I can see this being a $15k job based the little info you provided especially if they have to install ductwork. 

I paid around 12-13k to have the entire unit replaced along with all the duct work. 1400sf home single story 3/2.

For air conditioning, the fuel is electricity and it is normally supplied through the duct work of a forced air system. 

  #2 And #3 have substantial ductwork required, drywall and paint that needs to be included, if not already. 

We general expect to have a lot of issues when we go into these houses, and since we will be opening a lot of walls to open the layout and install all the HVAC ductwork, we went heavy in the initial estimate for these issues we know we typically run into.

.- 2/1- Unfinished basement- Acre lot - Could use new roof & HVAC unit (duct work is good) - Two car detached garage with city water tap connected 2) Vacant lot - Can be subdivided into 2 lots according to city planning and zoning- One tap fee already there My plan was to separate the garage and the home, sell the home for $119,900 (I am an active agent in this market) tear down the garage and build a 1,400 sq. ft. home at roughly $80/sq. ft. and sell for $125/sq. ft. 

Greetings BP Family,Can anyone recommend a good HVAC company to install a whole new system plus ductwork in a Baltimore City townhouse?

Then ask for their duct design layout to ensure they aren't winging it and they properly size the ductwork system to carry the needed to condition the space.

We had to remove each piece of wood and then afterwards, scrape and spackle all of the walls in the building.The game plan was to replace all 20 windows, all the doors, and the majority of the trim, retile the bathrooms, sand all the hardwood floors, new kitchen cabinets and granite, backsplashes, new exposed duct work, etc.

There is no gas or ductwork.