This is only the case if the new furnace was undersized for the load. More efficient is more efficient, but if you put in an efficient furnace that's only rated for 1/2 to 2/3 of the load it has to supported, you're going to be cold.
Properly sized high efficiency furnaces with variable or two-stage blowers will run longer at a lower burn rate, and shift to 100% when needed.
beren0073 t1_j5fcvbs wrote
Reply to comment by av-gas in My face when I saw this months gas bill. by bearsharkbear3
This is only the case if the new furnace was undersized for the load. More efficient is more efficient, but if you put in an efficient furnace that's only rated for 1/2 to 2/3 of the load it has to supported, you're going to be cold.
Properly sized high efficiency furnaces with variable or two-stage blowers will run longer at a lower burn rate, and shift to 100% when needed.