I had a neighbor who used to bragg that he never maintained his HVAC system that he owned for over 20 years. He used to say he never got it serviced and never had a problem. He showed me the condenser and said "look it has a nice fur coat to protect it" and he would change his filter maybe every couple of years. He would get the cheapest filter he could find at Ollies or sometimes use the neighbors old filter they were discarding saying, "it still had more life in it". The only thing he did was he would pour a mixture of Mr. Clean and Top Job, so he said, down the condensate drain to clean it out. When I looked at the end of the condensate line it looked like it was all chewed up and falling apart.
Anyway, when he showed me the system it sounded like it was gasping for air like when you take a fish out of water. Making all kinds of vibrating noises which he said was good because that's how you knew it was working. When I entered his home it smelled of mold, terrible.
So, there are always two extreems when it comes to maintenance.
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