Something got inside the air duct

I was just thinking that i’ve had to have a heating and cooling contractor out to the house 4 times this year already to fix my furnace. I’m wondering if buying this furnace was actually a mistake. The idea was to save money, but I’m stuck wondering if that’s really what’s happened. I bought this furnace off a pal of mine who does HVAC work for a living. He had taken it out of someone’s home who had upgraded their system, but the current furnace was still new. He offered it to me for almost nothing! I thought I had finally gotten a deal! Not long after, I was on vacation, and the lady watching my house called me to say that the furnace had broke down. I couldn’t do anything about it until I got home, unfortunately. Nothing in the house was damaged, thankfully. The time of year was luckily not too hot and not too cold so all of the pipes and things were good. I had an HVAC worker come out and fix it and that was that. Not even a month later, I went to visit my sister, and don’t I get a call saying my furnace isn’t working again! I was so angry. Every time I go away something happens with that furnace to make me all stressed out. Not only that, I was shoving out cash left and right to fix this thing. It was supposed to be saving me money, not costing more! I don’t think that I made the right decision in purchasing the furnace used. I don’t really feel like I’m saving a lot of money, and the hassle alone really isn’t worth it.

HVAC service plan