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Justification

Example of life-cycle costs. Cumulative difference between a passive house apartment building and typical apartment building. Payback time for extra investments is between 5 – 7 years.
Basic solutions for a passive house. The solutions depend on the climate. Special attention should be paid on summer comfort and proper heat distribution in winter.

Benefits
It is clear that improving energy-efficiency of a building requires more effort and investment in design of the building, and also in construction of the building envelope. If the energy-efficiency is improved by simple, low-cost, and small-sized measures, it brings along important consequences. Power demand for heating and electrical energy, service power demand, basic rates, heat exchangers and heating equipment can be reduced thus providing cost-savings compared to typical buildings. In a Passive House, the cost savings from the building services systems may cover a high share of extra costs on building envelope.

The extra investment in Passive House technology depends much on current level of construction, thermal insulation, and ventilation and window technology. Also experience on low-energy and Passive House technologies affect on effort required. As Passive House providers gain experience, and the market increases the extra costs tend to decrease. On the life cycle perspective a Passive House is an economic investment independent on present construction technology.

Strategy
The strategy of energy efficiency of a passive house bases on minimized heat losses of the building envelope and ventilation and efficient utilisation passive solar input for heating. This is a rather clear approach for a cost-efficient and energy efficient housing.

For a housing provider a passive house serves for improved return and reduced running costs. Low energy consumption and power demand reduce energy and connection costs. Simple building service's systems reduce maintenance costs. Low heating power demand requires only minimum heating systems, which also reduces the investment to systems. If the construction process is properly managed, the total construction costs are equal to typical construction.

Extra costs of energy efficiency are difficult to be explicitly shown. The major reduction in the investment costs comes from the management of the whole process. When professionally managed, a building process can bring cost-savings that together with reduced systems cover the costs of super-insulation, high performance windows, improved air tightness etc. totally.

Thermal comfort, draught free climate, and good air quality due to proper ventilation rate are easy to maintain in a passive house. Thus a low energy demand is a key to a good indoor climate.