromic and photochromic – referred to as “switchable” glazing. The most promising are electrochromic films that allow the amount of sunlight passing through windows to be controlled by means of a small current running through a transparent electrolyte layer in the window.