Windows
can add beauty and charm to your home, but if you choose them based on
appearance or price alone, you’ll very likely end up paying more than you ever
anticipated. Because those beautiful sources of natural light can allow as much
as 30 percent of your heating or air conditioning to escape, you could end up
paying significantly more on your utility bills each month, making your
inexpensive window purchase anything but a bargain. While energy-efficient
windows do cost more up front, they will pay for themselves in just a few years
with lowered heating and cooling costs.
Understanding Energy-Efficient Windows
When you start looking at the various choices in windows, you may be overwhelmed by the acronyms and unfamiliar terminology you see. Here’s a breakdown of window ratings:
• U-factor: This rating indicates how fast non-solar heat passes through the window. Low U-factor ratings equal better energy efficiency.
• Solar heat gain coefficient (SHGC): The SHGC indicates how much solar energy passes through the window. Lower ratings mean that less solar energy is transmitted, which is good for warm climates. Higher ratings indicate the opposite and would be ideal for colder climates.
• Air leakage: Low ratings in this category mean that air leaks less slowly through the window.
• Visible transmittance (VT): This rating refers to how much visible-spectrum light enters the home. Lower VT ratings mean that less natural light and glare pass through the window.
• Light-to-solar gain (LSG): The LSG refers to the ratio between the VT and SHGC. Simply put, this rating shows how well the window blocks heat gain while still allowing sufficient daylight in the home.
When you start looking at the various choices in windows, you may be overwhelmed by the acronyms and unfamiliar terminology you see. Here’s a breakdown of window ratings:
• U-factor: This rating indicates how fast non-solar heat passes through the window. Low U-factor ratings equal better energy efficiency.
• Solar heat gain coefficient (SHGC): The SHGC indicates how much solar energy passes through the window. Lower ratings mean that less solar energy is transmitted, which is good for warm climates. Higher ratings indicate the opposite and would be ideal for colder climates.
• Air leakage: Low ratings in this category mean that air leaks less slowly through the window.
• Visible transmittance (VT): This rating refers to how much visible-spectrum light enters the home. Lower VT ratings mean that less natural light and glare pass through the window.
• Light-to-solar gain (LSG): The LSG refers to the ratio between the VT and SHGC. Simply put, this rating shows how well the window blocks heat gain while still allowing sufficient daylight in the home.
The Parts of Energy-Efficient Windows
Choosing new windows that help you save on energy costs boils down to two components: frames and glazing. When it comes to frames, aluminum conducts heat quickly and wood tends to contract and expand depending on the weather, making both of them poor choices. Composite, fiberglass or vinyl frames are better at preventing these issues. There are several choices in window glazing to improve the energy efficiency of your house:
• Gas fills: Windows containing gases such as argon can help decrease the U-factor.
• Heat-absorbing tints: Manufactured in colors such as blue, green or black, heat-absorbing tints allow more VT and a slightly reduced heat transfer.
• Low–E coatings: These coatings can be placed on the outside of the window to prevent solar heat from passing through or on the inside to prevent heat from escaping.
• Insulated: Lowering the U-factor and the SHGC, insulated double or triple-glazed windows have space between the panes for more energy efficiency.
• Reflective coatings: Best for hot climates, reflective coatings block sunlight and reduce VT, glare and SHGC.
• Spectrally selective coatings: These coatings allow maximum light to pass through the windows while lowering the U-factor and SHGT.
Choosing new windows that help you save on energy costs boils down to two components: frames and glazing. When it comes to frames, aluminum conducts heat quickly and wood tends to contract and expand depending on the weather, making both of them poor choices. Composite, fiberglass or vinyl frames are better at preventing these issues. There are several choices in window glazing to improve the energy efficiency of your house:
• Gas fills: Windows containing gases such as argon can help decrease the U-factor.
• Heat-absorbing tints: Manufactured in colors such as blue, green or black, heat-absorbing tints allow more VT and a slightly reduced heat transfer.
• Low–E coatings: These coatings can be placed on the outside of the window to prevent solar heat from passing through or on the inside to prevent heat from escaping.
• Insulated: Lowering the U-factor and the SHGC, insulated double or triple-glazed windows have space between the panes for more energy efficiency.
• Reflective coatings: Best for hot climates, reflective coatings block sunlight and reduce VT, glare and SHGC.
• Spectrally selective coatings: These coatings allow maximum light to pass through the windows while lowering the U-factor and SHGT.
Replacement Windows Lancaster PA
If your old windows are making it difficult to keep your home warm in the winter and cool in the summer, it’s time to consider replacement windows in Lancaster, PA. Energy-efficient windows can not only help lower your heating and cooling costs, but they may also allow you to replace your large air conditioning unit with a smaller, more efficient one, which will save you even more money in the long run.
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