HVAC Goes Out - Day 2 of Tenant moving in; Is $12k reasonable?

[Josh Edelman]

I just had brand new tenant move in. HVAC has been running great the past three years since I bought the home...until I get a call day 2 of my new tenants moving in. 

I got a technician out there, long story short I need to replace my HVAC. I have a 1724 sq ft home in Las Vegas. He is quoting me at $12K for a new 5 ton unit and labor. Is this typical? Thanks!