Replaced flooring, HVAC Duct work, Hot Water Heater, Light Fixtures, roof and a fresh coat of paint.

Rebuilt everything except duct work, original plumbing, most wiring What was the outcome?

I don't even do some of the jobs any more and I can come within 10% even on oddball stuff; one of my rentals we recently replaced the air handler, replaced the outside unit, and relocated the air handler into the attic and replaced some of the ductwork.

I am not adding any fees on the asking price.Details - House is in TN3 beds, with one bonus room downstairs with no windows4 baths4500 sqftroof around 15 yrs (pics have black mold, cleanable with bleach)AC units around same age, working but one needs 200 duct work and other needs new freon and leak fix.No foundation issuesBiggest concern imo would be the mold.Below are a few pics.

The duct work can collect grease residue and become a potential fire hazard.

Do they even have units which don't require any kind of duct-work?

I missed the fact that there was no ductwork ran to the mother in law suite until after it had already been drywalled.

We replaced the roof, HVAC, duct work, water heater, kitchen appliances, kitchen cabinets, floors, renovated both bathrooms, light fixtures, paint, major landscaping, and much more.

Depending on the age of the house its possible that there is an old boiler and radiators and no duct work. 

LVP flooring and new carpet throughout. new duct work. landscaping.