Leaking indirect water heater and inefficient AC

I’m buying a house near Worcester, MA, (zone 5). The house has two floors and a walkout basement. It has leased solar. It’s heated by an oil boiler with an… I’m buying a house near Worcester, MA, (zone 5). The house has two floors and a walkout basement. It has leased solar. It’s heated by an oil boiler with an…Read MoreGreenBuildingAdvisor