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Proof of Window Film Energy Savings

July 16, 2013 | 3 comments

There are lots of options for facilities managers who want to invest in products that will reduce energy bills. But how do you know how much money you’ll truly save? Will the product live up to its claims?

Hyatt Regency Houston wondered the same thing. So the hotel’s local utility decided to put window film to the test to determine how much money and energy would be saved from window film installation alone.

Built in 1972, the AAA Four Diamond hotel is a 924,000-square-foot space with state-of-the-art technology, 360-degree views of the city, and spacious guestrooms. But management noticed frequent temperature complaints from guests staying on the southeast and southwest sides of the hotel. These complaints were interfering with the high-quality hotel experience the Hyatt Regency Houston wanted to provide.

The hotel was looking for energy-efficiency projects that would provide high ROI and address guest comfort, so it partnered with Green Generation Solutions to find cost-effective opportunities. The energy consulting firm suggested high-performance, low-e window film as a high-return investment that would bring utility costs down quickly.

Vista EnerLogic low-e window film was chosen because it improves window insulation and provides all-season performance. Most window films block solar energy, but do very little to keep the heat in during the winter months. EnerLogic does both, keeping heat out during the summer and keeping heat inside during the winter.

As part of this project, an extensive sub-metering system was installed to monitor energy use in 96 guestrooms (48 rooms with window film, and 48 films without window film). To make sure the savings resulted from window film only, no other retrofit projects were performed during this time.

When sub-meter data was evaluated, the rooms with low-e window film showed a reduction of 23% in cooling energy use and a 25% reduction in heating energy. These energy savings provided a return on the hotel’s investment in 3.5 years (using average national installation costs).

This Hyatt Regency Houston study was the first study of its kind to measure exactly how much energy can be saved through window film installation. Never before have energy use and savings been monitored with real-time energy meters on such a large scale with respect to a window film project.

These results confirm that EnerLogic low-e window film is a green solution for effectively saving energy, reducing costs, and improving comfort.

Have you ever conducted a study like this in one of your buildings to confirm energy savings? Why or why not?


  1. TheWindowFilmBlog
    November 17, 2013

    It’s even possible to get a rebate on purchased film as part of energy bills!

  2. Mark Leach
    March 18, 2015

    What exactly is window film? Would window tinting technically be a film? I have heard that it can be a really cost effective and energy efficient investment.

  3. Vista
    March 25, 2015

    Hi Mark – thanks for your question. Window tint and window film are two terms often used to refer to the same thing: window film. Window film is applied to the interior of existing windows, and can offer thermal insulation for your windows. They also offer improved comfort, reduced energy usage and HVAC loads, reduced glare, etc. Please let us know if you have any other questions!

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