Selecting energy windows, what should you think about? Here you will find good tips on insulating glass as well as on energy windows and U-values ​​before choosing your energy windows.

Energy windows - Good u-value windows tips

Energy windows - Good u-value windows tips

According to the Energy Agency, poorly insulated doors and windows release one third of the heat used to heat a house. It goes without saying that good insulation on the windows can greatly reduce heating costs.

Energy-efficient window changes

Common double-glazed windows are often poorly insulated and release large amounts of heat from a house. They emit lots of air in the air slots that were created. A common problem with windows is cold-drawn. This is due to the poor insulation in the window, which causes the inner box to become ice cold. The heat in a room, and from one person, actively looks towards the colder area, making us feel uncomfortable when we get close. This makes it possible for us to warm up a little extra in a house with this kind of window. When the heat loss simultaneously increases through the window, the heating costs will be high.

Insulating glass

One way to solve this is to isolate the space between the glass slabs. This is done through an aluminum frame and before the window is completely sealed, the space between the two glass slabs is filled with a noble gas. The gas has the ability to emit heat, but reduce the energy loss from within the house. In particular, the inner glass pan will also become much warmer, reducing the risk of cold rays. Such a type of window is called an energy-efficient window, or an energy glass. Energy glass can be of two or three-glass model. An insulating glass of good quality can, through its insulating ability, reduce the heating costs of a house with many kronor.

Switching to energy windows?

It is expensive to change windows. If the old ones are bad, it's a good investment to invest in a couple of good energy windows. It gives less cost of heating to a house. According to the Swedish Energy Agency, heating costs can be reduced by up to 30%.

However, if the windows are completely healthy, yet do not have the insulation capability desired, there are other options to choose from. It may be worthwhile to add a box to create a double glazing window or to replace the glass itself with an energy cartridge.

Good with low u value

On each window, an u value must be entered. The lower the u value, the more isolated it is. If the window has an u value of 1.2 or lower, it is rated as an energy window. A good value for a window is a value of 0.9 or lower. They have energy class A. They do not need to be labeled, but many manufacturers have chosen to do it.


Another important value for a window is the transmittance value. It is the value that indicates how good a window emits light and heat from outside. The Energy Agency recommends that at least 52 percent of the incoming solar energy should be emitted through a window to be energy efficient, as well as 63 percent of the daylight.

Other factors also play a role.

In addition to the window's nature, the mounting is, and most importantly, the seal around the window itself. Important factors that affect the energy gain in a house. In many cases, it is worth letting a professional installer mount the window. It is tax-deductible, which means that you as homeowners only pay half the cost of the installation work. Also make sure the window sealing strips are proper and complete. No matter how well the installation is done, it is also inevitable that lists loosen and seals fail. Always take the habit of walking through the windows on a regular basis, and tightening lists if necessary. It pays off in the long run.

Window Guide - Select the Right Window

1. Which windows are best for your house?
2. Are you buying new windows?
3. Window Function - Long-term Investment
4. Which window is best for the environment?

Video: Shopping for Windows? Look for U-Factor|