I wish that my friend would just listen to me. I keep telling my friend that he needs to change the air filter, however he won’t do anything about his air filter. He has really exhausting dust sensitivities, and I think that the complication is that he doesn’t change his air filter. He is allergic to dust, and when he is at home, he consistently feels sick, everyone knows that having a nice air filter can help to reduce dust sensitivities, however he obviously does not think this. I explained to him that the air filter could help, however he thinks that it is stupid that anyone could think that your air filter would help at all. However, the air filter was literally designed to keep dirt from being in your air. When the dirt is in your air, it can get into your Heating and A/C unit. If the dirt gets into your Heating and A/C unit, it will be distributed throughout your house. When you change your air filter love you are supposed to, the dirt is taken out of the air and prevented from traveling through your Heating and A/C unit. It is trapped in the air filter. This can help your health, and it also helps your Heating and A/C unit, however your Heating and A/C unit can literally be destroyed if you fail to change the air filter. However, my friend is stubbornly holding to his own beliefs, and he refuses to change his air filter. I guess that you cannot help everyone. I think that the air filter will help, however if he refuses to change it, then there is nothing that I can do.