The yearly copper refined production numbers and their trend is the historical predictor, not the price, and not consumption.

I don't know if your utilities are separate, however, extra people living in the apartment creates extra consumption of electric, gas and water.

Restricted air flow across those surfaces increases energy consumption and puts unnecessary stress on the moving parts.However, A/C systems are sealed systems and should not have to topped up or recharged unless there is a leak.

This at least as it relates to building for retail consumption or flipping..    

I'm also aware that average lung capacity is 6 liters your passing oxygen molecules through a latex filter that will take far too long to accommodate a human's rate of oxygen consumption.

I equate some of these mistakes landlords make to a family-owned bar not checking IDs and just freely serving alcohol.

I've been in a similar situation with an alcoholic tenant with kids......long story short she cost me over $3400.00.

NO DRUGS OR ALCOHOL!

HOWEVER, in looking over some of the reviews of the more efficient washers, I learned that tankless HWH and low consumption washers are not compatible because they fill the washer in short pulses or "spurts" and tankless HWH requires a consistent flow rate demand to fire it up. 

.- at some properties we set a cap on the monthly utility consumption and levy a surcharge if the tenants collectively exceed that amount.At our main student rooming house we have a live-in Den Mother which goes a long ways to maintaining peaceful operations with the above basic ruleset.