Replacement costs between $1,500 and $4,000 represent 40 percent of total HVAC value

https://blogfreely.net/lithilszxt/sizing-accuracy-determines-whether-youll-need-hvac-replacement-within-15-years

The compressor is the most expensive part of an HVAC system, with documented failure-rate metrics and cost-ratio data showing replacement costs between $1,500 and $4,000, which often represents 40 percent or more of a full system replacement budget