Today I performed a full HVAC system replacement. The existing 15-year-old furnace and air conditioner were failing and inefficient. I installed a new Lennox ML193 80% efficiency gas furnace along with a Lennox XC25 2.5 ton 25 SEER air conditioner. The evaporator coil is a Lennox X6670. All new R-410A refrigerant lineset was run as well. The homeowner can expect many years of reliable, energy-efficient heating and cooling from this quality Lennox equipment.