We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Tim Heffernan Tim Heffernan is a writer who covers air and water quality and ...

Running your furnace, central air, or heat pump probably constitutes a big part of your utility bill. But it’s a small, often inexpensive part—the air filter—that keeps these heating and cooling ...

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Gives you a better idea of when to replace your filter. Easy to install. Well-designed app. Air Quality Monitor works with major smart thermostat brands. Pricey, though it could save you money in the ...