I looked on a few different HVAC web sites and I don't see parts listed except for  thermostats and complete electric baseboards.If hydronic, then yes, but you'd have to know how to drain the boiler, solder heating element to pipes, and refill/bleed all the air out.  

Your vinyl tiles will let air leakage happen between each joint. 

The run also must not be too long; our code says no more than 25 feet.Here's some specifics from the International Association of Certified Home Inspectors:The recommendations outlined below reflect International Residential Code (IRC) SECTION M1502 CLOTHES DRYER EXHAUST guidelines:M1502.5 Duct construction.Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces, with joints running in the direction of air flow.

Central Air?

To prevent people from going into real estate transactions and ripping all of the equity out from an uneducated seller. 

This will require these companies to have a separate Trust Account to prevent commingling.

It NEEDS air to drain right. 

I presumed because a tenant can easily put a lock on the bedroom door, preventing others from using the egress in an emergency.

What can i do to prevent mold from building up?

The flipper contractor has a better grip on his scheduling, (DIY Network shows notwithstanding), and the homes are usually vacant, where a PM contractor is usually responding to breakfix repair or preventative maintenance and must be able to work around a tenant's work schedule and household belongings.You should become a HUGE flipper, and then you can get great pricing, or own your own construction company, (which is where a bunch of our BP colleagues are going).