Geo Thermal Subdivisions?

The cities of the future can save millions of dollars in their designs. When designing a new subdivision, each subdivision would have a park. Under the park the GEO thermos field would be buried. Each home  would hook up their heating system to the shared GEO field. The homes would only have to worry about heating their homes from 55 degrees to a comfortable temp. This could save the Midwest millions of dollars used each year for heating their homes. There are subdivisions trying this technology in Arizona.