Where should we put this heat pump? How much insulation should we put on heat pump pipes? Where can we put them on roofs (and where can't we put them)? Where can they be put in the rear yards of NYC buildings? Are there simplified summaries of all heat pump code requirements? We answered these and many other questions in a new document on code and zoning requirements for heat pumps for New York City's Housing Preservation & Development Pilot Program.
Some of the requirements are limited to NYC, but most come from the International Code Council series of codes which are applicable everywhere. If you are designing or working on energy projects that involve heat pumps, you may find this document useful.