The lower the u factor the more energy efficient the window door or skylight.
Energy efficient windows and doors.
In the winter low e glass reflects heat back into the room keeping it warmer.
There are a number of energy efficient features and benefits to consider when researching windows including cost energy savings comfort and environmental sustainability.
Windows doors and skylights must meet u factor and where applicable solar.
And improve the comfort of your home.
January 1 2015 the current criteria were finalized in january 2014.
Windows doors and skylights also known as fenestration are significant components in a home s envelope.
Then review ratings on the energy performance label from the national fenestration rating council nfrc to find the most efficient windows for your needs.
Current specification effective date.
Energy efficiency is an important consideration when shopping for new or replacement windows and doors.
Energy star s u factor is a number indicating how well the product insulates to maintain interior temperatures.
Fiberglass offers energy efficiency and can be painted or stained any color.
Steel front doors are low maintenance and energy efficient options as they resist shrinking swelling and warping.
Ensuring they are as energy efficient as possible can save energy.
Reduce heating cooling and lighting costs.
New performance levels pdf 238 86 kb are effective as of january 1 2016 including northern zone prescriptive and equivalent energy performance criteria for windows doors and skylights in all climate zones.
Iron doors offer unparalleled sophistication and heavy duty security.
Hear builder matt risinger explain how the energy star program can help you maximize comfort and energy efficiency by selecting windows and doors suited to your climate zone.
Solar heat gain coefficient shgc is the fraction of solar radiation admitted through a window door or skylight either transmitted directly and or absorbed and subsequently released as heat inside a home.