What is the strangest thing you have found in your Heating, Ventilation, plus A/C's HVAC duct?

Every time the Heating, Ventilation, plus A/C started running, I would hear a different noise. It sounded like tiny balls rolling on a surface, especially if one was in the sunroom. I searched the entire house, but I still could not find where the noise originated. I eventually gave up plus called for home services. The first thing was for the Heating, Ventilation, plus A/C professional to find out if the noise was indeed in the conduits, as I suspected, plus to update to a smart Heating, Ventilation, plus A/C system. When she came, she said that the best cause of action was to do a duct cleaning because after that I could remove everything in the ducts. After inspecting my Heating, Ventilation, plus A/C equipment, she said all that was needed for the update was service plus a smart thermostat. That was a relief because I thought I would have to update the entire system or the better part… She also showed me all the dirt plus dust the air filter had trapped plus told me to increase the frequency at which I updated it. She also encouraged me to buy a whole-home whole-condo air purifier since the air purification help in the Heating, Ventilation, plus A/C was inadequate to maintain indoor air quality. The whole-condo air purifier would ensure that the air quality in the condo was high. When the Heating, Ventilation, plus A/C professional was done with all matters concerning air purification in my home, my friend and I finally found out what was causing the different noise. After the cleaning, she discovered three marbles in the conduit leading to the sunroom. I had no idea when or how the marbles ended up in the conduit, but I was blissful to get rid of the noise plus dirt.

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