Ask Adam: When Only the Furnace Fan Is Running, Is It Similar to an Air Exchange?

In previous Ask Adam’s, a furnace fan’s function was defined as well as an air exchange is. Now the question is, will running a furnace fan result in the same results as running an air exchange?

Your furnace may not have a fresh air intake at all. However, some systems do have provisions for fresh air intake, either a fresh air duct and cycle timer, or some sort of ERV. Also possibly a whole-house dehumidifier with a fresh air intake.aeroseal duct sealing - humidifier for furnace crystal lake il

Fresh air intakes are required by law in some places but older houses sometimes don’t have them. An HRV or ERV is best for ventilation. If you want “free” cooling then the recommendation is to use an air exchange. If you don’t have an air exchange, we have Honeywell air exchangers such as the one seen below.

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Are you wanting to improve Indoor Air Quality? Email me directly at You also always reach us 24-hours, seven days a week by phone 815-220-5125 and you can also request an appointment.