We called the Wisconsin state inspector and he informed us that nothing is wrong with a shared furnace but it just needs to be separate cold air returns such as a common hallway it could not pull from inside a unit.

If we have worries about a specific system, ie heat&air, our contractors will look at it for us usually at no cost.

Another investor and I was going through a house and they opened it and the air was instantly nauseating throughout the house.

These projects allow me to get outdoors and get some fresh air. :-) By the way, I have one other part-time job that I do periodically and I've done it going on 12 years now.

HVAC stands for heating, ventilation, and air-conditioning.

(Open all the windows before you do this and put a fan or two in the doorways to keep the air moving!)

One region near me requires it in their possession within 24 hours of bid acceptance (usually 2pm the next day... which means its hand delivered or next day air early a.m.).

Is there too much or too little air exchange in the home with outdoor air.

Most older buildings have 8' ceilings, and everyone likes higher ceilings now.Newer buildings on the other hand are designed with more modern amenities, wider halls and restrooms, energy efficient heating/air and windows, wired for high tech uses, etc., and usually have more parking.

@Rich Weese Are you expecting to be all in on your build cost for $37-41 per sq foot under air?