Definitions of a Low Energy HouseAt present a low energy house is practicable without insulation systems. Passive houses are also starting to become more common. Passive houses are also just an interim phase, as it is possible to build houses who net energy consumption is zero, or even houses that produce more energy than they consume.
In comparing definitions of kW readings it is worth noting that such readings are calculatory and describe the heating energy needs in a normal year.
Low energy houseAccording to the commonly used loose definition, a low energy house consumes half the heating energy than a house that fulfils current building regulations.
According to Ministry of Environment guidelines, in planning a low energy house the building’s calculated heat loss must be at maximum 60% of the comparative heat loss in building regulations. By designing a house on this principle and by taking into account free heat loads, overall energy consumption can be halved.
A low energy house consumes less than 60 kw/ brm² a year in South Finland, and under 90 kW/ brm² a year in North Finland.