What do you guys think about going with a multi zone set up for the duct work and getting a cheaper, lower quality furnace to hold us over for a few years while we save for a geothermal heat pump and put that in ( as I undestand this replaces the need for a AC condensor?)
Is it accurate that the difference between a 92 and 95% furnace is all but irrelivant if you have a geothermal heat pump?
If you have over sized cast iron radiators, and you improve the insulation and air sealing in your home, you may be able to use a water to water geothermal heat pump with your hydronic system. At least for most of the winter. If you are set on tearing out your boiler and radiators, so be it. Just realize, that old does not necessarily mean inefficient. These old systems combined with modern technology, can be the most comfortable and efficient systems around.