We investigated various heating/air conditioning options to try to minimize the number of ducts needed and to minimize the space lost due to adding ducts. We looked at using mini-split heat pump units which are completely ductless. We originally favored this option because it allows you to adjust the temperatures separately for every room thus saving energy. But we decided against this option. We received some negative feedback which indicated that it was very difficult to find experienced technicians who could install these units correctly. The failure rate of these units if very high if they are not installed properly; they also have more failure points than the traditional HVAC system. We also looked at using small duct systems including Unico and SpacePak, but we found these systems to be very expensive. So their cost prohibited us from using them.
In the end, we decided to go with a traditional HVAC system. So we knew that we would have to come up with a location where the ducts and returns could go from the attic to downstairs. So we decided to give up a portion of the upstairs kitchen. That unit is smaller, so the kitchen could also be smaller.
Raceway from attic to the bottom of the house was created to run the ducts and returns.
We also needed to find a place for the outdoor HVAC units. The house still had the original brick walls that were previously used to hold up a cistern. The cistern was no longer there, but the brick walls remained. We decided to repoint the old bricks and then build a platform on top of them for the HVAC units. The other option would have been to knock down the old brick walls,and place the units in their place, but we wanted to keep the old historic brick walls.