Something that I had to learn the hard way was changing the air conditioning filter too late. I figured the filter would probably last longer than what they say. They always say to change out the air conditioning filter at least once per month. I figured mine could probably last the whole summer season without any problems. Well, I was dead wrong because near the end of the warm season, my system entirely failed. I came to find from the HVAC technician that came over for repairs, that my system overheated. He said it was definitely because I failed to change the air conditioning filter! He said the filter was so clogged up, that it was obvious it was the culprit behind the overheated A/C system. He said that I was lucky because it could have been worse. He instructed me to immediately change out the air conditioning filter before I turned the A/C back on. He also recommended the HEPA filters because they worked a whole lot better than the cheap filters. They would improve the air quality in my home and keep my system a whole lot cleaner also. He also let me know that it wouldn’t hurt to get my ductwork cleaned too. I suppose he knew that if I failed to change my air conditioning filter, it also made sense that I probably never bothered to have the ductwork cleaned either. If he was thinking that, he was definitely right because I’m sure that I have never had the ductwork cleaned for as long as I’ve lived in this house.