Clear Advice for Cleaner Air
Kerrie Dean 
You measured the room, ran the math, and landed on 24,000 BTU. That part is settled. What almost nobody tells you is that going ductless changes how your house filters its own air. We are a filtration site, so we have no opinion worth having about compressor warranties. But the mini split questions that reach … Read more
Is it safe to breathe the air in Columbus, Ohio right now? Check the live map above for today’s exact reading, then keep reading. We track this same question across dozens of FilterClarity’s city AQI guides, and Columbus’s pattern, mild for most of the year until ozone or smoke tips it over, is one we’ve … Read more
Your furnace runs almost nonstop once the temperature drops, and every bit of air it moves has to pass through one small part first: your filter. A clogged winter HVAC filter does not just make your system work harder. It can raise your energy cost every month until you swap it out. We have seen … Read more
Check the map above before you do anything else. That number is today’s Air Quality Index (AQI) for Washington DC, pulled from EPA monitors around the city, and it moves by the hour and by the neighborhood. Green means open the windows. Orange or higher means the air near your kitchen and your kids’ bedrooms … Read more
A standard furnace filter doesn’t kill germs. It traps the particles that those germs ride on, and only if the rating is high enough. The MERV (Minimum Efficiency Reporting Value) number printed on the side of your filter is what decides whether that trapping actually happens. We’ve answered this question for thousands of homeowners, and … Read more
Run a finger across a shelf two weeks after installing a fresh 24x25x5 MERV 8 filter in a Day and Night cabinet, and you’ll feel the difference. Run it in the same spot six months later with the same filter still seated, and the dust is back — along with a blower working harder than … Read more
The most common furnace filter mistake we see isn’t choosing the wrong MERV rating. It’s the right filter, running six weeks past its replacement window, in a home where someone’s stopped wondering why the dust keeps coming back. Finding furnace filters near you is genuinely straightforward once you know your size. The harder question — … Read more
The most common furnace filter mistake isn’t skipping a replacement — it’s installing the new one backward. We see it across the homes we evaluate: a well-chosen filter seated in the wrong direction, working at a fraction of its rated efficiency while the system runs just fine. The homeowner has no idea. A correct installation … Read more
At FilterClarity.com, we have seen that homeowners often assume one night without a furnace filter is harmless, but even a short stretch can allow dust, lint, and airborne debris to move directly into the system instead of being captured where they should be. In our experience reviewing common airflow and filter-related problems, the bigger issue … Read more
In a pre-2010 HVAC system with a fixed-speed blower motor, a 22x22x1 MERV 13 filter can behave like one that’s already half-clogged—from the moment you install it. The system runs longer to reach temperature, the energy bill climbs, and the air quality improvement—while real—costs more to deliver than most homeowners expect. Here’s what most filter … Read more