Shutters and R-Values: Comparing Energy-Efficient Window Treatments

Dan Taylor

We’re big talkers when it comes to energy-efficient window treatments. That’s because we have proof for our claims. With the help of some scientific research, we’ve been able to directly compare the energy efficiency of the most common window treatments in Atlanta, from blinds to drapes to shutters.

What’s An R-Value And Why What Does It Mean For Window Coverings?

Everything in your home that insulates, from the roof to your windows, has an R-value. That number indicates how good it is at stopping thermal energy from moving through it. A higher r-value corresponds to a better insulator.

honeycomb shades in Atlanta space 

Why does the R-value of a window treatment make any difference? Simply put, a more effective insulator makes it easier to keep your home at a comfortable temperature. No matter if you want to keep the heat inside during the winter or keep your home cool in summer, good insulation is crucial to that effort. That’s extra important for your windows, as they’re one of the most common culprits in heat loss throughout the whole home.

Comparing R-values & Energy Efficiency Of Window Treatments

Not all window treatments are made equal, at least not in insulation. Though there can be some difference due to the material and build between different vendors and makes, this is what you’re likely to find when comparing window treatments.

Type of Window Covering

Average R-Value

No window treatment


Mini blinds






Wood Shutters


Cellular shades


Polywood plantation shutters


R-value averages sourced from HouseLogic &

A quick look at the chart tells you a few things. Perhaps the first thing you notice is the fact that some window coverings barely give you any benefit whatsoever (ahem, blinds), whereas others are insulating powerhouses. That big gap in R-value might result in a difference of several degrees – enough to make an impact in whether or not you turn on the air conditioning.

The second is that what the window treatment is made out of is a big deal. Cellular shades, designed with several engineered layers designed to repel heat, are able to stop energy flow a lot more effectively than pleated shades.

Polywood shutters in Atlanta living room 

Similarly, Polywood® plantation shutters, made from a solid-body faux wood compound, can repel heat a to a much greater degree than natural wood shutters. That’s because natural wood can be porous, with random knots and holes that allow heat to flow through them easily. Polywood shutters, fit with seamless weatherstripping, can create a solid seal on your window when closed, which is the reason for their best in class r-value of 6 and up.

Up Your Home’s R-value

The numbers don’t lie. Your window treatments play a big part in how comfortable your space can be. Think your home could be a bit cozier? We can help. Get in touch with the team at Sunburst Shutters Atlanta by calling 404-962-8517, or fill out our free appointment request form below.