How well do you understand how furnaces work?
Now I'm not a furnace expert but I am a home buying expert, and I
think there is something wrong here.
Do you recognize the problem?
Update:
I looked up some installation instructions for the bank service person:
http://www.htproducts.com/literature/lp-166.pdf
Here is another:
http://www.dnmech.com/lit/good_dcvk_IO-619A.pdf