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How Much Can Replacement Windows Save On My Energy Costs?


It’s a very fair question to ask how much you can expect to save on your energy bill by replacing your windows. After all, the benefits must necessarily outweigh the cost, or it wouldn’t be worth the investment. Well, there are many factors are involved in determining the energy savings you will see when you upgrade the old windows in your home to energy-efficient windows.  I have been in this business for 18 years and have seen savings vary, but everyone saves a significant amount.  Out of the last 4,000 window jobs that I have been involved with, I have had clients tell me they have saved 26%, 33%, 52%, and so on.

There is no doubt that you will save money on your utility bill by installing insulated replacement windows.  But exactly how much is a very tricky question.  Let’s focus on some of the key factors involved that will change your energy bills.

Type of Window: Before and After

Be sure to compare:

  • U values and Solar Heat Gain Coefficient ratings of the window (see the National Fenestration Rating Council website)
  • Material used in the frames of the windows
  • Window installation methods

Most of the savings on heating and cooling will depend on the difference between the energy-efficient characteristics of your old and new windows. For example, let’s say your home has old aluminum single-pane windows, as do many in the San Antonio area.  Your current windows do not insulate your home well, so if you upgrade to gas-filled, double-pane windows with non-conductive frames, you will see very large utility savings.  However, if you upgrade when you already have double-pane vinyl windows, you will still see savings, but not as drastic.

Architectural and Landscaping Considerations

  • Amount and size of windows (total square feet of glass in the entire home)
  • Placement of windows (i.e. west or south walls)
  • Shade around the home from trees or other buildings
  • Glass that is covered by a patio or 36” overhangs

How light and heat enter your home can determine how much you can save on utilities by upgrading your windows.  For example, if you have no trees to block the sun and many large windows on the south side of your home, with no eaves or overhangs, energy efficient windows will reduce

your cooling costs in the summer significantly.  If you have windows on the west side where the setting sun shines into your dining room at the end of the day, upgrading your windows will make dinner much more comfortable. In comparison, if you have a porch or deck with 36” overhangs or a patio cover, which protect from the sun, replacement windows will have less of an impact.

I have had clients brag about rooms in their home that they can actually enjoy using again after getting new windows. New windows that block UV rays can also keep your carpet, floors, and pictures from fading out in rooms that get the most light.

Your Utility Habits and Other Factors:

Look at:

  • Where you set your thermostat
  • Age of the air conditioning unit in the home
  • Amount and type of insulation in your home

How do you use heating and cooling in your home?  If you like to keep your home a much higher or lower temperature than the outside world, high-end windows will help you do this at a lower cost.  With new windows, your air conditioner will run less, which will add more life expectancy to your system.

Even though there is no set scientific formula, it is easy to see that some people will save more than others when installing replacement windows, but everyone will certainly benefit from them.  If you choose a high quality window and have a well-qualified, professional, experienced installer install the windows, you can expect a minimum of 25% and a maximum of 52% savings on your energy bill.  For example, you may spend $10,000 on replacement windows but end up saving around 40% of your annual $3000 energy bill, amounting to a savings of $1200 a year. Not only will your savings end up paying for the cost of the windows, but more importantly, you will experience a more comfortable home with enhanced beauty and value. You will also have a greater appreciation for your home and will want to show off your new windows, and probably brag to your friends and neighbors about your magically reduced utility bills.

If you have any further questions about windows and energy savings, please feel free to contact us directly.




Category: Personal Finance

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