I am analyzing a potential flip opportunity in the Chicago-land area and I am wondering if anyone has previous experience in adding duct work and forced air units to an old house. 

I am airing on the side of caution saying 215k.  

One bedroom is my home office for the fashion brand, the other is mine, and the third I Air BNB, bringing in between $1000-$1500 of extra income per month, which goes straight into a savings account. * My budget: I have $10k currently set aside to use towards investing in real estate, and I have another $10k safety net available. 

Dentists need high pressure pumps, extra sewer lines to each chair, heavy mounting for xray or other machinery.

This also puts some time pressure on the applicant to make a decision.

It has central heat and air and a bathroom already rough plumbed.

-A few abandoned air ducts left in the attic, not attached to anything.

It will cost you 5 to 6% of the selling price.It will result in many lookie loos wondering through your home, letting their kids destroy things, casing the house or stealing your things, etc.If its a vacant, furnished home it may become your agent's love nest.They can leave the air -heat or air conditioner- on in vacant houses. 

Hi,My PM company informed me that they received a maintenance call on the HVAC blowing hot air instead of cold.

Paying for them can be, but is not always, a way to get them faster. 3) this forum has a lot of knowledge, but also a lot of hot air.