Using R-Values and U-Values to Measure an Insulated Window Blind’s Effectiveness Against Hot and Cold

How Do R-Values and U-Values Come into Play in Rating the Energy Efficiency of Insulated Window Blinds?

 

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Both U-Value and R-Value measure energy efficiency. Here are the main differences in a nutshell:

  • U-Value (also known as the U-factor) is a measure of heat transfer (heat gain or loss through glass), while R-Value is a measure of heat resistance. U-value is not a material rating; it is a calculation of the conduction properties of various materials used in the construction of windows, doors and skylights.
  • R-Value measures the performance of a specific material, such as insulation, based on the material’s ability to reduce the transfer of heat.

U-Value is a scientific calculation that measures the rate at which heat flows through 1 square foot of material; it measures how well a product keeps heat from escaping a building or home. The lower the U-factor of a window, the better it is at reducing heat transfer; that is, less heat will be lost. The U-factor refers to the energy efficiency of the entire window assembly, less, it is considered to be energy efficient. U-factor performance is especially important in how it impacts energy efficiency during the winter heating season in colder climates.

R-Value, on the other hand, is a material property value: It measures a material’s resistance to heat flow, which is important in the rating of insulation used in your windows, for example. It measures the rate at which heat is transferred or lost and is based on conduction and resistance. A high R-value indicates better insulation and resistance to heat transference.

R-value (also known as the R-factor) is relevant in terms of window blind insulation used to cover the window’s glass. The higher the R-value of any material, the greater the insulating value. It’s important to understand that when it comes to windows, U-value takes more than conduction of heat into consideration. It also considers airflow or convection around the window and the amount of radiated or reflected heat off the glass.

Triple Pane Windows Have Lower R-Value & Cost 300% More

Triple Pane Windows have a maximum R-Value of 5 and cost $350 to $650, plus $100 for installation per window. Insulated Window Blinds have an R-Value of 6 or 13 and start at $150 per window including installation.

Energy Efficient Triple Pane Windows Have Maximum R-Value of 5

Energy Efficient Triple Pane Windows Have Maximum R-Value of 5

2″ Insulated Window Blinds Offer a 690% Improvement

Per the chart below, it is clear that Insulated Window Blinds cost less and have a higher R-Value, but when looking at the performance they will add to a single pane window the research statistics are very impressive.  For someone on a budget, Insulated Window Blinds make protecting windows against heat and cold a very cost-effective option.

R-Value and U-Value Increases for Insulated Window Blinds

R-Value and U-Value Increases for Insulated Window Blinds

Our Insulated Window Blinds are basically the same as the Interior Sliding Shutters in this chart.  Please note that they provide a 692% improvement, are easy to install and are approximately 333% more cost effective than installing triple pane windows.

Here is the R-Value chart from the insulated window foam manufacturer that we will be using. You can see that a 1.0″ thick foam board offers an R-Value of 6.0.  A 2.0″ thick foam board offers an R-Value of 13.1.

R-Value Chart for Insulated Window Blinds

R-Value Chart for Insulated Window Blinds

 

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Simple Payback Formula for Calculating the Cost, Energy Savings and the ROI for Replacing Single Panel Windows

With payback periods ranging from ~30 to 37 years, upgrading windows are unlikely to be an economically viable option for many homeowners

 

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Simple Payback Formula for Insulated Window Blinds

Simple Payback Formula for Insulated Window Blinds

Phoenix, Arizona  – A similar analysis was performed in this study with the goal of determining the payback period for window upgrades in several different climates. Philadelphia, PA was selected to represent a mixed temperature, humid climate. Miami, FL was selected to represent a hot, humid climate. Chicago, IL was selected to represent a cold, humid climate. Phoenix, AZ was selected to represent a hot, dry climate. Lastly, Anchorage, AK, was selected to represent a cold, dry climate.

Payback Analysis by Climate for Single Pane vs Double Pane Windows

Payback Analysis by Climate for Single Pane vs Double Pane Windows

It should also be emphasized here that the installation costs could increase the total upfront cost substantially. Although these results predict slightly shorter payback periods for other research reports, they confirm the same conclusions. With payback periods ranging from ~30 to 37 years, upgrading windows are unlikely to be an economically viable option for many homeowners.

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