Quick Answer: What Is A Good U-Factor For A Window?

What is a good Shgc for Windows?

To be Energy Star rated, windows must have a good SHGC rating of 0.25 or less..

Is a higher U-value better?

The lower the U-value of an element of a building’s fabric, the more slowly heat is able to transmit through it, and so the better it performs as an insulator. Very broadly, the better (i.e. lower) the U-value of a building’s fabric, the less energy is required to maintain comfortable conditions inside the building.

What is the U value of single pane glass?

1.1Remember, single pane glass usually has a U-value of 1.1, which means that the saturation of the heat and or cold can be nearly 90%. By increasing that value or making the window itself more insulated, you can improve your energy usage significantly. Single pane glass can be energy efficient if they are a storm window.

What is the U value of double glazed windows?

1.1 W/m²KThe current industry standard double glazed unit is made up of one 4mm pane of “Low E” (Low Emissivity) coated glass*, one pane of 4mm plain annealed glass and a 20mm cavity of argon gas (make up = 4-20-4). This will provide a centre pane u-value of 1.1 W/m²K.

Is lower U value better?

U-values measure how effective a material is an insulator. The lower the U-value is, the better the material is as a heat insulator. … Very broadly, the better (i.e. lower) the U-value of a buildings fabric, the less energy is required to maintain comfortable conditions inside the building.

What is the U value of Low E glass?

GLASS PERFORMANCE CHARTCodeU-ValueClearDual0.480ClearTri0.310LOW-EHS1-C1800.260LOW-EHS2-C1800.1846 more rows

What is the minimum U-value for a window?

1.6 W/m2KTo comply with building regulations, windows (like every other element of your property) must meet a certain minimum U-value. In the case of a window, it’s 1.6 W/m2K. Double-glazed windows, filled with argon, are typically 1.4 W/m2K, while thicker triple-glazed windows can go as low as 0.7 W/m2K.

What is a window U value?

The U-Factor measures how well the window in- sulates. While the U-Factor can take any value, in general for windows it ranges from 0.20 to 1.20. The lower the U-Factor, the better the window insulates. The SHGC measures how much of the sun’s heat comes through the window. It can range in value from 0 to 1.

How do I find the U value of a window?

Calculation of U-value of windows. Heat loss = U x A x dT where U = U-value (W/m2K)Thermal transmittance A = Area of surface (m2) dT = Temperature difference inside to outside ( K ) Units of heat loss = Watts. – does include for thermal bridging in the main fabric elements of floors, walls and roofs.

What kind of windows are most energy efficient?

Energy-Efficient Glass Dual-pane glass insulates almost twice as well as single-pane, while triple-pane glass maximizes your energy efficiency. Inert argon gas can be used between panes of glass to improve insulating properties and help reduce thermal transfer.

What is a good U-value?

The best insulating materials have a U-value of close to zero – the lower the better. Building regulations currently stipulate that for a new building, the elements must have maximum U-values as follows: Wall – 0.3 W/m2k. Roof – 0.15 W/m2k.