It’s interesting because my sibling plus I both obtained houses around the same time, however on top of that, both of us both bought houses that needed HVAC system replaces.
Instead of the previous owners choosing some style of HVAC system to have installed, they left it up to us to choose our HVAC systems along with a discount on the houses.
We both ended up going for the same central HVAC systems. We were both proud new owners of nice homes plus both of us both had housewarming parties. Everything was good back then, however I observed over the years some extreme concerns with my sibling’s HVAC system. I observed first of all that the air quality was pretty bad in his house. It was just surprising to me that he seemed not to even notice that he had a extreme issue. I ended up saying something about the air quality because I was sad about his health, however he still acted appreciate he didn’t have an issue, however after that both of us had to point out his ductwork to him. I correctly had my ductwork system cleaned, although he didn’t have the ductwork cleaned even once. He was decreasing his air filters, although he was using harshly cheap ones. I told him about the importance of going for air filters with a nice MERV rating between 8-13 or even better. Of course when you go for the higher MERV ratings, you have to make sure that your HVAC system can handle that, because they can disrupt the airflow in your system, but you can typically have your HVAC system modified to handle HEPA filters or higher MERV rated air filters; My sibling ended up getting his ductwork cleaned plus he was surprised at how much the air quality improved. He also went for better air filters.