Since 1958, Allied Lennox International HVAC has provided world-class home Comfort systems that stand the test of time. We're confident that our A Series Split System Furnace will do the same. Count on unmatched comfort, time-tested performance, and exceptional energy savings found in systems designed, engineered, and assembled right here in North America. It's what has made On Time HVAC a preferred choice of contractors and homeowners for generations.