I usually charge an additional  $ 50/month for a pet with a stipulation sometimes they have to have a professional clean the HVAC ductwork upon leaving (Pet hair).

I was already down there doing some duct work repair, so it's a great idea to turn on all the water sources and check the drains.    

Installed Ductwork and HVAC

You could run the lines up the interior of the wall and down to the handler and have a plentum on top, but your duct work will run through the attic, but I don't think that would be a problem.

Asbestors can be found in old boilers, duct work, attic and insullation, floor tiles and rolled flooring, old carpet pads and in plaster and lath.

So, if you pull an electrical permit to move some wiring and the inspector notices that the plumbing, insulation and duct-work aren't up to code, he can require you to fix all those things as well.So, if you plan to pull any permits, you should be budgeting to fix anything in the house that's not up to code, just in case the inspector calls it out and requires you to fix it.As an example, I finished a property a couple weeks ago, called for final inspections and the inspector required me to replace the bathroom window with a tempered window.

Based on what I saw in the pics though 25K seems skimpy.Looks like many of the windows may need to be replaced along with a furnace and looks like some duct work.

If not, is ductwork included in that price?

For rent of only $525 a month it's not worth it to fork over the $$$ to put in the duct work for central air (the house never had it in the first place) and at just under 800 square feet these two units plus three ceiling fans provide enough cooling.Interestingly enough, we were recently doing some work in one of our larger older homes where we'd replaced the HVAC unit about a year ago and I soon wonder why the heck I bothered. 

I have walked in to one property in the middle of winter here I believe the high was around 20 degrees that day, and apparently  the owner told the tenants he was installing a new package unit prior to the foreclosure, and pulled off the unit leaving the giant opening to the outside where the cold air was running through the duct work through the entire house.