It was hot. Really hot. Tennessee, August. Close to 100 degrees, and the air so thick you could cut it with a knife. Sweat ran down our backs before we finished the exterior walk. Our shirts were soaked through. Middle of the turn at a student property. I told the supervisor, “Let’s walk the vacants.” First door. A wall of cold air hit us. For about two seconds, it felt great. Then the owner in me took over. The thermostat read 70. Cool. HOLD. WTF? The painters had been in two or three weeks earlier. They got hot, turned the AC down, and left. Someone checked the unit after them. Just not the thermostat. Or the lights. Weeks of air-conditioning an empty apartment in a Tennessee August. Now multiply that by every unit in turn. I’ve fought this for 30 years. Too many hands touch a vacant unit: painters, cleaners, carpet crews, maintenance, leasing agents. Every one of them can move a thermostat. Unless you walk every unit every week, you have no feedback loop. Some residents never put power in their name or do and have it cut off and put back in your name. If your billing and your property management software don’t talk, the bill-back depends on someone catching it by hand. And the bills run late. They land 30 to 45 days after the usage. By then the money is spent. Does the tech pay? Smart meters can record usage every 15 minutes, and services like Arcadia pull those readings daily. Connected thermostats from SmartRent and others can reset themselves when a unit goes vacant. But you pay for thermostats on every unit and only save on the empty ones. At 95% occupied, 300 units might waste $10,800 a year against $60,000 of hardware. Five-plus years. A lease-up at 50% vacant can pay that back in under a year. A student property with half the building empty each summer gets there in about two summers. Where it’s headed The usual line in the variance report: “We had more vacancies than expected, so vacant electric ran over.” True. And useless. Claude or ChatGPT can run that the day a bill posts. Feed it the bills, move dates, and work orders, and it can rank units by cost per vacant day against who was inside. If the same painter sits near the top every month, you have your answer. But only if your work orders say who was there. The painters stopped billing me when they left. The AC didn’t. I found it with my hand on the doorknob. I’d rather find it on my phone the next morning.