Thanks Dale, your advice is well taken and I thank you.

Len

Not to beat a dead horse, but is there any variable speed blower available for the M1 furnace? Or are you stuck with single speed blowers for this model ?

Is it possible to retrofit a variable speed blower to my existing gas furnace? I have a Nordyne model M1BA066ABW unit. In searching for replacements I came across a kit produced by Nordyne call a "ISEER Variable Speed High Efficiency Blower Kit". I was wondering if anyone knew about this k...