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I put this in the oil heating wall but it' probably better here...
I'm raising my roof and adding a full second story on my 1 story ranch. I currently have hot water radiators in my home, and the furnace is vented out of a chimney located almost right in the center of my house. The oil burner is 60 years old and needs to be replaced. I also have an old central air system that is going to be replaced if it's in the budget. I was told that I can direct vent a new high efficiency burner out of the wall eliminating the need of my chimney (I don't have fireplaces). The guy who told me that also said I should put forced air heating in the second floor because I can use the same air handler as the a/c and it's more efficient than radiators.
I'm a plumbing/hvac novice at best. Can you guys please help me with my options and what equipment will need to be purchased? Do I go radiators for heat and a separate A/C unit or should/can I add all forced air in the addition (heat and cool)?