Older, larger homes mean larger scopes
Scarsdale and the surrounding communities are full of large prewar and early-postwar homes with multiple heating zones, oil-to-gas conversion histories, original cast-iron radiation, undersized electrical service, and slate or tile roofs. New Rochelle and White Plains mix substantial single-family housing with condominium and co-op stock. Yonkers and Mount Vernon add dense two- and three-family buildings alongside older single-family neighborhoods.
A three-zone hydronic system in a 1920s colonial is not a comparable job to a suburban split-system swap. Scoping it properly requires knowing the fuel type, the number of zones, the age of the equipment, whether there is an existing service history, and whether the homeowner has already had another contractor look at it.