Fresh air and required heat isn't a bad combination. New York City radiator design was very similar after the 1918 flu.
Modern construction with heavy insulation certainly reduces energy use, but at the cost of air quality. Even more modern construction includes air exchangers, but there's a lot of buildings with insufficient airflow.
Modern construction with heavy insulation certainly reduces energy use, but at the cost of air quality. Even more modern construction includes air exchangers, but there's a lot of buildings with insufficient airflow.