My HVAC unit had been omitting some strange odors for a week now. It was frustrating because it was impossible to stay indoors without some form of air freshener being sprayed. To make it even more disturbing is the fact that the smell seemed to intensify with time. It started as a musty smell but got stronger, and I was worried now. Because my parents would be coming over in a week, I did not want them to go to such an environment. My dad is very sensitive, and if there were something wrong with the air quality in my house, I would be forced to book them a hotel which will not be the same. I had missed my parents since they had taken an extended vacation and were only returning after two years. I wanted to host them for a few months before they could go back home, which meant that I had to fix the smell issue asap. I called the HVAC technician, and he had a few ideas to help us. First, we needed to identify the potential problems that could be triggering the foul smell. It could have been an issue with excess moisture in the air ducts or vents, which caused a hidden leak. Due to the accumulation of moisture, the aftermath would be a bad smell. However, my air vents were dry and perfect. Next, we checked the condensate line to be sure that everything was draining. It turns out that it was blocked and accumulated mold that was slowly spreading throughout the system. Surprisingly, I did not notice this earlier, but I had been so busy the past few weeks that the HVAC system was the last thing on my mind. The technician directed me on how to clean it.