Field Studies
Check out our real-world results.
FIELD STUDY 1 | 2017-2018
SOUTH ALBANY AVE, ITHACA, NY
CHALLENGE
The Building:
Circa 1890-1900 building | ~1,576 Square Feet
The Windows:
27 total windows.
- 20 single-pane, double-hung windows with exterior storms.
- 3 single-pane windows with leaded glass.
- 4 windows double-pane windows.
HVAC:
The building is served by a forced-air natural gas furnace.
Thermostat Set Points:
- 69℉ during regular business hours.
- 63℉ during unscheduled business hours. Office staff has access to the building thermostat to adjust temperature set points for two-hour periods.
SOLUTION
Prescriptive Solution:
40 Classic WindowSkin® Prototypes were installed in October 2017.
Results:
13% REDUCTION IN NATURAL GAS USAGE WITH WindowSkins INSTALLED.
Data was collected from October 10, 2017 – March 15, 2018. WindowSkins were mounted for 2,680 heating degree days and then removed on January 7, 2018 for 2,383 heating degree days.
FIELD STUDY 2 | 2019
SOUTH ALBANY AVE, ITHACA, NY
CHALLENGE
The Building:
Circa 1890 building | 5,365 Square Feet
The Windows:
56 total windows, wood-framed and operable
- 43 single-pane, double-hung windows with exterior storms
- 6 single-pane windows with leaded glass
- 7 double-pane windows
HVAC:
The building is heated with hot water baseboard radiators and a natural gas furnace and is cooled by a forced air HVAC system.
Thermostat Set Points
- 69℉ during regular business hours.
- 63℉ during unscheduled business hours. Office staff has access to the building thermostat to adjust the temperature set point. The thermostat resets at the next programmed schedule change.
DID YOU KNOW?
The surface temperature of your windows is a key factor to your comfort in wintertime.
The Center for the Built Environment (UC Berkeley, Berkeley, CA) conducted a study in 2006. They found that in cold weather, people sitting within 5’-6’ of a window felt comfortable when the window surface temperature registered at least 54℉. This was true for conditions where the inside thermostat was set to 72℉ and the heating system was operating properly.
But if the window surface temperature dropped below 54℉, they were uncomfortably cold, EVEN IF the thermostat was set at 72℉ and the heat was operating comfortably.
SOLUTION
Prescriptive Solution:
87 Classic WindowSkin® Prototypes were installed in March 2019 covering 77% of the windows inside the building.
Results:
12% REDUCTION IN NATURAL GAS USAGE WITH WindowSkins INSTALLED.
Base window: Single-pane window with exterior storm window.
Prescriptive: Classic WindowSkin mounted on inside surface of
single-pane window.
Outdoor temperature: 33℉.
Inside temperature setpoint: 69℉.
Average surface temperature of the WindowSkin: 68℉.
Base window: Single pane window with exterior storm window.
Outdoor Temperature: 27℉.
Inside temperature setpoint: 69℉.
Average surface temperature of the windowpane: 62.1℉.
