Trinity Glazing supply and fit Slimtech Heritage Double Glazed Units, which provide the best window insulation and increase the solar factor in domestic or commercial properties. For low U-Value windows, Slimtech Heritage Double Glazed Units are what you need, and Trinity Glazing is who to call. Insulation is measured in U-Values. A lower U-Value number means better insulation. U-Values measure how well heat transfers into or out of a building. To determine how well heat transfers in or out of a building, the U-Value calculation looks at the entire window, including frame, sash, and glass. Trinity Glazing, based in Edinburgh, install Slimtech Heritage Double Glazed Units with low U-Value numbers, that keep the heat in and the cold out.