U Factor And Shgc Standard French Doors

Doors must now have a much lower u value also known as u factor see below and solar heat gain coefficient before they can earn the energy star label.

U factor and shgc standard french doors.

In the southern zone skylights must have a u factor of 0 60 or less and an shgc of 0 28 or less. This radiation can cause your home to heat regardless of outside temperature which. The same shgc cap of 0 50 that applies to vertical fenestration in climate zones 1 to 3 also applies to skylights. The milgard energy calculator provides a quick and easy way to help you select windows and doors that can meet local energy codes and project requirements.

Doors are a little different. U factor is the rate at which a window door or skylight conducts non solar heat flow. To access those tables select the individual product of interest and scroll down to the professional resources section. It s usually expressed in units of btu hr ft2 of.

In the south central zone skylights must have a u factor of 0 53 or less and an shgc of 0 28 or less. Solar heat gain coefficient measures how well a product can resist unwanted direct or indirect solar radiation. For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. This tool provides some of the most common options on windows and doors and related nfrc certified values.

The lower the coefficient the better the glazed door is at blocking the sun s heat. This tool gives you the flexibility to select the required energy star zone u factor shgc or vt and determine which milgard window and door products meet the selected requirements. South facing glazed doors in cold climates should have a high shgc. The u factor of skylights in climate zones 4 to 8 is not to exceed 0 75.

The u factor requirements discussed above for vertical fenestration also apply to exterior glass doors. Solar heat gain coefficient shgc a measure of how well a glazed door assembly absorbs or reflects heat from the sun. Solar heat gain and u factor. In southern climate zones 1 to 3 southern tennessee to the tip of florida there is no u factor cap but the shgc is not to exceed 0 50.

The circled value shows you the rating a door has received. Each rating is split into two values. U factor shgc solar heat gain coefficient product type any awning casement double hung fixed casement french door horizontal slider picture window side lite transom single hung sliding glass door storefront door storefront window. Energy performance data for select combinations of options is available in table format on each product page.