hmm, thanks. I am not saying the air flow is not the issue, but I really don't think the same issue existed before the motor replacement. Thinking back, it is obvious something is different from before, such as less strong air flow, temperature rises more slowly, not to mention the cold registers. I am leaning to the motor speed theory and hope that will not cost me more money.
with the furnace replacement option, I am so hesitant to spend more money on an old furnace, even for a service trip fee.