EPA’s Eco Tip: Change your HVAC system filter
Check your filter every month, especially during heavy use months (winter and summer). If the filter looks dirty after a month, change it. At a minimum, change the filter every 3 months. A dirty filter will slow down air flow and make the system work harder to keep you warm or cool — wasting energy and contributing to climate change.
Dr. Tony G. Reames 
This is one of the most important things a homeowner can do to ensure their heating and cooling system continues to run properly yet it’s also one of the most overlooked tasks.
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