Passive Houses

A passive building is a building where the indoor thermal comfort (ISO 7730) is ensured solely by preheating or precooling of the quantity of fresh air required (DIN 1946) for the “correct” inner atmosphere without the use of additional air recirculation. A passive building is a type of construction which offers high energy efficiency, comfort, economy and is environmentally friendly. A Passive Building is a design concept that is open to everyone and is well above the industry efficiency standard.


Regardless of climate or region, Passive Buildings maintain a pleasant temperature with minimal energy requirements throughout the year. The buildings are heated passively, effectively using the sun, internal heat sources and heat recovery, so that conventional heating systems are not necessary even during the coldest winter days. During summer, Passive Buildings use passive cooling techniques, as is the correct shading design and nighttime natural ventilation to keep cool. In any case, the high-quality materials, the technology, and careful planning guarantee that temperatures remain constant throughout the year, in a stable and pleasant for residents / users level.


A Passive Building uses up to 90% less energy for heating and cooling than a conventional building of Central Europe, and requires less than 1.5 litres or 1.5 cubic metres of gas per year, for heating one square meter of living space. Additional economy is achieved in warmer regions, where buildings require cooling. Limiting energy use leads to reduced greenhouse gas emissions, so the Passive Building is a real sustainable option compared with conventional constructions.


Proven by the way a building functions, (which is the only way of determining the actual cost of a building) the operation of Passive Building has reduced cost requirements, while construction costs are amazingly affordable. Investing in high-quality materials, according to the standards of the Passive House, is balanced by the absence of the need for conventional heating and cooling systems. In addition, this investment in energy savings is cheaper and more efficient in the long term compared to the unilateral investment in renewable sources or the easy solution of “fuel switching”.


Passive houses achieve thermal comfort with very low energy requirements. Mechanical ventilation with an energy recovery system, provide the required fresh air, offering high-quality without being perceived by the habitants due to reduced operating noise level. The combination of constant temperatures and proper air exchange prevent damage from moisture and mold growth.

How Does a Passive Home Work?

The strategy of a passive building is to reuse the "free" energy to heat the home. Free energy is defined as heat that is produced from electrical appliances, like, lights, cookers, fridge, computers, televisions etc. The building must be completely airtight and a passive home is very well insulated to ensure this warm air does not leave the house unused.

A mechanical ventilation system with an air to air heat exchanger is installed so that it can simultaneously bring fresh air and remove a corresponding amount of stale air.
– The warm stale air that leaves the house, “carries” the “free” heat, which through the exchanger moves to the fresh air which enters the house.
– The cool external fresh air enters the exchanger, receives the heat of the rejected stale air and enters the house during the winter months, while during the summer the rejected stale air cools the – warmer – incoming fresh air.
– The cost of an expensive conventional heating/cooling system can be avoided and economic benefits can be attributed to better insulation, improved air tightness, window frames,ventilation system and an economic backup heating system.

environmental information

felt shingles roof tiles


The Frames will insulate the construction and be airtight and water tight, improving the thermal insulation as well as the sound insulation.

Kofinas company have chosen the top solutions implementing the most modern construction technology methods.


Chose between double or triple glazed

Top energy efficiency

Top construction materials

Excellent Joining  

Masonry / Walls

Passive walls are completely airtight and are constructed in a very specific way. Standard plasterboard is bonded to 11.5mm stranded board. There is then a further membrane for transpiration that provides protection against moisture. Mineral Wool is the next layer which is sandwiched between a layer of stranded board. There is a layer of polystyrene which attaches to the wooden or brick frame.

environmental information

Thermal insulation

A correctly insulated shell, during the winter, maintains the heat inside the building, while during the summer it prevents the heat to enter the house.

Passive House windows

The correctly designed, insulated and installed frames participate in the best usage of solar gains.

Ventilation heat recovery

The ventilation systems of passive buildings offer clean air, free of pollen and dust, with maximum energy efficiency through heat recovery and humidity control.

Airtightness of the building

Passive buildings are designed to avoid air leaks in the building shell, thus increasing energy efficiency and preventing the occurrence of drafts and damage from moisture.

Absence of thermal bridges

Minimising thermal bridges and weaknesses in the building shell, contributes to creating a pleasant and constant temperature and eliminates damage from moisture while increasing energy efficiency.


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Passive Homes

A passive house is a building where warm "dirty" air, from cooking, body heat etc is extracted and this heat is used to warm outside clean that is circulated into the living area. This is achieved using a heat exchanger and an air tight building. A passive building is a type of construction which offers high energy efficiency, comfort, economy and is environmentally friendly.

Passive Homes

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