The Truth About Air Filters

The Truth About Air Filters

If you are like me, you are interested in the truth.  But when you go down the rabbit hole, things start to look very grey. Take furnace filters for example: I was at Home Depot and I was staring at wall-to-wall furnace filters. The prices were all over the place, from as low as $3.00 and going well over $50.00 for a single filter. And as a price, but also value-conscious consumer, I pulled up my phone and started Googling air filters. Then, in frustration, I bought a mid-level multi-pack. It is impossible to find a true answer, because everyone has stakes in the game. Home Depot employees would tell you, buy the HEPA-whatever because the store makes more money on it. An HVAC (Heating Venting Air Conditioning) specialist would tell you that all those filters are crap and what you need is an auxiliary system to scrub your air clean (for over $1000.00). Who is going to tell you the truth? I will tell you the truth. Well, as best as I can ascertain. How Your Filter Works Before I tell you what to buy, I would like to teach you what is happening in your HVAC system, assuming you have a forced air system. If you have a boiler system, then open a window. When your furnace turns on, air is drawn into the system (from an outside vent and also though large inside air-return vents) through the air-return ductwork. It is that large circular or rectangular box that runs along your basement ceiling. The air passes through the filter that is mounted between the air return...