My home "forced air" gas furnace has a mechanical device composed of a "sprial bi-metal" and "electrical contacts" that turn on and off the furnace blower motor based on internal furnace air temperature. It is mounted on the front of the "hot air chamber". This "blower control" can be adjusted by moving two external "tabs" to trigger the the "on" and "off" sequence at different temperature settings. My problem is the "adjustment" between the blower not shutting off at all and shutting off to soon .. causing several "30 second" on-off cycles" .. is 1/8 of an inch. I think its time for a replacement.

Instead of putting in another "bi-metal mechanical device" is there a "solid state/electronic" blower control that is easier to adjust and more linear in response.

Thanks in advance.