HVAC is nearing the end of its expected useful life.

[Karthikeyan S.]

When a Turnkey home inspection report has a comment "HVAC is nearing the end of its expected useful life. Servicing and assessment by a qualified HVAC technician are recommended", how are we supposed to negotiate with the seller?

1. What should be minimum life expectancy for a HVAC system when the property is called as a turnkey property?

2. Average end to end cost to replace a HVAC in states like AL?

3. Can HVAC specialist certify that this HVAC system can run for additional X years?

4. If seller is not ready to fix, how much seller credit should we negotiate?

Please suggest.