Replaced builder's 20 year old system with new Lennox system. Every step in the process was handled efficiently and professionally. We were a little concerned because we scheduled the work for what turned out to be the hottest (so far) day of the year, but by 2:00 the new system was operating. Everyone we had contact with was friendly and courteous, and the installation team did an excellent job of cleaning up. Two parts, a circuit breaker and a gas line fitting, which do not affect current operations, were listed for a follow-up and inspection.