One step further. HVAC another large use of electricity. Monitor airflow from room vents. The more fine the filter media may result in lower airflow causing longer HVAC run times. Blower fan motor consume considerably power. No law says to use same rated filter for all seasons.
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Well, I have 40 in my home. Went incandescent to cfl to LED. They have near zero impact on my energy usage.
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Or you could just turn off lights/equipment no-one is using....
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