I could get another manager, but that (presumably) would only prolong the process and cost more.I greatly appreciate all responses!

The home does not have separate meters for gas/water/electric and all the ducting is connected to the same furnace and A/C... the thermostat for the air conditioning and heater is in our unit. 

Forced air heat. 

For the rest of the country, you would need a prolonged depression before people picked up and left.

I've dealt with bad tenants and having these tenants is a breath of fresh air.

People have to remember to clean them and put water in them.I’d be concerned that warm moist air is being blown inside the unit.

We're trying to decide on what material to use to replace it.There's not great air flow to inside which is why we're considering moving away from carpet and something that may hold less moisture, easier to clean, look more modern etc.

It looks like the listing mentioned forced air.

I prefer having the air space under the metal, the strapping helps to level out the uneven surface and the metal is more securely held down with strapping.

Now, how an "appraisal" works on a commercial property like this is beyond me, or if they're just having an agent pull a number out of the air and call it an appraisal.