Features and Benefits of Energy Star WindowsAs a homeowner, you want to ensure that you are buying the best windows for your home. They need to be durable, secure, stylish and most of all energy efficient. It is best to buy windows that are rated as Energy Star windows.

Energy Star rated windows and doors will guaranted that your home is as energy efficient as possible. Windows and doors that are Energy Star certified can help lower your heating and cooling costs significantly.

Why Energy Star Windows Are Beneficial

Prevent Air Leakage

Air leakage occurs when there is a difference on the outside versus the inside air pressure. Air can leak through tiny gaps and cracks located between the window frame and glass. This can cause your heater or air conditioner to work overtime to make up for the difference in the room temperature, which can increase your energy costs.

Energy Star windows Canada are designed to prevent air leakage. In addition, it is wise to ensure that your windows are sealed tightly and have adequate weather stripping.

Lowers Visible Transmittance

The amount of light that passes through a window is known as visible transmittance. The higher than number, the more natural light you are getting through your windows. This can affect your cooling costs during the summer months.

Double or triple pane Energy Star certified windows with a low-Emissivity coating can help decrease the visible transmittance, which can in turn help improve energy efficiency.

Visible transmittance is the amount of light that passes through a window. A higher visible transmittance means there is more daylight coming through your window opening.

Improves Solar Heat Gain Coefficient

Solar heat is that heat that comes from sun’s radiation. This can then be absorbed between the window panes and leaked into your home. It is a great means of providing extra heat during the winter, but can be an issue during the hot months of summer. It can cause your HVAC system to work extra hard to cool your home, thus raising your energy costs.

Energy star windows with a lower solar heat gain coefficient will transmit less heat.


The capacity of a window to resist heat transfer is known as the U-factor. The U0fcator is conducted from the following three means of heat transfer:

Conduction: This is the transfer of heat between substance that have direct contact. The highest heat conductor, the quicker the heat transfer.

Convection: This is the transfer of heat between two points via the movement of an element such as air or water. If the cold outside air meets with the warm indoor air, it can cause a cold draft in your home.
Radiation: This is the heat transfer from infrared rays through the window glass panes. The hotter your surface, the more heat is radiating into your home.

Energy Star windows with a lower U-factor contain higher insulation properties.

When it comes time to install Energy Star Windows, contact WeatherPro Windows and Doors. Our staff can help you choose the most energy efficient windows for your office or home.