They are typically at least $300-500 though.There's also some models of window air conditioners that work in reverse cycle but every one I've seen is at least $400.A 2 ton ductless system is $950 on eBay and will probably work better in heat pump mode at low temperatures.

I'm trying to find out what the "TEMPERature" is like out there right now....

Joshua, Attic fans are simply a fan with a thermostat that cycles it on when the attic temperature reaches a specified temperature.

I put a outdoor wifi camera in a tree facing one of my rental units, I had to install a wifi router in the Attic where the cable comes in hidden out of site. 

There is a minimum temperature the heat must be kept at although I’m not 100% sure what it is in NYC.

However, the temperature is a good 5 or more degrees cooler with less direct sunlight than upstairs. 

If there is no existing ductwork, I might lean towards a ductless heat pump since they are pretty efficient at low temperatures.  

For a residential (4 units or less) landlord policy, those items will vary slightly by company/policy but are typically landlord personal property, carpeting, domestic appliances, awnings, outdoor equipment and antennas, fences, and other structures that are not considered buildings.I mentioned above that ACV and RCV coverage do not affect the policy limit, and here's where the terms get a little more confusing.  

I would suggest to make them put the utilities under their own name (if possible), because even if you put it as included in the rent, unless you charge a good amount, they will abuse it (turn the heater that extra temperature, take those extra 5 minutes in the shower, etc.).

Mine is now cooking for my wife and kids and getting them outdoors.