Reporting What Matters Most: The Air You Breathe.
Your furnace filter only works while the furnace runs. EPA puts typical residential runtime under 25 percent of heating season, so the filter you chose carefully sits idle most of the winter. We met pet owners who upgraded the rating, changed it on schedule, and still could not work out why February smelled like dog. … Read more
TheFilterReport is editorially independent. We sell no products and accept no affiliate arrangements. Here is how we work. We do not sell mini splits or install them. We test what moves through filters, so we meet these systems at year three, when someone gets in touch because a room feels stale. The complaints rarely trace … Read more
ENERGY STAR certification for a ductless mini split requires 15.2 SEER2. We went looking for that number in the primary source because the figure we kept seeing quoted across 2026 buying guides, 18.7 SEER2, did not match anything in the current criteria. It traces back to a proposed recognition document from 2022, for a separate … Read more
On a hot Nashville afternoon, the sky can look clear while the ozone reading quietly climbs past 100. That gap, between how the air looks and what it is doing, is the whole problem. The American Lung Association handed the Nashville-Davidson-Murfreesboro metro a failing F for ozone smog in its 2026 State of the Air … Read more
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
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
Four months. That’s how long the 24x25x5 MERV 13 lasted in a Day and Night air handler we pulled in an Orlando attic last July. The media was gray across the full face. Upstairs supply registers were running weak, the blower was working audibly harder at setpoint, and the system was taking longer cycles to … Read more
Last February, during week three of the flu wave, we pulled a fiberglass filter out of a 1,900-square-foot home in Phoenix. The face was matted with hair and gray lint, and from the outside the filter looked like it had been doing its job. Then we took particle counts at the supply registers in the … Read more
Ninety seconds. That is the typical time it takes to swap a furnace filter. And those 90 seconds are where our team has documented more preventable HVAC damage than at any other point in the residential maintenance cycle. In more than 200 home systems we have evaluated over three years of field work, the culprit … Read more
We measured airborne dander concentrations in a two-dog household the morning after a grooming session and tracked the readings for 72 hours. Without a properly rated filter running, levels stayed elevated well past that window. That result is not unusual. Pet dander in home environments behaves nothing like ordinary household dust, and that distinction is … Read more