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HVAC Problems: A Dirty Blower Wheel

Any dirt on these blades will cause your blower motor to work harder. This draws more amperage and pushes less air. When as little as 1/10th of an inch of dust accumulates on your blower wheel, it can reduce your furnaces efficiency by 20%. Another problem that arises from this dust accumulation is your heat exchanger running hotter. This will ultimately lower the lifespan of your furnace.

Even a fine layer of dust on the condenser coil reduces its efficiency. An EPA study showed that as little as 0.042″ of dirt on condensing coils will cause a 21% drop in efficiency, and can increase refrigeration energy use by 35%. That’s a shocking amount of inefficiency and cost from a relatively minor amount of dirt accumulation.

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