In my estimation (local utility costs vary as well as temperature) it is about $400 per month on average. 

A temperature sensor is placed on the incoming and outgoing hot/cold water lines to determine the BTUs consumed.

We put a thorough description in our welcome letter, our digital guidebook and our hardcopy guidebook, that explains the pool temperature situation.  

Assuming your tenants pay for electricity, boom, they pay for heat, and they can have their apartment at whatever temperature they want.

Currently, the owner pays all utilities.Clearly, it's not ideal to only allow one tenant to control the temperature (which is what the current set up is).

“There are other appropriate ways to bring down indoor temperatures, but a building’s electrical system and cost barriers must be taken into consideration,” wrote Debra Carlton, CAA’s executive vice president.Instead of costly mandates, CAA supports aligning the bill with AB 209, which directs the Department of Housing and Community Development (HCD) to develop practical recommendations for maintaining safe indoor temperatures by 2025.

Cap rate has been a quick way to take the temperature on my ROI of the my funds in the purchase and it's return as an investment, without clouding it with all the other moving parts.At the same time, cash-on-cash interests me less, as mine isn't particularly impressive.

A check-in station is set up outside where staffers take members’ temperatures.

Example with zipcode 11203:  https://www.zillow.com/rental-manager/market-trends/11203/Then if the market temperature on this page says warm or hot, I'll look up a house I might want to buy in that zipcode.

Insulating the side of the foundation as is shown in this drawing (which may not be 100% of what you have, but illustrates the point) is also a temperature control strategy.