Haunted HVAC system

I don’t believe in haunted houses, well not anymore I don’t. When I was a little girl the situation was far different, and I could have sworn I heard things moving in the attic late at night. My dad told me it was probably just rats, which wasn’t as comforting as he thought. I am actually not sure if I prefer rats over ghosts, both of them make my skin crawl. Like many things, as I have grown older I have come to understand the fears of my youth and what caused them. Any old fears I might have had have been dispelled by working in the HVAC industry. Sounds silly, maybe, that being an HVAC technician would help me put old ghosts to bed, so to speak, but it’s true. By working with ductwork, old furnaces, and water heaters I have learned about all the different “weird” things they can be responsible for. The low moaning of ghosts I heard as a kid was no doubt just a crack in one of the air ducts, allowing outside wind to whistle through the ductwork. The strange cold spots in our house, which I used to think indicated a spectral presence, were probably the result of coolant leaks from the air conditioner. The sudden blast of heating from the air vents whenever the furnace kicked on would blow around the drapes, making it look like they were moving on their own. All those strange little things I remember have all been proven to be totally natural by my HVAC work experiences.