I've been working on it for 8 months (I have a FT J.O.B. so i can only work on it weekends) and i am only to the point where all the drywall (including ceilings replaced), new AC and duct work, removed blown insulation and replaced, reconfigured walls for open concept and rewired electrical. 

HVAC must have been hawked, none there any more, plumbing that was metal was recycled too.So, roof $6,400, plumbing, $1,500, HVAC, waiting for estimate, but should be around $8k with duct work,  paint inside $2k, new cabinets, sink, facet, d/w, counter in kitchen maybe $15k, bathroom fixtures for 2 bathrooms $3k, flooring (labor ourselves) vinyl laminate $4k, 5 broken windows after leveling house $300, leveling house $8k total for all this : $48,200.Total cost for the purchase and fix is $115k. 

If it's possible to run the vent down, you might be able to put one of those in the bathroom wall, fairly high up, and then run the vent down through the wall, into the crawl space, and through the side of the house.You can also get "remote" bath fans, which work kind of like a central air conditioner - you install a small vent grille in the bathroom, put the motor and blower above the ceiling or under the floor, and run ductwork from the grille to the motor and from the motor to the outside.

In my experience, the cost ranges from $3000-5000 depending on the size of the unit and the distance they have to run ductwork. 

If there is ductwork and a furnace there now, install a central air unit. 

If it already has a gas furnace and the duct work is all there you're better off sticking with the furnace.

Probably didnt need to pay the extra 2500 bucks for new hvac duct work, could have saved some money on the reno.

Probably didnt need to pay the extra 2500 bucks for new hvac duct work, could have saved some money on the reno.

$20k for 2 furnaces, 2 air conditioners, some duct-work and some drywall? 

We installed HVAC + ductwork instead of keeping the window unit, swapped the 120 amp panel for a 200 amp and changed the old cast iron and copper plumbing to PEX and PVC.New roof, floors, cabinets, appliances, light fixtures, paint, etc, etc, etc What made you interested in investing in this type of deal?