What follows are estimates of reductions in heat loss for a property in the south of the United Kingdom. The calculations are based on London. Expect about 15 percent greater savings in a northern city, for example Edinburgh. The assumption is that the thermostat is set to 21 degrees Celsius and there is the following glazing:
Many properties we are seeing have been converted to have open-plan living areas with abundant amounts of glazing in order to be bathed in natural light.
In our considerable experience, we believe that thermostats can be adjusted downwards slightly because there is less need to compensate for cold spots adjacent to windows. The Carbon Trust estimate an 8 percent reduction in energy consumption for every degree that the thermostat is reduced. See article RADIANT HEAT for information about Mean Radiant Temperature and its affect on comfort.
At 4p per KWh the savings in January alone would be almost £34 assuming an indoor temperature of 21 degrees Celsius is maintained.
Over the expected life of the energy saving window film the savings are conservatively estimated in excess of £5000.
The savings are £12 just for the month of January. Large expanses of older glazing present issues with comfort. See the article INSULATION WINDOW FILM MAGIC FROM 3M.
Over the expected life of the energy saving window film the savings are conservatively estimated in excess of £1730.
The reduction in heat loss is less of an issue. Clients contact WindowTreat about comfort issues where the heating systems struggle to cope with open plan living areas with large amounts of glazing. Do call us if this is your situation.
Please note that WindowTreat accept no liability for the estimates. They have been produced to assist clients' understanding of the energy efficiencies expected.