Installation men were very efficient, courteous & cleaned up after installation. My one complaint is the furnace would not start due to a wire not connected from factory & technician had to figure it out & fix. Plus when furnace installed my outer door to furnace would not close. Furnace was bigger than my previous one thus not being able to close door to furnace. Another problem is vents bent on furnace door in some places. None of these problems were the fault of the installation men.