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Benefit up to 750 euros per year for each apartment that uses the new technology glasses, compared with convertional ones, because of the energy savings achieved. This follows from calculations of scientific institutes and manufacturers of windows are investigating ways to better "climate behavior" of building materials.

According to experts at the University of Lund, who constructed measurement program for energy saving glazing, and calculations of the Centre for Renewable Energy Sources, energy double glazing in Athens reduce annual consumption by up to 7,400 kilowatts for heating and cooling residential area of ​​100 sq. m In Thessaloniki, the corresponding savings exceed 10,000

kWh, Florina zooms to 16,000, while in Chania falls at 5,000.

As noted in the study "Environmental impacts and energy savings for heating buildings in Greek," prepared by Messrs. Droutsas and Balaras by the National Observatory of Athens, "the highest rates observed for saving double glazing." However, "only 4% of buildings have double glazing to all windows and 15% of the flats have double glazing in some apartments. From the recorded buildings, 65% is not thermally insulated and 81% do not have double glazing. " Feature is the fact that the total area of ​​buildings not ordinary double glazing in Greece but simply glazed exceeds 259 million square meters.

"It has been almost established the use of double glazing in new buildings, which also offer better insulation. In existing buildings, whether as part of a renovation is to replace the windows of the building, it is an opportunity to put double glazing. The use of double glazing reduces heat loss compared with ordinary glass by 27% and 40%, and 46% for double glazing with thermal break in, "says Mr. Balaras.

One of the most effective types of glass new technology that prevent much of the heat either entering the building or to leak from the interior to the environment is the selective low-emissivity glass (Low-e), whose values ​​range from 70 euros per square meter without counting the cost of labor for installation.

Also, there are glazed solar control which allow light to penetrate to indirect window or facade while diffuse and reflect much of the solar heat. So the interior stays cooler. In these windows there are layers of special materials that repel solar heat while the windows are double, meaning that they provide very good insulation. Prices for this type of glass ranging from 90 euros per square meter, while the workers are estimated at 20-50 per hour depending on the difficulty of installation (if, for example, must be done using a crane to lift the glass to high floors of building, etc.).

As for ordinary double glazing (or triple), prices start from 40 euro / sq.m. Increased thermal capacity are the panes in their interstices contain another gas, eg, argon instead of air-which are recommended primarily for large glass surfaces in office buildings.

The cost. "For a house that already inhabited and has windows surface 15 sqm with plain glass, the cost of energy glass without labor is estimated at 1,000 to 1,450 euros. Through savings in electricity and oil depreciation occurs within two years, "says the" new "Mr. Chris Lucy, president of the Panhellenic Federation of Merchants and Craftsmen Glass. "But if the installation done in house under construction, there is no charge after you save money on air conditioners and heaters, which need not be as strong due to the high thermal insulation glazing offering new technology," he says.

Huge benefits for Greece

According to research by the Dutch TNO Science Institute, conducted on behalf of the professional association of European manufacturers of glass for the construction industry, the automobile and transportation, Greece could save more than 3.4 billion kilowatt hours of energy annually for cooling the replacement of ordinary glass and glazing solar control in homes and offices in 2020.

Drastically reduced the carbon dioxide released into the atmosphere

New technologies in the construction of mosques and the application of double pane Low-e type in residential work beneficial to the environment, and drastically reduced the amount of carbon dioxide released into the atmosphere.

As the European Manufacturers' the volume of CO 2 emitted per ton of glass produced is declining since the 1970's onwards, due to improved processing techniques and technologies and the highest quality fuel sources. With emissions of architectural glass industry in Europe is estimated to be in the range of 4 to 5 million tonnes of CO 2 per year, the potential economy from the increased use of solar control glazing by far outweigh the construction emissions ". According to measurements, for the manufacture of fifteen square meters of double glazed Low-e released to atmosphere 375 kg of carbon dioxide. With its installation, however, it is estimated that emissions are reduced by at least one household 1,365 pounds of CO 2, due to the energy savings it offers.

As mentioned in the survey of Dutch institute TNO, the annual emission reduction in Europe from the use of such energy glass ranges from 15 to 85 million tons of carbon in 2020. Specifically for Greece, according to the study of Energy Saving Group, National Observatory of Athens, the estimated annual emission reduction from the use of double glazing is 1.6 million

tons of carbon dioxide. While that emits a half months the Ag, the most polluting power plant in Europe.

Air conditioning. Where even the use of air conditioning in Greece reach U.S. levels, which reached levels of 65% for residential properties and 100% for non-residential buildings by 2020, reducing emissions that would result from the solar control glazing will amount to 6.7 million tons of carbon dioxide a year, according to research by TNO. Furthermore, it is estimated that 14.11 billion kilowatt hours saved every year while the total consumption in the country in 2020 is estimated at 79 billion kilowatt hours. At current prices the total kilowatt benefit of saving power for cooling is 1.4 billion annually.