When I hear someone tell me that their air conditioning system is not working well, I wonder just how long it has been since they had some regular HVAC maintenance performed. I’m no longer surprised when I hear from the user of a non-working heating or cooling equipment. It seems only natural to me, but then again, I went to school to learn all about heating and air conditioning, so I understand that if you, as the user do not change your air filter, eventually, something will go wrong with your HVAC system. It’s only a matter of time. When was the last time you can recall changing your A/C filter? There you are. If you can’t remember doing it, you probably did not. So what then is happening to your dirty air filter while it is in use? I will tell you that it is helping to force the rest of your HVAC system into working harder to keep you cool in the summer or warm in the winter, and if you have any allergies or breathing issues, you most certainly want to change that air filter as soon as you can. Go ahead and buy several while you are at the hardware store, that way you will have a new air filter when you need one. In fact, if you or someone in your family is a regular sufferer of allergies, you most definitely want to call a local HVAC company and have them perform both an HVAC tune-up as well as a cleaning of the ductwork.