Personal story… I am selling a personal property right now with an HVAC I replaced in 2013. I had it serviced before listing and the company recommended $700 in repairs. Of course I didn’t want to spend $700 on repairs, and I debated about whether they were really necessary, but I did it anyway. Because I know HVACs are a major system and that matters to buyers. I paid to have those repairs done in advance, because I know a buyer will want to see that the HVAC is in good working order. Now I have the paperwork to prove that it is in tip-top shape!