Does your upstairs always feel warmer or cooler than the main floor? A two-stage furnace can help. It runs on a lower setting most of the time, so its heating cycles are longer and gentler and spread warm air more evenly through two-storey homes. It also runs quieter and cycles less, which reduces wear. Learn why a two-stage furnace is the most popular choice for Calgary family homes and how it compares to single-stage and modulating models.