For heating the building most energy is consumed (about 2 / 3 of the total energy needed to operate the house). It is therefore not surprising that the savings made here can produce the greatest effect. Besides reducing the consumption of energy for lighting, cooking, household appliances or power, although it is possible that the final balance sheet gives a rather small results. In addition, replacement of such equipment is quite expensive, and the economic effect rather problematic.
A good example can be exchanged for ordinary light bulbs cost so much more expensive. energy saving (fluorescent). After calculating the profits of energy compared to incandescent lamps and the cost of purchasing the actual life of most, it appears that the balance of profit and loss account balances itself, and sometimes appear to be more cost-effective conventional bulbs.
Among other things, for these reasons to determine the standard of building energy use index describing only the heat demand for home heating. Is called. Indicator of seasonal heat demand E [kWh / m² a year or kWh / m³ year]. Specifies the amount of heat needed to vaporize 1 sq or 1 m³ house (shall be as required) within 1 year.
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