Why can’t I have an all-beach house air cleaner installed?

I have an older Heating as well as Air Conditioning system and I wanted to have an all-beach house air cleaner installed. When the Heating as well as Air Conditioning worker arrived to inspect my Heating as well as Air Conditioning system, he told myself and others he didn’t think it would work. I needed to use HEPA air filters with the air cleaner, and my Heating as well as Air Conditioning system wasn’t made to use HEPA air filters. I tried to understand what he was telling me, but I was have a mind block. I could not wrap my mind around what he was trying to explain to me. He brought a HEPA air filter in from his service van and shoed myself and others the difference between my air filter and the HEPA air filter. He said they also had UV lights in the air cleaner. I could have the air cleaner if all I wanted was the UV light system, but I could not use the HEPA air filter. Some people chose to use just the HEPA air filter and not the UV light, but I didn’t have that choice. He told myself and others that if I wanted a whole beach house air cleaner with a HEPA air filter, i would need to get a newer Heating as well as Air Conditioning system. I could not afford to get a modern Heating as well as Air Conditioning system, and I told him so. He asked if I had ever thought about purchasing a portable air cleaner. They worked just as well, but I would need to have a single for each room, or switch the portable air purification system from room to room. I didn’t prefer the inconvenience of this either, so I gave up on the idea.
Air conditioner tune-up