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by xyzzy_plugh
2079 days ago
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> No air is being cycled around the room keeping dust down. I don't get this. Moving air around your home is absolutely wonderful. Even if you have no heating or cooling going on, keeping a constant flow of air helps keep dust down by filtering it, helps even the temperature (maybe part of your home heats up in the afternoon) and most importantly keeps the CO2 levels consistent. If I turn my HVAC fan off, any room I'm in will climb to almost 1000 ppm CO2 in hours. If I leave the fan on, every room stays well below 600 ppm. Flipping the fan switch from "auto" to "on" on my thermostat has been one of the best quality of life improvements ever. |
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I agree with you though that anyone with a central HVAC system should consider leaving the fan in 'On' mode. Also occasionally opening a window and/or running bathroom exhaust fans will allow the hvac system to pull in more outside air. Normally they have a fresh air inlet, but if the house is sealed up well, it will have positive pressure, so little external air will be pulled in. An HEV will do this more efficiently, but if you live in a moderate climate, simply using a window or exhaust fan along with the hvac fan is probably sufficient.