Now it seems there’s a new addition to the list of enemies of the planet: buildings. Perversely, the zealous push for energy efficiency may have had an adverse impact on indoor air quality by forcing buildings to be more airtight. Consider that energy efficiency in buildings is heavily regulated for heating and air conditioning equipment, water heaters, lighting – even illuminated EXIT signs. Before the government started regulating refrigerants, the ones commonly used in building air conditioners cost around a dollar a pound. Congress is terrible at turning energy efficiency policies into a cost-effective reality.

Source: Fox News May 23, 2019 15:46 UTC