Hello ,just stumbled across this site and have a question , what would be the recommended system for new house 2 story 4300 sq ft conditioned space , was thinking 4 zones , will have r42 2 nd floor ceiling r 27 walls . was H.E. wall hung but been seeing lots of maintenance involved . whats the highest rated propane boiler that is not so high tech and what would be the most cost effective way to go . Was thinking hydronic system with 2 air handlers to handle the a/c units , any thoughts would be appreciated .
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