You now have experience in the WORST design of heating you can find. This was done to cut corners so the former homeowner could get by or own a Mercedes while living in cheap misery. This MODERN house has a wind chill system and ancient concept gravity warm air heater on an INSIDE wall, the worst possible place to put one. The blowing air in the winter system was installed to have a month or two of cooling with the heat as an afterthought.
Surrounding this home are older houses with steam heat for a century or hot water systems. Hot water baseboard NEVER blows cool air or settles the hot air at the ceiliing; it RADIATES heat to the people and keeps the outside walls warm. It is possible to install a boiler to provide baseboard heat on the outside walls in the garage addition, and put a hot water coil in the ductwork of the house section, make more hot water than ever needed, melt the snow from the driveways, and heat the hot tub and jacuzzi, with NO duct losses.
Rhode Island is in the heart of gas and oil heating with some of the most experienced plumbers in hot water heating in the world.