Hotdogs with a side of air conditioning system's knowledge

My children could not stop talking about how delicious the hotdogs and the new hotdog stand down the street were, and the dogs were wagging their tails, ready to go for a walk. The six of us decided to go out for an afternoon snack while walking the dogs. The kids were right, and the hotdogs were so delicious that I had to go for a second. My partner got into a conversation with the owner of the stand. He mentioned something to do with air purification systems, and I immediately asked him if he knew a good air purifier because for two years now, since we brought in the dogs, our indoor air quality was not what it used to be. We also had to replace our ac filter so often that we eventually switched to a washable filter. He asked us when was the last time we had our ductwork checked, and I told him that we usually checked the air ducts to see which parts needed sealing. We talked for a while, and it was clear that he knew so much about air conditioning systems. He told us that he once worked for the local home services business that dealt with HVAC maintenance, ac repair, and services, but he was now retired. He told us how nervous he was during his first air conditioner installation because he somehow managed to install it the wrong way the previous day. The HVAC company had to send a different HVAC technician to rectify his mistake. The retired HVAC professional told us what we do with our HVAC unit to help with indoor comfort.
Residential HVAC