Old house saves 3,000 euro per year in energy bills

An old house from 1927 was renovated in 2004/2005 in order to minimise its energy bills. The results show savings of up to 57% corresponding to 3,000 euro less per year in energy bills and a better indoor climate - a much more beneficial result than expected.
 

Energy consumption
The house had an energy consumption of 53,400 kWh per year at an indoor temperature of 20°C before the energy renovation. After the renovation, it has been possible to reduce the energy consumption to 22,600 kWh per year and still keep the same temperature. This equals a reduction of 3,050 litres of fuel oil per year - this is 550 litres more than first estimated.

Building year
1927
 

Renovation year
2004/2005

Size
161 m2

1900 euro saved annually
The improvements in the house were carried out to a price of 21,000 euro. After the financing, net savings equals 1,900 euro per year.

What was done?

• Cavity walls, loft, sloping walls and the space under the eaves were re-insulated with Rockwool insulation. 
• Windows were improved with energy glass.
• Heating system was provided with temperature control.
   

Better indoor climate
Not only did these improvements mean lower energy bills. They also resulted in a higher comfort level and a better indoor climate for the family living in the house. After the energy renovation the family started having higher temperatures in the villa, thus converting part of the potential saving into increased comfort/ higher temperature.

The resulting energy savings in litres of oil without correction to 20 °C is: 2770 litres.Thus, the part of the energy savings chosen by the family to be converted into higher temperature levels, i.e. increased comfort, is 280 litres of oil – a common phenomenon after energy renovations.