Furnace Blower Fan on 100% of the time - Good or Bad or it depends? I was at a dinner party last night and two guests described how their HVAC reps told them to run their furnace blowers 100% of the time.  The HVAC reps reasons for the recommendation, as relayed by the dinner guests, were: I've found most blower motor failures are due to unbalanced blower wheels (bearings go bad) or overheating (windings burn up). Both caused by excess dirt in motor/blower wheel. Thanks for giving your furnace/motor experience John. One issue I have with the 100% furnace fan run-time is that it does not provide 'fresh air' but recirculates the indoor air. This practice would certainly require a increase in air filter replacement. And yes seems to me to be an energy waster. Anyone hear the argument that motor start up amps are huge when cycling, so better to leave the motor running and you could 'save energy'? Sounds like a similar argument we've heard about lighting. Any electricians want to chime in on this one?

Thanks for commenting and offering your experience. I'm with you about constantly learning something new. It's never ending in our fields! I also agree with you about poor duct design and installation. It is a root problem for many issues seen. As for running the fan on 'auto' or continuously 'on', from an energy perspective I tend to believe that 'auto' would be more energy efficient over time regardless of whether an individual fan is variable or not (I'm not comparing a variable speed vs a conventional motor here just the fan setting). Wisconsin's Focus on Energy recommends setting fans to 'auto', see link here. They offer commentary on common assumptions about running blower fans continuously. But Focus on Energy's take contradicts what my friends were told by their HVAC reps. Focus on Energy's assumption #3 really speaks to your point that running the fan for temperature stability really masks other issues such as poor duct design, leaky envelope areas, inadequate insulation, etc.

This is just plain wrong. Standard furnace blowers use about 500 Watts and setting them to "ON" for the whole year vs. AUTO wastes about 3,000 kWh/yr. This is a tremendous waste of energy. In addition, in cooling season the fan adds significant heat to the home directly and indirectly if the ducts run outside the conditioned space.split unit air conditioner with two indoor unitsKing Kool- Auto A/C Parts & Repairs# **Limited time special** if you're car's A/C is not blowing cold, the compressor coil could be blown. how to unfreeze a window unit air conditionerCall 674-3653 or WhatsApp 768-3188 NISSAN Tiida Wingroad... air handling unit introductionAD Wagon Note Take advantage of our limited time special for NEW replacement compressor coils INSTALLED at a LOW price!

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