You need to check in your due diligence with the state so you understand what sub metering consists of, as every state is different.

Consistency is the only way to make it in real estate.

Is ALL of your other marketing sending a consistent message?

If you put $45k down and pay $500 per month negative cash flow --- you are not going to be too excited about your real estate venture in 6 months...You won't feed any better if your negative cash flow was $300 per month.After doing all kinds of rentals for 50+ years in Northern Calif, I realized long ago that negative cash flow and "crossing my fingers" hoping for appreciation was not good foundation for my planned real estate empire.Well, like you, because cash flow was most important to me an most newbie investors, I had to have a plan.  50 years later, and 250 rental homes, at my high mark, I will tell you what I did and why it worked..I buy groups of homes on a single parcel, usually 5 or more.  

No consistent pattern yet.

I always figured that if a TK provider could deliver what they claimed to offer consistently and over a long period of time... they would either keep them or have huge corporate buyers gobbling up as many properties as they could deliver.

Building consists of two 3bd apartments, one 4bd and one 1bd.

It might be easier for you to just install a fan that feeds out to the exterior of the building and have that wired into the light switch so if the lights are on so is the fan. 

The guy below called 911 when water started coming in his unit and the city fire department came and shut down the water that feeds 9 units. 

I know once I find it & develop consistency the results will follow.