Every shop with an on-call rotation has some version of the night sheet. Sometimes it's a laminated page taped next to the phone. Sometimes it lives in the owner's head, which is the worst place for it. Either way, it's the rules that decide whether a no-heat call at 1 a.m. wakes your on-call tech or gets an 8 a.m. slot.
If you use an HVAC answering service, or you're shopping for an after-hours answering service, this sheet is the whole job. Whoever picks up at night doesn't know your customers or your trucks. Only what you wrote down. So here it is, the way I'd walk a new dispatcher through it across the desk.
Two kinds of calls skip the sheet
Before temperature, before who's home, before anything else: gas and carbon monoxide.
If the caller smells gas, or a CO alarm is going off, nobody troubleshoots and nobody books anything first. The first thing out of our mouth is: get everyone out of the house, don't flip light switches or start anything that could spark, and call 911 or the gas utility's emergency line once you're outside.
That order isn't ours, by the way. New York City tells people the same thing on its heat and hot water page (open a window, get outside, call 911), and the fire safety people at NFPA say about the same for a CO alarm. Fresh air first. Phone call from the yard.
Why so strict? CO has no smell and no color. It comes from fuel that doesn't burn all the way (gas, propane, oil, a lot of what we service), and the EPA lists leaking furnaces and back-drafting gas water heaters among the usual household sources. Symptoms? Headache, dizziness, nausea, a "flu" that clears up once they leave the house. Family with headaches ever since the furnace started acting up? Not a morning slot.
Once the family's out on the lawn, does your on-call guy get a call tonight? Put the answer on paper. Me, I'd say yes every time, because the next call is so often "they shut my furnace off, now I have no heat." And nobody on the phone ever talks a homeowner through relighting anything.
The thermometer question
Most no-heat calls are not emergencies. Uncomfortable, sure. Dangerous, not yet. Cold snap, though, and they all sound like one. Ten calls in an hour, everybody upset. The question that sorts out the real emergency HVAC calls is a boring one: what does the thermostat say it is inside, right now?
Get a number. "It's freezing in here" is not a number. Send them to the thermostat. Get the setpoint too, while they're standing there.
Say the lady on Elm reads you 55 in the den. Fine. Now hold that up against a number you picked back in daylight, when nobody was yelling. Your housing code can lend you a floor. New York City requires landlords during heat season (October 1 through May 31) to keep the inside at 62 degrees or warmer from 10 p.m. to 6 a.m. no matter the weather, and at 68 during the day when it's below 55 outside (NYC HPD). (A landlord rule for one city, not a dispatch standard, and yours may differ.)
The indoor number alone won't settle it, though. A house at 60 degrees at midnight with 45 outside will probably be livable at 8 a.m. Same house, 5 outside and falling, and now you're thinking about frozen pipes, not just comfort. The sheet line reads something like "inside below X, or outside below Y overnight: roll the truck." You fill in X and Y. Nobody makes them up at 2 a.m. Partial heat (backup strips, one zone of three, a boiler that can't keep up) usually waits too, unless something below bumps it.
Who's in the house
Fifty-eight degrees with two college roommates in the house? Morning. Fifty-eight with a newborn down the hall is another story.
So you ask. Every call, same words, even when the caller sounds young and fine: anybody in the house who's elderly, a baby, or sick in a way that makes the cold risky? People almost never volunteer it. That NYC page notes infants, seniors and people with paralysis or neuropathy are at higher risk of hypothermia.
Don't dig for medical details. A yes bumps the call up a level. On my sheet, a yes plus a low indoor reading means you wake the tech.
Summer flips the equipment, not the logic. A no-cool call from a healthy couple is a morning call nearly every time. A guy calling about his mom, 84, house already sitting in the high 80s at ten at night? Different call. Same bump.
Water on the floor
Water keeps doing damage while everybody sleeps. Two questions: where's it coming from, and is it still coming?
Condensate pan spilling over under the air handler? Usually a morning job, once they kill the system at the thermostat and throw some towels down. Water from a boiler or hydronic piping, or anything that won't stop, gets escalated. Hours without heat in a hard freeze? Ask about burst pipes. The first truck out might need to be a plumber's.
Members and commercial accounts
If your agreement promises members priority, the sheet has to say what that means after hours. Maybe a member at 61 degrees gets a truck tonight when a non-member wouldn't. Maybe it's first slot in the morning and no after-hours fee. Dispatch delivers what the agreement says, nothing extra.
Commercial is the same, except it's usually in writing. Think restaurant, no heat, full Saturday tomorrow. If an account pays for a guaranteed response time, there's no judgment call left: you roll, or you call the owner.
What to write down on every call
Worth copying, whoever answers your phones:
Name, callback number, service address (gate code, unit, where to park)
System type: gas furnace, heat pump, boiler, AC
What it's doing: dead, blowing cold, running but losing ground, blinking light
Indoor temperature from the thermostat, and what it's set to
Anyone home who's elderly, a baby, or medically vulnerable
Any gas smell, CO alarm, burning smell, or water
Member, commercial account, or new customer
What they've already tried
Whether they heard and agreed to your after-hours rate, if you charge one
That last line saves a lot of 7 a.m. arguments.
On "what they've tried," a couple of phone checks are fine. Fresh thermostat batteries. Thermostat actually set to heat. The switch by the furnace that looks like a plain light switch. Panels, gas valves, anything that needs a screwdriver? No. Not at night, not over the phone.
The calls that wait
This is where most of the night lands. Give them a real time ("someone will call you" doesn't count), and tell them to call back if it drops faster than you both figured or somebody starts feeling off. If space heaters come up, the NYC page has the basics (straight into the wall, no extension cord, keep it off the curtains).
Then the clipboard goes on the morning desk with those calls on top. A waited call nobody touches until noon turns into a one-star review.
Running the night sheet at 1 a.m. with an AI receptionist
Picking up was never the hard part of nights. The hard part is call number twenty in a cold snap, caller upset, you half asleep, still asking the same questions in the same order.
That's where an AI receptionist is actually good. Three a.m., it still asks for the thermostat reading. Still asks who's in the house. Put "get out, call 911 or the gas company from outside" at the top of your gas rule and that's what callers hear first, word for word. The ones that can wait end up as real morning slots on your calendar (not a blinking voicemail light).
But it only follows what you write. There's a line in AptaBook's guide to setting up an inbound voice agent I'd tape to the wall: "Just be smart" is not a rule. And no, it doesn't diagnose anything. Symptoms go in the notes, the visit goes on the calendar, and the diagnosis waits for your tech.
A person should take over in a few places. Gas and CO calls, right after the safety script. Callers who sound confused or very distressed, or say someone already feels sick. Commercial contract fights. Repeat callers whose last repair didn't hold. And anything the sheet doesn't cover. A call that fits no rule should reach a human, not a guess.
The handoff only works if somebody answers. Transfer goes to the on-call phone, phone's on the nightstand on silent, caller gets nothing. Not the software's fault. Still your problem. So test that leg too: call your own line from your cell after hours, play the no-heat caller with grandma in the back bedroom, see whose phone actually rings.
Check the night every morning
Whoever opens up reads the overnight summaries first thing, looking for two mistakes: trucks that rolled when the call could have waited, and calls that waited when they shouldn't have. Either one is a line on the sheet to fix.
Skip the industry benchmarks for how many night calls "should" become truck rolls. Your own records know. A month of after-hours dispatches, what each one cost in on-call pay or overtime, how many ended with the tech flipping a breaker or swapping a thermostat battery.
Putting your sheet on the phone
Want to try your sheet on a live line? AptaBook is an AI receptionist, and not only for the phone. It picks up calls around the clock, plus web chat, WhatsApp and email. It asks the intake questions you give it, and the jobs that can wait go onto Google Calendar or Outlook.
When your rules say a person has to step in, it hands off. Transfer, callback, or an email to your team.
Plans run $49, $99 or $149 a month. There's a 15-day free trial, no card. The AI receptionist for home services page has the details, or book a demo, bring your night sheet, and throw your worst 1 a.m. calls at it.