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AKA: Dirty Sock Syndrome (paraphrased), caused by the growth of mold and bacteria on the coil. Heat pumps (central HVAC) are particularly susceptible because, unlike conventional heat exchangers, their heating cycles are not hot enough to kill the microbes that thrive on their wet coils during the cooling season. Instead, the temperature is just warm enough ...


Same thing my the system in my house. Uses a MERV 16 5". Smell was the filter itself. Dont know what it picked up, but it was generating its own odor. Whew ! I think it started after I baked a beef roast. which smoked a bit when in the oven. Maybe something in rhe meat ?

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