I think this was more common many years ago, when it was difficult to make a reasonably reliable and efficient heating/cooling system, particularly the small sc

I think this was more common many years ago, when it was difficult to make a reasonably reliable and efficient heating/cooling system, particularly the small scale. Modern HVAC systems can be very efficient, use minimal materials, and require only electricity lines run between homes, for a considerably lower overall infrastructure cost and good efficiency compared to a district system with very extensive plumbing.