Save On Heating Bills With Double Glazing Windows and uPVC Doors by Safestyle UK - Double glazing windows and uPVC doors help in reducing heating bills by almost 50% and result in a cleaner environment by saving households about 750 kgs of CO2 a year. Almost half of the UK's CO2 emissions come from the energy we use every day - at home and when we travel. Reducing this type of energy consumption saves money and environment at the same time. Installing double glazing windows and doors is one of the simplest ways to save upto half of the heating bills. This also makes a nice contribution to the environment.