I was wondering if it’s better to add more supply vents as the airflow seems fine from the existing vents, but there are just too few of them (and spaced too sparsely in the house).

I found this How to Transfer a Section 8 Voucher to Another State page which basically has the info @Nathan G. said, with slightly more detail.I think it's a supply and demand thing.

The syndication supplies the 100% bonus depreciation benefits, yet it will always be on the investor to work with a CPA to best receive said depreciation. 

Mix in the energy crisis and blackouts due to supply storages of coal and things look pretty bleak for China.

Took down non-load bearing wall, added/framed a new bathroom, all new electrical, fixtures, appliances, stone countertops, 1100 sq ft of luxury vinyl plank flooring, paint, and new furniture for two main living spaces.I spent $1200 on a drywall crew, $5000 for plumbing (had to dig up slab and replace main), $2700 for new chimney, $500 for a structural engineer and $400 for help from my electrician buddy. 

There is so little supply.

Once you put in furniture , and some area rugs  you dont see much floor anyhow . 

I would take a close look at the market and see what the supply and rent characteristics look like for each type of build.

The cleaner has a key to the cabinet, and there are enough supplies in there to last several months. 

As an incentive I would throw them some appliances and furniture.