If his high usage is during the summer you probably need better air vents in your roof.  

One of my bigger investor clients owns around 20 air BNBs.

Air Quality: Air pollution from vehicle emissions can be a concern, potentially impacting health, especially for those with respiratory issues.

I change the filter (custom merv 5) every month, tenant says unless it's set to low 60s can't sleep well, air is stuffy. 

Have you checked out Air BnB to see if a vacation rentals are good investments?

I retired from the Air Force in February after 30 years and 27 days of service.

I was wanting to buy in Maine, but I heard about Rutland's clean air and cheap houses.

Considering that they can foreclose even before probate is opened,  this puts the airs in more urgency to sell before the foreclosure. 

For 6 units I figure 150 amps per apartment and 300 amps for the common areas, central air units, washers and dryers, and the like.With the push for all electric living, don't be surprised to see simple apartments at 200 amps and common areas at 400 - 500 amps (electric water heaters and dryers being big draws).

I believe you will be disappointed with the sustaining maintenance/cap ex cost.I think if you pulled your number out of the air, you estimate is closer than most.good luck