My mother is trying to get a HEPA air filter

My mother needs to get an up-to-date air filter for her heating plus cooling device at her household. She wants to get a HEPA filter since she’s been learning a lot about how HEPA filters are the best for keeping the indoor air quality in her household at the highest possible levels. She is entirely paranoid about the whole coronavirus thing so she’s always looking for up-to-date ways to keep her indoor air quality levels at an all time high. Evidently, HEPA filters are able to catch more contaminants plus pollutants than other, cheaper air filters… My mother has always been an unquestionably thrifty lady so she has never unquestionably purchased anything other than the cheapest air filters out on the market up until now. She wants me to go to the local heating plus cooling device business to find the official sized plus rated HEPA filter for her Heating as well as A/C device. I don’t really know anything about heating plus cooling, though. I told her to send me all of the information on her air conditioning device plus then I will just give it to a single one of the employees at the Heating as well as A/C device business! They should be able to locate the right air filter for me if I give them all of the information. Then my mother says that she will change out the outdated air filters with the new ones herself. I’m blissful that she’s being proactive about things like this instead of resting around plus worrying about it. I suppose a HEPA filter will be excellent for her peace of mind!