Replacing of furnace filters more often on the smoker's unit is important to keep the furnace working and to prevent more nicotine residue from getting into the air ducts.

HVAC ducts could stay but I would want to replace everything else for the HVAC.

There's nobody to tell us what trees to cut, what colors are acceptable to paint the home, when to mow our lawn, what kind of vehicles can be parked in the driveway, where to place our garden hose and trash can, etc.

Maybe the carpet is a different color where the sofa was.The existing tenant may not actually move out on the day they said they would.

Offering different options as finishing material such as colors, flooring, cabinetry and etc. 

My parents, who found it, say it could use another coat of paint on the walls to mask the old colors and hopefully the mild smoke.

You want something that everyone recognizes as normal.Back to the exterior: you want it to be in obviously good exterior condition and have a fresh coat of paint in a normal color scheme.

AP cases that involve color of title are unique in terms of how they are possessed.

A fairly new home that was built in 2007, but the previous tenants had pets that they never let out to use the bathroom, and kids that liked to color on walls, etc. 

Expensive to install all the duct work.