Investors & landlords

What is the verdict on this?  , similiar situation here.  HVAC went out, leaked all over the carpet and into the pad where it molded...(they didn't notice the wet carpet for whoever knows how long).  Ended up having to go with new HVAC because they don't make the one bad part for one we had, and also new flooring in the area around the HVAC and surrounding area.   We did do the other half of the house too, and I understand that's an improvement, but wouldn't the HVAC and half of the flooring be a repair?   We didn't have another option other than a new system for the HVAC fix, just like this guy and the bathroom.