Honeywell RTH6580WF vs Lennox iComfort S40
Looking for an honest Honeywell RTH6580WF vs Lennox iComfort S40 comparison in 2026? We scored both smart thermostats on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. In our overall scoring the Honeywell RTH6580WF comes out ahead 47/100 to 24/100 — a 23-point gap. The widest gap is in design and build, where the Lennox iComfort S40 pulls noticeably ahead. On price the Honeywell RTH6580WF undercuts the Lennox iComfort S40 by 838% ($39.99 vs $375), which materially changes the value calculus for budget-conscious buyers.
