An underground carbon neutral home has received various offers after the family living in it decided to move out.
The house in the Hockerton Housing Project invited high levels of interest related to its low energy bills.
Built by Nick White and Trudi Macagnino on the site near Nottingham, the house is under six metres of earth and has a 19-metre conservatory.
These features mean it takes advantage of the ground's natural heat and insulation as well as the sun's warming power, meaning heating costs are minimal.
Mr White said: "Since moving in 1998, our earth-sheltered home has used less than £10 on space heating, while never going below 18 degrees C. Overall we only use ten per cent of the energy we used in our previous cottage, and most of that we meet with wind and solar power?.a huge testimony to the insight of designers."
A recent survey by the Energy Saving Trust revealed that homebuyers were willing to pay more for homes that were more energy efficient and would cost less to run.
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