I had a major install performed- completely remove old HVAC system from a downstairs closet, install the new system in the attic, add 5 new return air lines, and update exitsting air ducting. I now have a SEER 20 fully variable Trane system with 3 zones. I am beyond impressed! The system heats or cools only in the zone where it's needed, there's no more hot or cold spots in the house, and it is uber efficient. Service Masters is a great company, and they have great technicians. The price was fair and well worth what we got for our money. Best home improvement we've ever done.