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Farmstead - renovation with focus on energy optimization

In 2008, Karl Erik Slynge took over a 105 year old farmstead in the town of Jerup. Instead of tearing the old buildings down and build a new one, he decided to energy renovate the 240 m2 property, which consist of a 150 m2 farmhouse and a 90 m2 outhouse.
Karl Erik Slynge wanted to contain the soul of the old buildings and meanwhile energy optimize the property by scrapping the old oil furnace and raise his own household windmill.

The renovation work is composed in a way that the house produces more green energy than it consumes. This means, that the house is expected to be self-sufficient with sustainable energy and thereby making the owner independent of the increasing energy prices in the near future.

A comprehensive building project

It was a massive renovation project of the two buildings. The farmhouse was externally insulated and 350 mm of further insulation was implemented on the ceiling.The floors were also insulated with 350 mm insulation and equipped with floor heating systems. Furthermore, all of the windows of the house were replaced with new super low energy windows. The farmhouse can meet the requirements for low energy buildings according to the Construction Legislation of 2015. The outhouse was also insulated externally and the ceiling got a total of 300 mm of insulation. Also waterborne radiators were established for house heating. After the renovation, the outhouse lives up to the demands in the BR-2008.

From big consumption to sustainable energy

Before the renovation, an old oil furnace provided the heat and hot water in the farmhouse. The outhouse was heated by electric heating panels and the hot water came from an electric boiler. In total, the property used approximately 3,000 liters of fuel oil and 5,900 kWh of electricity. The changes were significant after the renovation, where the old oil furnace was scrapped. Instead of the oil furnace, geothermal heat was installed and connected to a 10 kW heat pump. Heat supply of both buildings, including the production of hot water, now counts of 10.000 kWh of electricity per year. There has been installed a 6 kW household windmill which has an estimated production of electricity at 15.000 kWh per year.

In 2011, the total consumption of electricity was at 16.000 kWh, which means that they bought 1.000 kWh of electricity from the grid. Therefore, the owner decided to change all of the lighting sources in the property and replace them with LED lights and thereby saving of around 2.000 kWh of electricity per year.

Financial gain

The owner reports that the total expenses of the energy renovation in the property, have a calculated return on investment of 11 years. In addition to this, it is worth mentioning that the energy renovation has increased the value of the house by 80 %.