Manchester is a mill city, and the buildings still behave like it. The Amoskeag millyard is brick, timber, tall windows, and flat roofs with parapets, much of it turned into housing that was never drawn as a house. Around that core, wood blocks built for mill workers line the West Side and the older streets, while the North End and Rimmon Heights mix later capes and houses with the same winters and a different shell. Hallsville and the blocks toward the Merrimack each carry their own version of old.
A mill building loses heat through glass and volume. A worker's three-family loses it through a thin wall and a tired roof. Internal drains in a flat mill roof clog and then overflow where you cannot see them. Ice in a valley over a wood house shows up in the plaster. Brick stays cold. High ceilings make a heater look busy while the floor stays chilly. None of that is solved by pretending the Queen City is a row of new colonials.
The river is the edge of the story, not the whole story. Moisture in a mill basement, a hidden leader, and a yard that is mostly brick and loading court are millyard problems. A North End lot with trees and a pitched roof is a house problem. Say which building you are in. The trade changes with the brick.
Policy calls should start from your deductible and your pages. A unit in a converted mill and a house on a side street do not present the same claim. Water from a flat roof, a burst pipe in a tall stair, and a river-driven backup are different causes. Flood and backup are often outside a standard homeowners policy. Ask about yours.
Bring the building, mill or house, and the floor where it shows. Roof, windows, bath, heat, pests, pipes, the little yard, or equipment on a roof that was built for looms, not for mounts. Pick the trade and call.