Why Your 28x30x2 Air Filter Looks Black After Just One Month
You just swapped in a fresh 28x30x2 air filter — and barely a month later, it’s already jet black. We get it. At SHIFT HVAC, we’ve pulled thousands of filters out of residential systems, and a blackened filter in under 30 days is one of the most common red flags we see. In our experience, … Read more