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What are the U-values of Windows and how do they Save Energy?

Saving on your Heating Bills

We spend millions of Euros every year to heat our homes and businesses. That is why it is so important to understand the role that windows play in how buildings use energy. One of the best ways to measure the effect of windows on building energy use is known as a U-value rating.

The high price of natural gas, electricity, and home heating fuel means consumers are looking at different means of saving on their fuel bills. Many consumers have become more aware of energy efficiency and U-values.

Letting the Light in while keeping your Home Warm

Windows let the light in and allow people to see out but they also interact with their environment. Windows react to outside air temperatures, sunlight, and wind, as well as indoor air temperatures and occupant use.

Windows are strongly affected by solar radiation and the airflow around them. Therefore, the window industry measures the energy efficiency of their products in terms of thermal transmission, or U-value. U-value measures the rate of heat transfer through a product. The lower the U-value, the lower the amount of heat loss, and the better a product is at insulating a building.  Carlson specialises in energy efficient windows that can have U-values as low as 0.61W/m2K

Why the type of Glazing in your Windows matters

U-value takes into account the airflow around the window and the emissivity of the glass. Emissivity is the ability of a product to absorb certain types of energy (specifically infrared) and radiate that energy through itself and out of a room. A product with high emissivity, such as one pane of clear glass, will transfer over 84 percent of the infrared energy from a warm room outside to the cold air. The lower the conductivity and emissivity of the glass, the lower the rate of heat loss and the lower the U-value.

There have been significant technological developments over the last 10 years involving low emissivity (low-e) coatings on the glass. There are now many glass products available with these low-e coatings, which are typically used in double and triple glazed windows and insulating glass units.

To view Carlson's u-Value Ratings click here

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