Heating in SomervilleTwo kinds of property, two kinds of answer
Ask ten Somerville households how they heat and you will hear two stories. Inside the township, the brick veneer homes built from the 1980s to the 2000s are on mains gas, and most have a ducted gas heater in the roof with a cooler of some kind added later. Past the last street, on the acreage, orchards and horse properties, mains gas often does not reach. Those houses run on a wood heater, LPG bottles or a couple of old wall units, and many have never had a duct in them.
We treat them as separate jobs. The township house keeps its ducted layout but changes everything that feeds it: gas heater and old ducts out, ducted reverse cycle and new R1.5 insulated ducts in, heating and cooling from one machine. The rural house gets a multi-head or split systems in the rooms people live in, which avoids building a duct system through a roof that was never designed for one and ends the run to the bottle yard.
Being the local company changes the after-sales side as well. When a filter light comes on or someone wants a zone renamed, the technician is coming from Speedwell Street. It is one reason we would sooner size and install a system carefully the first time. The rest of what we do around town is on the Somerville page.