The answer to 'which is better single stage or two stage furnace' is that a two-stage furnace is generally considered better than a single-stage furnace. Two-stage furnaces offer more efficient and precise temperature control, leading to improved comfort and energy savings for homeowners.
The key difference is that a two-stage furnace has a high and low heating capacity, while a single-stage furnace only has one heating level. The two-stage design allows the furnace to run at a lower, more efficient level for most of the time, only engaging the higher capacity when more heating is needed. This results in more consistent temperatures, reduced temperature swings, and lower energy consumption compared to a single-stage furnace.