Hyatt puts window film to the test.

Situation

As a AAA Four Diamond hotel built in 1972, the 924,000 square foot Hyatt Regency Houston has a reputation to uphold. It offers state-of-the-art technology, 360-degree views of the city from an award-winning revolving restaurant, and spacious guestrooms. But temperature complaints from guests on the southeast and southwest sides of the building due to the solar heat were diminishing an otherwise high-quality experience. With energy expenditures totaling $1.6 million annually, directing money toward high utility bills also was preventing the hotel from offering best-in-class service and amenities.

Solution

The 32-floor hotel partnered with Green Generation Solutions (GGS) to find a way of driving down operating costs and reducing temperature inconsistencies across its 950 guestrooms. GGS suggested high-performance window film as an energy-efficient investment that would bring utility costs down immediately and solve guest discomfort. After analyzing dozens of window films, GGS found Vista™ by LLumar® EnerLogic® 35 outperformed all competitors in total energy savings and insulation performance. Window film was the clear choice in reducing costs and energy use, but staff members at CenterPoint Energy (the local utility) wanted to measure the difference film would make.

During installation, an extensive sub-metering system was installed to monitor energy use in 96 rooms (48 rooms with and 48 without window film). Sub-meters were placed on specific pieces of HVAC equipment to directly measure energy savings from the window film. No other HVAC retrofit projects were performed during this time. This study was the first of its kind to directly measure the energy saved through window film installation alone. Never before have real-time energy meters been used to monitor energy use and savings on such a large scale. Before the project began, GGS completed an energy simulation model with an estimated 20% reduction in room HVAC heating and cooling costs.

Result

When savings were calculated by comparing sub-meter data, the rooms with window film showed a reduction of 23% in cooling energy use and 25% in heating energy. Using national average installation costs, these energy savings provided a payback on the hotel’s investment in 3 ½ years, or an ROI of 28%. The results seen at the Hyatt Regency Houston prove that EnerLogic® window film installation is a green solution that can effectively save energy, reduce costs, and improve occupant comfort.