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Rhode Island 2016

The 2016 FHB House is energy-smart, connected, healthy, and durable. It’s small and sensible. Most of all, it’s a valuable model home, meant to educate designers and builders who aspire to create high-performance houses that are exceptional in their quality, comfort, and style.

Tools & Materials

Tough Choice: Double-Pane vs. Triple-Pane Windows

For ProHOME, the double-pane choice met the net-zero target — and the cost savings paid for a PV solar array.

By Sean Groom Issue 262 - Oct/Nov 2016
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Windows and doors are unique in that they are an important aesthetic component of the house and also a critical part of the building envelope. And, as part of the envelope, they uniquely affect energy consumption through their insulating properties and their ability to add heat to a home through solar heat gain. Let’s tackle the performance issues first.

Energy Performance

Designer Michael Maines started with a combination of picture, casement, and awning windows to maximize energy performance. For operating windows, the hinged action of casement and awning windows closing onto the weatherstripping seals better than double hungs, where the weatherstripping between the upper and lower sashes slides past each other at the check rail. Preventing small amounts of air leaking through the window assembly pays dividends when we get to the mechanical systems and for the comfort of the person sitting near a window.

In a high-performance house, the choice between double-pane and triple-pane windows is fraught. Builders and designers typically have strong opinions on the subject. They fall either into the camp of using the highest-performing windows they can find, or the camp of using high-quality double-pane windows and directing the saved money elsewhere. Maines leans heavily toward the first camp. Mike Guertin, the builder, is firmly in the second camp.

Cost Breakdown

The price differential between double-pane and triple-pane windows for the 2016 FHB House project was roughly $7500. Using BEopt (the National Renewable Energy Laboratory’s free Building Energy Optimization modeling software package), Maines found that the triple-pane windows saved about $32 a year at current electric rates (it’s an all-electric house). Whether you evaluate increased spending on performance from a break-even or return-on-investment standpoint, the numbers aren’t going to work out at any point during the life cycle of the windows.

This FHB House is not a Passive House, so it wasn’t necessary to keep the heating load below a particular threshold. Instead, the goal is to create a pretty good thermal envelope and limit air infiltration to between 1.0 and 1.5 ACH50. The significant savings from foregoing triple-pane windows can be used on a PV solar array. Accordingly, the windows are double-pane Marvin Integrity units, which have a fiberglass frame and will stand up to the coastal weather.

Maines still contends, however, that there is a comfort argument for triple-pane windows that may sway the opinions of some clients, as the surface temperature of the interior glass can be significantly warmer than that in double-pane windows in the winter. A cold window surface chills occupants sitting near it even if the ambient air temperature at the thermostat is in the 70s.

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View Comments

  1. Gerome | Jun 08, 2017 09:52am | #1

    At $32.00 per year savings over double panes in the example it would take almost 235 years to break even.

  2. DMR51 | Oct 25, 2018 03:00am | #2

    I do a lot of Triple paned vinyl replacement windows , I use the Alside / Sheffield heavy duty model and encourage triple pane ... The triple pane added option only costs about $30+/- up charge upgrade per average sized window over double paned LOWe .... Not sure what brand triple paned windows you people used BUT an average house of 30 windows at $30 per window cost to upgrade to triple pane with the scenario I use stated above is only a
    $900+/- dollar increase on the whole house full over double paned ............................I believe the return is way better than $32 for the whole year on electric or gas !! Not sure where they came up with that figure or how they could actually do such a controlled test to come up with that figure ................. The window and structure is already built with double paned glass , the upgrade to triple pane is just adding another pane of glass .. The Alside Sheffield windows I use means the third pane also has the extra UV silver oxide coating on it too making it way better for in that aspect too - and their glass is a little thicker in that window too over average cheap replacement windows . Ive also noticed a big decrease in the noise transfer from the outdoors to indoors using these Alside Sheffield triple pane windows ...... Every customer ive installed therefor have loved the triple pane upgrade and the window I use ...

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