The Wise Choice for Air Filter Advice
Three weeks into Florida’s heating season, we pulled a filter from a 1987 Carrier system that had been running 90 days on a close-enough replacement, a quarter inch short on two sides. The center of the media was fully loaded. The corners were nearly clean. Unfiltered air had been moving through those frame gaps the … Read more
Last August in Lakeland, we pulled a 17.25×29.25×2 filter out of a 1989 Carrier return grille and it weighed almost three times what it had weighed new. The homeowner had checked Home Depot, Lowe’s, and two Ace Hardware stores looking for a replacement. None of them stocked it. None of them had stocked it in … Read more
Pull a MERV 16 filter from the box and hold it up to the light. The media is dense enough to dim it. Hospital air handlers are built for that kind of resistance. The blower motor in your 1990s Carrier system almost certainly was not. At FilterOwl.com, we’ve tested MERV 8, 11, and 13 filters … Read more
At Filterowl.com, we have seen that homeowners often assume a dirty furnace filter is only an airflow issue when, in reality, it can also be an early warning sign of deeper heating system problems that should never be overlooked. While a clogged filter does not directly create carbon monoxide on its own, it can strain … Read more
Your 21.5×23.25×1 filter is not at Home Depot. Lowe’s does not carry it either. We hear this from homeowners every week, and the frustration is entirely justified. At FilterOwl.com, we tested the 21.5×23.25×1 across MERV 8, 11, and 13 ratings in legacy Carrier, Bryant, and Payne systems. We ran those tests in Florida, in homes … Read more
We installed MERV 13 in a variable speed air handler running a 21.5x26x1 filter slot last season and watched it trigger short cycling within 36 hours. That test result is what this article is built on. Our team measured pressure drop at both high and low fan speeds, compared MERV 13 and MERV 11 across … Read more
On a Code Orange day in Wichita, most homeowners close the windows and go inside. What they don’t check is the filter. At FilterOwl.com, we’ve tested HVAC filters through wildfire smoke events and high-particulate days, and what we’ve measured makes us pay attention to every AQI alert that crosses 100. Wichita sits at a rough … Read more
A 3/16-inch gap between your filter and the housing lets 20 to 30 percent of dust, dander, and mold spores blow right past the filter and into your living room. We measured that ourselves. Check if your current filter fits first before buying a HEPA furnace filter for winter home stuffiness. That gap matters more … Read more
A 3/16-inch gap in your filter housing lets 20 to 30 percent of pollen pass through untouched. That is what we measured in legacy Carrier, Bryant, and Payne systems where the filter did not seat correctly. Buy the highest MERV 13 on the market, and a gap like that still defeats it. Big-box stores stopped … Read more
The American Lung Association ranked Louisville in the top 25 worst US cities for year-round particle pollution last year. For homeowners running Carrier, Bryant, or Payne systems from the 1980s and 1990s, that ranking shows up in the filter slot before it shows up anywhere else. At FilterOwl.com, we track Kentucky’s air quality data because … Read more