While necessity may be the mother of invention, it’s increasing costs that spawn efficiency. Before the ’70s, we happily cranked up the thermostat when the house felt chilly. Once
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The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) sets the standard for residential ventilation at a minimum of .35 air changes per hour, and not less than 15 cubic feet per minute (cfm) per person. An old home may very well exceed these values—especially on a windy day. However, on a calm winter day, even a drafty house may fall below the recommended minimum ventilation standard.
There are partial solutions to the indoor air-quality problem. For example, an electrostatic filter installed in a forced-air heating system will reduce airborne contaminants, but it won’t help with moisture, stale air or gaseous pollutants. And, local
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