After-Hours HVAC Text-Back: No-Heat Triage Without Promising Miracles

The worst HVAC missed call is the one at 9:40 PM in January from a family with no heat. They’ll call every company on the first page of results until someone picks up. A good after-hours text-back won’t fix the furnace, but it can keep that caller from moving on, and it can do it honestly.

This page covers only the after-hours part. For the basic setup, see the missed-call text-back playbook.

Why after-hours is different

During the day, a missed-call text can say “we’ll call you back within the hour.” At night, that’s usually not true, and a broken promise at 10 PM is worse than none. After-hours calls also mix true emergencies (no heat in a cold snap, no cooling for an elderly customer in a heat wave) with things that can wait (a noisy unit, a maintenance question, a quote).

So the after-hours text has three jobs: be honest about when someone will respond, sort the urgent from the routine, and send dangerous situations somewhere safe.

Step 1: Decide what after-hours service you actually offer

Write this down before you write any text:

Do you have an on-call tech? Which nights?
Do they answer texts, or only calls from the office?
What counts as an emergency for you? (No heat below a certain outdoor temperature? No cooling with a medically vulnerable person? Water leaking from the air handler?)
Is there an after-hours rate, and who confirms it?

The text can only promise what this list says. If nobody’s on call, the text says the morning callback time. That’s it.

Step 2: Split business-hours and after-hours replies

Most phone systems and FSM tools let you set a schedule for auto-replies. Set one message for open hours and a separate one for after hours, weekends, and holidays. Test the switch times. A common mistake is a holiday weekend where the “we’ll call you in 15 minutes” message runs for three days.

Step 3: Write the winter no-heat text

Use this from roughly first frost to spring:

Hi, this is [Company] Heating & Air. We’re closed right now, but we got your call. Is your heat out completely, or is it running but not keeping up? Reply HEAT OUT or OTHER. We’ll text back starting at [7:30 AM]. If you smell gas, leave the house and call your gas company or 911 first.

The two-way question matters. “Heat out completely” in a cold snap goes to the top of the morning list or to the on-call tech. “Running but not keeping up” can usually wait for a scheduled visit.

Step 4: Write the summer no-cool text

Switch to this when cooling season starts:

Hi, this is [Company] Heating & Air. We’re closed now, but we got your call. Is your AC not running at all, or running but not cooling? Reply NO AC or OTHER. We’ll text back starting at [7:30 AM]. If someone in the home is having trouble with the heat, call 911.

Heat waves are a health risk, especially for older adults. The line about calling 911 isn’t drama. It makes sure the text never stands between a sick person and help.

Step 5: Add an URGENT path only if it’s monitored

If you have an on-call tech who will actually answer, add one line:

If this can’t wait until morning, reply URGENT and our on-call tech will call you.

Then route URGENT replies to that tech’s phone, not to an office inbox nobody checks at night. Test it monthly. If the on-call rotation lapses, take the URGENT line out the same day.

What the text should never do:

Invent an ETA. “A tech will be there within 2 hours” is a promise you can’t keep from a template.
Promise a price unless the after-hours rate is fixed and current.
Diagnose. No “sounds like your igniter.”

Step 6: Add a safety line for gas and carbon monoxide

Every after-hours heating text should include a short gas and CO line, near the top or in plain view. People with a CO alarm going off sometimes call the HVAC company first. The EPA’s CO guidance is clear that the first step is getting to fresh air. Your text should send them to 911 or the gas utility, not ask them to wait for a callback.

Step 7: Work the overnight queue every morning

The morning matters as much as the text. Give one person the job of working overnight replies before the phones get busy:

HEAT OUT / NO AC replies first, in time order.
URGENT replies the on-call tech didn’t close.
OTHER replies, booked into regular slots.

Track how many overnight replies you got, how many booked, and the time from the first morning text to the booking. If overnight replies aren’t booking, the morning callback is usually too slow.

Common mistakes

One message 24/7, so the night caller gets a “15 minutes” promise.
URGENT routed to an unmonitored inbox.
No seasonal switch, so July callers get asked about their furnace.
A safety line buried at the bottom of a long message.
Registration skipped. Business texts from an unregistered 10-digit number can get filtered. Register (A2P 10DLC) through your provider, keep these texts about the inquiry, and honor STOP.

Next steps

Write the winter and summer versions now, set your schedule, and text your own business line after hours to test. The HVAC trade page has the HVAC script pack, or join the free weekly playbook and get the pack free.

Free script pack + weekly playbook

Get the After-Hours Text-Back Script Pack free: 12 after-hours texts for your trade, plus the 60-Second Phone Setup Card and the Missed-Call Math Sheet. You'll also get one AI build for your shop every Tuesday.

Ready to paste into Jobber, Housecall Pro, ServiceTitan, or your phone system
Written to respect texting opt-out rules
Free. Unsubscribe in one click.

Plus a per-trade issue every Tuesday: one AI play, under 5 minutes to read.

FAQ

Should the after-hours text quote an emergency fee?

Only if your fee is fixed and you're sure it's current. Many shops say there is an after-hours rate and that the on-call tech will confirm it on the phone before dispatching. Never let the text promise a price or an arrival time.

What if we don't run nights at all?

Say so plainly: we're closed, we'll text you back at 7:30 AM, and here's the first slot we usually have. An honest morning callback still beats voicemail, and the caller can decide whether to wait.

Can the text tell people how to reset their system?

Simple checks like confirming the thermostat is set to heat and has batteries are low risk if you keep them to one line. Avoid anything involving breakers, panels, gas valves, or opening equipment. Leave diagnosis to a technician.

How do we stop the URGENT option from being abused?

Let the on-call tech call back and sort it. If someone replies URGENT about a dirty filter, the tech books them for the morning. The point is that real no-heat calls get a human fast.

Sources

Checked 2026-10-15. Vendor pricing and terms change, so confirm on the vendor's page before you buy.

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