The objectives of the Kyoto Protocol and the European Union include the reduction of C02 emissions into the atmosphere; many perhaps do not know that most of the carbon dioxide present in the air arises from domestic consumption, especially from heating systems. For some years now, the obligation of energy certification has been in place for those who sell a property; in this context, great importance is determined by the fixtures, the main ones responsible for heat loss! For more information, read the article "Energy saving with windows"
Certification of fixtures, the glasses
Poorly sealed doors and windows cause cold drafts to enter, resulting in a high consumption of gas and / or electricity for heating and cooling. Another important aspect is the glass; they are considered somewhat the weak point of the windows, since it is precisely through them that heat or cold tends to "pass": in winter they help to lower the internal temperature and in summer to raise it.
It is evident that to aim for energy saving it becomes necessary to install fixtures capable of efficiently reducing the passage of heat or cold; that is why Italian legislation provides for the obligation for window manufacturers to issue a certificate certifying the energy class of doors and windows
Certification of fixtures, thermal transmittance
The parameter that is taken into consideration to draw up the certification is that of thermal transmittance, that is the average value of the heat flow that passes from a warmer to a colder environment in a square meter of frame. This calculation is carried out with specific experiments in the laboratory or, approximately, using a mathematical method.
Certification of fixtures, climatic bands
Current legislation requires compliance with the thermal transmittance limits which, however, change based on the location. In this regard, there are six very specific climatic bands; it goes from zone A where we find the hottest areas of our country up to zone F of the alpine areas. It should be emphasized that the subdivision of the municipalities into the different climatic zones is not given by their geographical position, but by a mathematical calculation that takes into account the average of the temperatures recorded over a year.
The law provides for a difference between newly built homes and those undergoing simple renovation; in this sense we have three different transmittance limits for each area: a lower one for the replacement of doors and windows, an average one in the case of new construction of public buildings and a higher one for new residential construction.
If you decide to redevelop your home from an energy point of view by replacing the old windows with certification that meet the limits of the transmittance values, you can take advantage of the 55% tax deduction. However, in order to take advantage of this deduction, which is carried out over ten years in equal installments, the expenses must be paid by bank transfer. In this regard, I refer you to reading the article "Ecobonus, tax deductions"
Our other related articles that may interest you: "Thermal transmittance: that's what it is“.