Energy Savings from Replacement Windows


  • Energy Savings from Vinyl Replacement Windows in Dallas

    How much money can you really save with new replacement windows?

  • Is Energy Savings all hype or is there a real advantage to vinyl replacement windows?


    Do replacement windows really lower the electric bills? The answer is yes. Most homeowners can look for 25 to 50% lower electric and heating bills with new replacement windows. The concept is easy. Since leaky windows allow in heat and cold that fights against what the air conditioner is doing new windows will minimize the work that the air conditioner has to do. It runs less. The climatized air stays in longer and you stay more comfortable in a better environment because the air that is now the right temperature stays in the house.

    Metal builders grade insulated windows have invariably moved around enough that the sashes no longer seal and that allows air infiltration on windy days. The weatherstipping was cheap to start with and after 15 or 20 years it's definately less airtight allowing for heat and air to go around the sashes and into the home and a really big one that few talk about is convection and conduction. The frame itself and the surrounding sill and sheetrock can reach 110 degrees when in direct sunlight even on a day that the outside temperature is only 93 to 95 degrees.
  • Projected Energy Savings from Windows

    This chart shows fuel and electric costs over a year. Fifty dollars a month translates to $12,000 over a decade. Saving just a little money on your electric bill also compounds due to rising energy costs. Saving that $50 a month also becomes $12,000 over the same decade. Another consideration that is seldom talked about is the lessened wear and tear on your current HVAC system. If it works 30% less, it will last 30% longer. A system that has 6 years left in it will last 8 years if it has to work less (using that 30% number). Overall we find that replacement windows can save up to $6000 in just 5 years in an average sized home.

    Savings from New Replacement Windows and lowered Energy Consumption

    The Texas Window Initiative was a joint effort by Texas Electrical providers that encouraged the purchase of new replacement windows for homeowners in West Texas. The problem was potential brown outs and black outs. We are facing those in North Texas in the future as well. In West Texas they had to buy additional power from New Mexico Power and Light in order to accomidate the demand on really hot days and that power came at a premium. The electric companies started the Initiative to encourage better windows to lower consumption and reduce the likelyhood of those brown outs and black outs for the hottest part of the state.

    Estimated Energy Loss from builders grade windows in North Texas

  • Overall replacement windows should pay for themselves in three to five years with Energy Savings and the increase in the home value.

    Plus you get to be more comfortable while you live in the home. Also, builders grade windows usually come up in home inspections with fogged glass, bad sash balances and out of square issues that necessitate their replacement to sell a home. This means many homeowners suffer with terrible windows and they still have to fix them to sell the house and move. That's frustrating. You have to buy windows to sell and never even got to enjoy a well climatized home. You spend the money for someone else to stay comforatble. Also glass replacement doesn't address the long term problems of convection and conduction so just putting in new glass every five years is really throwing good money after bad in many ways. Here's a blog we wrote about conduction of heat through a builders grade window.

    Heat Conduction through builders grade windows.

    How much money do replacement windows really save?

  • The bottom line is that Energy savings is at least 20% in most cases and up to 50% in some extreme cases over the builders grade windows that most people have in their home. Often you have to throw money at it to sell the house anyway so depriving yourself of a decent living environment just really doesn't make sense in most cases. Replacing glass also is a lot like putting new tires on a worn out car. It works better in some ways but not in the big picture.



  • Modern windows have lifetime warranties and it makes sense to upgrade to a quality mid grade vinyl replacement window at the very least if your time to live in that home is three to five years or more.

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