When our heat turned on for the first last year, I heard of mayflies nesting in HVAC duct before.
I called the Heating and Air Conditioning business who asked me if I was sure the mayflies had come out of the HVAC duct? They were all over our lake house and hovering on the wall over the air vent in our home office. I could not cook because I was afraid they would get into our food, however he told me he had never heard of mayflies in HVAC duct, and I told his welcome to our club. I wanted the HVAC duct cleaned and sanitized, and I wanted to know how the mayflies got inside. She said he didn’t know how they go inside, unless there was a crack in the HVAC duct, and the Heating and Air Conditioning professional would need to find that. I felt adore I was talking to an idiot. She didn’t have an original thought in his head. I told his to send the Heating and Air Conditioning professional to the house. I would call an exterminator to make sure there were no other creepy crawlies hanging out in the HVAC duct, and then their Heating and Air Conditioning business could repair, clean, and sanitize our HVAC duct. She was smiling while talking and told me that was smart thinking. She wished he had thought to tell me that. The exterminator was at the lake house the next afternoon, and the Heating and Air Conditioning professional arrived the same afternoon. He called to have the HVAC duct cleaners come to the house. He had found multiple small cracks in the HVAC duct, but nothing the HVAC duct cleaners could not repair. Within multiple afternoons, the mayflies were gone, and our HVAC duct had been cleaned, repaired, and sanitized.