One of my least favorite responsibilities is my HVAC system. I never knew how much time and effort went into taking care of an HVAC system before I bought my first house. I thought my biggest responsibility would be mowing my grass, but I quickly discovered just how wrong I was. I have to pay an HVAC professional to come service my HVAC system at least twice per year and I have to remember to replace my air filter more than that. The air filter is the worst, because I never seem to have a clean air filter when I need one the most. Remembering to replace my air filter is already a stretch, so when I finally do remember to do it, I expect to have clean air filters on hand. For some reason, I never seem to have one. I was getting my air filters from the local hardware store because they came in a two pack and I thought the price was okay. However, when I went to replace my air filter the last time, I didn’t have one on hand and I didn’t have time to run to the hardware store. Instead, I decided to order a pack of filters online and have them delivered. I would replace it as soon as they were delivered. When I went to checkout, I realized that they had an option to subscribe and save 5% on every order. They would deliver new air filters to my house however often I wanted and I’d save 5% just for subscribing. I would never forget to replace my air filter anymore!