The card says ductwork and metal, and the metal part is meant literally. We fabricate and fit the sheet metal that moves air around your house, which is the half of a heating system nobody ever looks at and everybody feels.
People replace a furnace to fix one cold bedroom and are surprised when the bedroom is still cold. A furnace makes heat. The ductwork decides where the heat goes. A bigger furnace pushed through the same undersized run buys you a slightly warmer bedroom and a noisier house.
The other commonly missed half is the return. Air has to get back to the furnace, and if a room has a supply vent but no path back out of it, the room pressurises and the air stops moving. That is why having a door open or shut changes how warm a room feels, and it is a fixable thing rather than something to live with.
Our own jobs, our own photos. Not stock pictures of somebody else's basement.

