Energy Efficient Low-E Glass - ENERGY STAR Qualified | Zabitat

Energy Star

Make Your Home More Energy Efficient

A green home doesn’t have to compromise beauty or natural light. ODL and Western Reflections door glass can be used in exterior doors to meet ENERGY STAR® and NAHB National Green Building Standard specifications.

Select ODL or Western Reflections door glass products meet regional ENERGY STAR thermal performance standards as defined by the U.S. Department of Energy (DOE) and Natural Resources-Canada (NR-Can). Find out more about energy efficiency specifications in your area. Local and state codes are developed using ENERGY STAR guidelines but may be more or less stringent.

Energy Efficiency Properties of Door Glass

Thermal performance of door glass is measured by two properties: resistance to heat flow and resistance to sunlight warmth.

  • Heat flow is expressed by the U-factor value; less heat flow yields a lower U-factor value.
  • Resistance to sunlight warmth is measured by the Solar Heat Gain Coefficient (SHGC); less sunlight warmth through the window yields a lower SHGC.

ODL Doorglass Ratings

Energy efficiency ratings for ODL and Western Reflections door glass products vary by door construction, size of doorglass, and the materials of the doorglass assembly.

The ratings of participating entry door manufacturers can be found in the Thermal Performance DatabaseContact ODL for more information about which entry door and doorglass combinations meet ENERGY STAR requirements.

U.S. ENERGY STAR Criteria for Doors (Effective January 1, 2015)

The U.S. standards include criteria for air leakage. Swinging doors cannot exceed 0.5 cfm/ft2.

Glazing Level U-Factor SHGC
Opaque < or = 0.17 No criteria
< or = 1/2 Doorlight < or = 0.25 < or = 0.25
> or = 1/2 Doorlight < or = 0.30 < or = 0.40 for Northern and North-Central Zones
< or = 0.25 for Southern and South-Central Zones

US-estar-map

Note: See the complete list of U.S. ENERGY STAR climate zones by state and county or zip code.

Canadian ENERGY STAR U-Factor Criteria for Swinging Doors, Sidelights & Door Transoms

Canadian standards are the same for opaque and glazed doors.

Canadian standards include a criteria for air leakage: leakage cannot exceed 1.5 L/s/m2, or 0.3 cfm/ft2.

Maximum U-Factor
Metric Units Imperial Units
Zone 3 1.20 0.21
Zone 2 1.40 0.25
Zone 1 1.60 0.28

 

The 2015 Canadian climate zones are determined by heating degree day (HDD) values as found in the Model National Building Code (2010).

Zone 3: > or = 6000 HDDs
Zone 2: 3500 to < 6000 HDDs
Zone 1: < 3500 HDDs

US-estar-map

A full description of the 2015 ENERGY STAR technical specifications for residential windows and doors sold in Canada is available through Natural Resources Canada.