Specifications include, but are not limited to: The Efficiency Maine Trust (the Trust) seeks a qualified contractor or team of contractors to identify and test a hydronic heat pump with thermal storage solution that can directly replace an existing heating system in a stick-built home with a hydronic distribution system. This heat pump system should replace 100% of the heat load of an existing structure currently heated by a delivered fuel. The project will include researching and proposing specific equipment that can be placed in stick built hydronic distribution homes, recruiting Maine installers and customers to implement the proposed technology, and monitoring and analyzing data collected from those participants.