At the estimate visit, the installer should measure each room, look at windows and insulation, and discuss where line sets will run. In older East Bridgewater houses with plaster walls and tight attics, routing the lines neatly takes planning, and some owners choose exterior line covers painted to match the house.
Most installs take a day or two. The crew mounts the outdoor unit on a pad, stand, or bracket, sets the indoor units, drills small wall openings, runs the line set and condensate drain, and wires the system. An electric permit through the Building Department's online system is typical, and the electrical inspector checks the new circuit.
Before the crew leaves, ask them to walk you through the remote or app, filter cleaning, and how the system handles defrost in winter.