A good estimate visit takes time. Expect the installer to measure rooms and windows, look at your ducts or radiators, check the electrical panel, and ask how you use each space. In a house from the 1970s, they may also test the existing ductwork before recommending a ducted system.
Permits come next. East Bridgewater's Building Department handles building, sheet metal, and electric permits through the town's online permitting portal, and the electrical inspector reviews the new circuit. Ask the installer to list each permit on the estimate and to book the inspections.
Installation itself usually covers mounting the outdoor unit, running the refrigerant line set and condensate drain, wiring, and setting up controls. Before the crew leaves, ask them to show you how the system handles defrost and what backup heat, if any, it will use on the coldest nights.