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R-Values of Shutters: Compare Energy Efficiency of Window Treatments

June 13, 2017

We’re big talkers when it comes to energy efficiency in window treatments. That’s because we’ve got proof for our claims. With the help of some objective research, we’ve been able to map out the energy efficiency of the most common window treatments in Charlotte, from drapes to blinds to shutters.

What’s An R-Value And Why Is It Important For Window Treatments?

Everything in your home that insulates, from the roof to your windows, has an R-value. That value indicates how effective it is at preventing thermal energy from moving through it. A larger r-value means a more effective insulator.

honeycomb shades in Charlotte house 

So what difference can the r-value of a window covering make? Well, a more energy efficient window treatment makes it easier to keep your space at your preferred temperature. No matter if you want to keep in the heat during the winter or want to stay cool in summer, great insulation is a requirement. That’s extra necessary for your windows, because they’re a likely culprit for energy loss in your home.

Window Treatment R-value Comparison Chart

Not every window treatment offers the same benefits, at least not when it comes to energy efficiency. Though there can be some variation based on the material and construction between different companies and models, below is what you can expect to find when comparing window treatments.

Type of Window Covering

Typical R-Value

Window alone








Hardwood Shutters


Cellular shades


Polywood plantation shutters


R-values from HouseLogic &

A quick glance at the table tells you a few things. Perhaps the first thing you notice is the fact that some window treatments offer almost no benefit whatsoever (we’re talking about you, blinds), while others are energy-efficient beasts. That big gap in R-value might mean a difference of several degrees – enough to make an impact in whether or not you turn on the AC.

You might also notice the fact that what the window treatment is made out of makes a big difference. Cellular shades, which are made with several engineered layers designed to repel heat, are able to put a stop to heat flow a lot more effectively than pleated shades.

plantation shutters in Charlotte living room 

Similarly, Polywood® plantation shutters, made from a completely solid faux wood polymer, are able to block heat a to a much greater degree than natural wood shutters. That’s because natural wood can be porous, with random holes and gaps that allow heat to move easily. Polywood shutters, outfitted with seamless weatherstripping, can create a solid seal on your window when shut, giving them that best in class r-value of 6 or more.

Up Your Home’s R-value

The stats don’t lie. Your window coverings play a big role in how comfortable your space is. Could your home be a bit more comfortable? We can help. Talk to the team at Sunburst Shutters Charlotte by calling 980-231-1116, or fill out our free appointment request form below.