U-values explained. What are U-values and why are they important?

U-values measure how effective a material is as an insulator. The lower the U-value, the less heat is lost and the more insulation the material provides.

Many Irish homes have inefficient glass that allows valuable heat to escape at a faster rate than other materials. U-values help indicate the massive difference in heat-retention between our Low-E-Plus2™ heat-retaining glass and poor materials, like single glazing or old double glazing (see the table below).