There is a big wall heater in the living room, but since I will be putting in new window units, there is no need for it and I may remove it and seal it off.

I also noticed that the owner pays the heat, but the windows are old.

Good day,First, we already have our accountant researching this, and with the window closing, we were hoping to tap into the tremendous knowledge on this board.We are working on a project in which a developer is closing in on completion for a project, and we with a potential buyer.  

They speak of management needing to replace a window in the kitchen that was moldy. 

The air is probably just stagnant, open the windows.

For example, carpets, paint, window treatments, appliances have virtually no risk.

Lessons learned - If there are window air conditioner units in an eight year old house with central air then your evaporator coil is full of cat/dog hair and your compressor is bad.

Or if you happen to see a small window crack or hole, you can address it now before it gets out of control.

Also, some programs will not run on a Mac and you may need to run windows in parallel.

Would they be looking at the bedroom windows for egress?