Variable speeds unlike an on off psc motor a furnace ecm motor can operate at a range of outputs between zero and 100 percent.
Single stage furnace with ecm motor.
I m sticking with single stage as all the contractors recommended them.
Be sure to not use the built in staging timer if you go that route.
Is it worth getting it with a emc motor i do not have the fan on all year round and the furnace is only on 5 6 months for winter and on and off for 2 months of the summer.
And the ecm motor will have greater electrical efficiency.
With a 40k low stage the 2 stage will not be a reduction in comfort or gas efficiency over a single stage furnace.
Keeprite bryant and carrier offer single stage with ecm motors.
This increased precision results in a home that is more consistently heated both in different areas of the home and over time.
So if those are your 2 options at the same price i d go with the 60k 2 stage.
Instead either use a.