Skip to main content
Blogreplacement windows

U-Factor Versus Solar Heat Gain Coefficient

By August 23, 2021No Comments

There are lots of things on the ratings labels you will want to know about and look into as you plan for replacement windows in Draper, UT. You might want to research and study up on the various ratings when you are planning for the windows so once you get into the stores, you can read them with ease. But, keep in mind, there are professionals available to help you with any step that you need help with. They can show you what any number means and help you to compare. Here are some of the things you will see on those labels to help you get started with the process.


The U-factor or U-Value is an important number that you will want to understand and know more about as you look at windows for your home. This number will show you how much heat transfers through the windows. You want the number in this area to be nice and low. It will generally range from .2 to 1.20 and the closer you can get to .2, the better it is for your home. The lower number means that not a lot of heat transfers through the window, which is what you want.


SHGC stands for Solar Heat Gain Coefficient. This number will tell you how much of the sun’s radiant heat the window can block. You will also want a number here that is lower. Ratings that are .25 are lower are going to be in your best interest for your home.

replacement windows in Draper, UT

Energy Star Compliant

In addition to the ratings label, your windows may have an Energy Star label on them. This is something many homeowners watch for. They might make it a requirement for themselves to find windows that have Energy Star Certification. If they start with those windows, they can compare the other labels form there. When windows are Energy Star certified, that means that they submitted to the company’s tests—and passed. They meet a certain level of efficiency for your region and they are going to help your home with its efficiency levels. You know you are getting an efficient window. There are going to be some windows with the label that are better than others, so you will still want to compare, but starting with windows that have that label and going from there is often a wise move.

Getting replacement windows in Draper, OR takes some figuring and label reading, but the professionals at HomeStar Windows & Doors are here to help you with that along with all of the other details. When you call us for a free consultation, we can start anywhere you want to start in finding the details you need. We can teach you to read labels or help you to compare some until you get the idea as to which windows are going to be the best for your home and what you need to reach certain goals you have for the project.