I’ve been trying to maintenance my cooling system unit for a few weeks now. It started giving me trouble after I heard a hissing sound coming from the condenser unit. I knew that sound wasn’t good, so I did my own research plus found a couple possible solutions. I ended up tightening the coils plus fan blade because that was what I thought was the largest issue… Despite giving it my best efforts, it still didn’t maintenance the concerns I was having with my AC unit. Technically, the hissing sound disappeared, however then I began experiencing other concerns. In hindsight, I should have hired an HVAC serviceman, although I was convinced that I could do it myself plus save some currency, however after the hissing sounds disappeared, I went to change the air filter. I will admit that I was ashamed by how long I’d let my HVAC system run without replacing the air filter, plus I had a good assume that it could be the reason my AC system malfunctioned. After I upgraded the air filter, I waited for my AC unit to beginning running smoothly again, however it never did. This is when I decided that I needed to hire an actual HVAC professional to come handle things officially. I told the HVAC professional all about my attempts to maintenance the AC unit, but she wasn’t impressed. She ended up lecturing me about how I should have called him sooner, because I could have caused a lot of extreme harm since I didn’t know anything about HVAC equipment.