Windows

Low-E coatings

This is a highly recommended option.

New homes in Manitoba typically use triple-glazed windows. Although adding a low-E coating to one or two layers in a triple-glazed window may not have a quick payback in reduced heating bills, it will have an immediate payback in terms of increased comfort and resistance to condensation. A further benefit is that many types of low-E glazing are also very good at blocking the ultra-violet rays in sunlight that can fade carpet and furniture.

The use of a low-E coating on a double-glazed window can effectively boost its performance to the equivalent of a triple-glazed unit. This may be a good choice in milder climates, but is a poor second choice to a triple-glazed window with a low-E coating for our harsh prairie and northern winters.

Gas fills

This adds only a small amount to the cost of a window and is a good choice if low-E glazing is used.

Virtually all window manufacturers offer gas filling. Some companies have made it standard across their entire product line while others offer it as an option.

Insulating spacers

Don’t overlook spacers. Choosing the right type of spacers for your new windows can significantly reduce heat loss and condensation problems.

In the past, most windows used ordinary metallic spacers around the perimeter of the glazing to hold the layers apart. Today, non-metallic spacers and spacers that use less but higher strength metal are offered by most manufacturers.

These improved spacers keep the edge of the glazing warmer. This reduces thermal stresses and lessens the likelihood of condensation forming which can cause frames to deteriorate or lead to a mold problem.

Frames and sashes

The frame and sash can be a weak link in the overall window unit since today’s high performance glazings are a better insulator than most conventional frame materials.

Frames and sashes are available in a variety of materials (e.g. wood, PVC, fibreglass, aluminum, etc.). Each has benefits and drawbacks in terms of cost, durability, maintenance, insulating value and aesthetics. Good quality windows can be made from any of these materials — use a windows energy rating (ER) to compare performance. A growing number of manufacturers are offering window frames that combine different materials to take advantage of the strengths of each.

Be aware that frames and sashes can have a significant effect on solar gains - up to 30% of the overall area of a small window can be occupied by the frame. Stronger materials such as fiberglass allow narrow frames and sashes which results in more glass area and solar gain. These are called low profile frames.