merv 13 vs merv 11

The Ultimate HVAC Air Filter Maintenance and Replacement Checklist: A Homeowner’s Step-by-Step Guide to Cleaner Indoor Air, Lower Energy Bills, and a Longer-Lasting System

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An image of an HVAC technician replacing a dirty home air filter, Master HVAC upkeep with our complete air filter checklist.

Pull any HVAC filter at the manufacturer’s recommended 90-day mark, and the verdict varies wildly. In our testing, some are still fine, most are already costing real money on the energy bill through restricted airflow, and a small share of humid-climate filters have started loading mold by then. The conditions inside your home decide the … Read more

MERV 13 Filter How Often To Replace: Signs MERV 13 Filter Needs Changing, What Happens If You Don’t Change MERV 13 Filter, And How Often Should I Change My MERV 13 Filter For Virus Protection

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An image of an HVAC technician replacing a MERV 13 furnace filter.

A MERV 13 doesn’t fail on a calendar. It fails when its pleats fill, and what fills them depends on what’s moving through your air. We’ve pulled identical filters that ran ten quiet weeks in a low-traffic two-person home, then quit in nineteen days in a household with two indoor dogs after a wildfire week.  … Read more