Table of Contents
What is a good U-factor and SHGC?
The “30/30” rule is common: U-factors of under 0.30 (which is good) are often paired with SHGC’s of under 0.30.
What is a good SHGC factor for windows?
To be Energy Star rated, windows must have a good SHGC rating of 0.25 or less.
Is a low SHGC good?
The lower the SHGC, the better it will achieve this. Glass with a low SHGC is best used in areas of direct sunlight, for example to reduce the amount of heat coming through the windows in summer.
What is a good U-value for glass?
1.6 W/m2K
Building Regulations U Values for Glass When renovating or extending a home the glazing elements must have a Uw value of 1.6 W/m2K or better. For a new build house you have to look at the energy requirements of the building as a whole but the glazing cannot have a Uw value of worse than 2.00 W/m2K.
Is a higher SHGC better or worse?
The lower the SHGC, the less solar heat it transmits and the greater its shading ability. A product with a high SHGC rating is more effective at collecting solar heat during the winter. A product with a low SHGC rating is more effective at reducing cooling loads during the summer by blocking heat gain from the sun.
What is a good U-Value?
In 2018, Part L building regulations for standard replacement doors and windows specified that a product should have a U-Value no higher than 1.6 for windows, and 1.8 for doors.
What is a good U value?
Is higher or lower SHGC better?
Is higher SHGC value better?
What is a good U factor rating?
Determining the U-Factor For most energy-efficient windows, the U-factor for the entire window assembly is higher than the U-factor at the center of the glass. The best, high-performance, double-pane windows may have a U-factor of 0.30 or lower, indicating that they are very energy-efficient.
What is a good SHGC rating?
When it comes to an optimal SHGC rating, again you will want to look for a rating of 0.25 or less for efficient energy performance and lower A/C costs. Although for people that like their home on the warmer side should choose a SHGC rating between 0.35-0.60 to allow natural solar heat in.
Is higher or lower U-value better?
U-values can tell you how well an insulated glass unit (IGU) will hold in heated or cooled air. The lower the number, the better the insulating performance.
What is a window U-Value?
The typical U-Values on windows is a measurement of heat loss and the rate at which it is lost. U-Values indicate the overall performance in retaining heat and preventing it from escaping to the outside. U-Values are measure in Watts per square metre Kelvin, or W/m2 K.
Is a .27 U factor good?
The best, high-performance, double-pane windows may have a U-factor of 0.30 or lower, indicating that they are very energy-efficient. Some triple-pane windows may have a U-factor as low as 0.15.
What are good you factor for Windows?
Consider the placement of the skylights in relation to the movement of the sun’s natural light
In this situation, an SHGC value of 0.42 to 0.63 is desirable, and higher is better. (In hot climates, look for values as low as 0.25.) Unfortunately, due to the different low-e coatings used, higher SHGC values generally also come with somewhat higher U-factors. In other words, to get more solar heat gain you have to give up some insulation value.
What is SHGC and why is it important?
Glass –. Protective glass coating can greatly reduce the amount of solar heat that enters a home.
How to calculate SHGC?
U Factor of 0.28 and SHGC of greater than or equal to 0.32