When moving into an older home, there are undoubtedly some updates that will need to be completed to make the house more cost-efficient and comfortable. One of those alterations that many people are deciding to make is the switch to floor heating.The former home of Teruo Hara, a famous potter, sculptor and designer, is one example. The Washington Post reported that this country mansion, which is nearly a half-century old, recently had a radiant heating system installed. A local adventure novelist has decided to restore the residence so that it can be a retreat for writers and other artists.The adventure author, Katherine Neville, and neuroscientist Karl H. Pribram, have lived close to the Hara house for 13 years. They bought the place in 2009 and hired the green architect John Spears, president of the Sustainable Design Group, to work on modernizing the home. As the house had been vacant for several years, it needed a lot of work. Spears added insulation, a geothermal heat pump and radiant heat coils beneath the concrete floor on the first level. According to the source, Neville noted that it costs less than $30 a month to run the new heating system in the enormous building.That's not the only mansion that has seen an energy-efficient facelift. According to The Post-Standard, the 26-room Lyon House in Aurora, N.Y., also had not been lived in for four or five years. Paddington Matz and her family purchased the crumbling home and leveraged eco-friendly methods to restore it. Most notably, the Lyon House now uses radiant heating powered by geothermal energy in the floors. Interestingly, the news outlet revealed that the home is warmed by insulation from recycled blue jeans.