The Inside Scoop at CellularWindowShades.com

Overheating Help, from CellularWindowShades

Posted on: July 6, 2012


The Green Building Forum, in the UK, featured this recent Q&A session about blinds. One forum-poster, JT, confessed “I think I’ve been so fixated on heat loss that I hadn’t given thought to avoiding overheating.”

With July temperatures already wilting many communities, OVERheating — through glass found in windows, patio doors, and skylights — is a concern.

Of exceptional interest is James’s link to this article on Thermal Performance of Traditional Windows. I have “original” windows in my modest Cape-style home here in Vermont, and have blogged a couple of times about the value and also the historic desirability of original sash windows (never mind the landfill conundrum). This article actually uses the phrase “evidence is available to counteract some of the misconceptions about the energy efficiency of original timber sash windows“. They advocate simple repairs and “basic improvements”.

In point number 3, where there is discussion of curtains and “roller blinds”, imagine how much more effective and efficient those windows could be with Cellular window shades. We’ve got data to back up our assertions: Check out our R-values for Cellular Shades page.

If the UK strives to target U-value for windows of 2 or below then more windows should be covered by Cellular Shades: “To compare R-value and U-factor, divide 1 by the U-factor number,” says the site Efficient Windows.org. Using this to get an R-value for “high performance double-pane windows” -> with a U-factor of 0.30 on average – that equates an R-value of 3.33.

This R-value is desirable: and what comes close is the Light Filtering Cellular Window shade fabric, with an R-value of 2.8.

Add side tracks to that same shade and you’ve raised the R-value to 3.3 — and tied that “high performance double-pane” window.

Use Black Out fabric rather than Light Filtering fabric and you up those values even more: R-value of 4.0 and, if you add side tracks, 4.7.

These numbers are for SHADE ALONE. Once you factor in the window itself, you’re potentially reaching R-values in the range of 8.2.

So how does all this help with keeping OUT the hot weather, as well as keeping in HEAT during the winter months?

English Heritage has produced a video Sash Windows – Why They Are Worth Keeping. The same link also gives access to a couple of well-thought-out publications on improving thermal performance.

It’s a two-way street: What improves to keep heating inside rather than dissipating to the outdoors also helps keep the sweltering outdoor temperatures from impacting your internal temperature. If outdoor heat doesn’t enter your premises, then your cooling system — whether a/c units or fans — can relax and work much less.

CellularWindowShades.com offers the following “Handy Info” pages:

* * *

“There is nothing quite like walking into a cool room on a hot day…”

If you answer the following question, with a YES, maybe it’s time
to research Cellular Shades and Skylights:

Do you start your air conditioning early in the morning,
and run it all day??

(for A Cooler You, Click on the link or photo)

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2 Responses to "Overheating Help, from CellularWindowShades"

I left all of my honeycomb shades down while I was at work on Friday- outside temp was about 90 degrees and when I got home the inside temp was 78 degrees without running the AC.

Dear Sonia,

Thanks so much for writing! Not only is it GREAT to hear from customers, but consumer “evidence” goes a long way to illustrate how well cellular shades work, in all weathers (hot and cold). Every little bit helps, when it’s that warm out, huh?

Stay cool, and thanks for stopping by.

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