My house is about 1800 sq ft. Is it worth it to get the two stage and/or variable speed model (w/ an ECM motor)? Are they any less reliable? I assume they will have higher repair costs if they are. I understand that GE makes the ECM fan motors for most furnace companies. I'm also considering replacing the old inside (evaporator) A.C. coil for $400 now while the ductwork is being worked on, with the expectation of replacing the outside unit with a matched Am. Standard model in a few years.
Am. Standards also has a free humidifier in my area offered with the variable speed unit, although I'm not sure I need that-due to condensation on the cold days when you want the humididy. Thanks for any advice!