No-heat calls at night: triage questions and safety

Why no-heat calls need a script

A no-heat call at night combines everything that makes calls hard: a cold, worried caller, a CSR or answering service without a technician's training, and a heating system that may burn gas. Without a script, the call either sends a tech out for a thermostat set to "cool," or misses the one detail that matters: a carbon monoxide alarm chirping in the hallway.

Heating is the largest energy use in most homes; space heating and air conditioning together accounted for 52% of household energy consumption in 2020^[3]. When it stops, people notice fast. The script below puts safety first, then vulnerability, then a few checks any caller can do, then the dispatch decision.

Start with safety

The first questions on every no-heat call:

• "Is a carbon monoxide alarm sounding or chirping anywhere in the home?"
• "Do you smell gas, or anything like rotten eggs?"
• "Does anyone have a headache, dizziness, weakness, nausea, chest pain or confusion?"

If the answer to any is yes, stop the troubleshooting. CPSC advises moving outside to fresh air immediately, calling emergency services, the fire department or 911, not going back inside until responders say it is safe, and not trying to find the source of the CO yourself^[1]. The CDC lists headache, dizziness, weakness, upset stomach, vomiting, chest pain and confusion as the most common symptoms of CO poisoning^[4]. For a gas smell, the caller should leave and call the gas utility or 911 from outside. Then alert the on-call tech. Our carbon monoxide call protocol has the full wording.

Who is at home, and how cold is it?

Once safety is cleared, two questions shape the decision:

• "Who is in the home tonight? Anyone very young, older, unwell or with a medical condition?"
• "How cold is it inside right now, and what's the forecast tonight?"

An infant, an older adult or someone with a medical condition in a cold house is an emergency. A healthy adult on a mild night with the house at a comfortable temperature can usually wait for the first morning slot. Freezing weather raises the stakes for everyone because of pipe damage, as below.

The caller-safe checks

1. 01

   Thermostat

   "Is the thermostat set to heat, and set a few degrees above the room temperature? Is the screen on? If it uses batteries, are they fresh?" Many no-heat calls end here.

2. 02

   Breaker

   "In the electrical panel, is the breaker for the furnace or air handler tripped?" A furnace needs electricity even if it burns gas. Reset once only; if it trips again, stop and leave it off.

3. 03

   Service switch

   "Near the furnace there's usually a switch that looks like a light switch. Is it on?" People often switch it off by mistake.

4. 04

   Filter

   "When was the filter last changed? Can you slide it out and look at it?" A very clogged filter can make some systems shut down on a safety limit. If it is badly clogged and a spare of the right size is on hand, the caller can swap it; otherwise note it for the technician.

5. 05

   Vents and registers

   "Are the supply vents open and not covered by furniture or rugs?"

6. 06

   Outside vent pipes

   For high-efficiency furnaces with plastic pipes through an outside wall: "Is snow or ice blocking the pipes outside?" Ask the caller to report it, not to use tools on the pipes.

Heat pump calls

Not every no-heat call involves a furnace. Heat pump owners sometimes call about behavior that is normal, and sometimes about a real failure. A few questions help tell them apart.

• "Is the outdoor unit covered in thick ice, or just frosty?" Light frost is normal in cold weather, and units go through defrost cycles that can briefly release steam and blow cooler air. A unit encased in ice for hours needs a technician.
• "What does the thermostat show: heat, auxiliary heat or emergency heat?" Auxiliary or backup heat coming on in very cold weather is normal; a thermostat stuck in the wrong mode is a quick fix.
• "Is the indoor unit blowing any air at all?" No airflow points to power, the breaker or the blower, and the same breaker rule applies: reset once only.

If the house is holding temperature on backup heat, a morning visit is usually fine. If there is no heat of any kind and it is freezing outside, use the same decision table as for furnaces.

What callers must not do

• Open the burner compartment or remove panels on the furnace or boiler.
• Relight a pilot or reset gas controls, especially if there is any gas smell.
• Use the oven, stove, a grill or a generator to heat the home, or run a generator in a garage or near windows.
• Use unvented fuel-burning heaters indoors.
• Reset a breaker more than once.

Say these out loud on the call. A cold, frustrated caller may try anything once the call ends.

Keeping warm until the tech arrives

If the visit is the first morning slot, help the caller get through the night safely:

• Gather everyone into one or two rooms and close doors to keep heat in.
• Dress in layers and use extra blankets, especially for infants and older adults.
• If using an electric space heater, follow its instructions, keep it well clear of bedding and curtains, and plug it directly into a wall outlet.
• Make sure a working CO alarm is near sleeping areas. The CDC advises battery-operated or battery back-up CO detectors near every sleeping area^[4].
• Call back immediately if anyone feels unwell or the situation changes.

Frozen pipes

In freezing weather, no heat becomes a property risk too. Insurance data shows water damage and freezing affected 1.6% of insured homes per year on average from 2018 to 2022, the second-largest claim cause after wind and hail^[5]. Suggest opening cabinet doors under sinks on outside walls, letting a faucet drip on the coldest nights and knowing where the main water shutoff is. If temperatures are well below freezing and the home has no heat at all, that alone can justify a night visit.

Night visit or first morning slot

Explain the cost before dispatch, as in our guide to pricing after-hours service.

Gas homes and carbon monoxide

Natural gas was used in 58% of US homes in 2020^[2].

Gas and oil furnaces are among the sources of carbon monoxide, and more than 400 Americans die each year from unintentional CO poisoning not linked to fires, with more than 14,000 hospitalized^[4]. A furnace that is struggling or short-cycling is not automatically a CO risk, but the safety questions at the start of the script exist because sometimes it is.

The script, in order

1. Greet, name the company, and get the address and callback number.
2. Ask the three safety questions. If any yes, give the safety instruction and alert the on-call tech.
3. Ask who is home and how cold it is.
4. Walk through the thermostat, breaker, service switch, filter, vents and outside pipes.
5. Tell the caller what not to do.
6. Decide: dispatch tonight or first morning slot, using your triage guide.
7. State any after-hours fee before dispatching.
8. Give warmth and pipe advice if waiting, and confirm by text.

Example: the switch by the stairs

Example: at 10:40 pm, a fictional HVAC company's answering service takes a call from a homeowner with a toddler whose furnace stopped. No CO alarm, no gas smell, nobody unwell. The house is cool but not cold. At the furnace, the caller finds the service switch at the bottom of the basement stairs turned off; a child had flipped it. The heat comes back on. The handler logs the call as resolved by phone, texts a summary and offers a daytime check, and the on-call tech sleeps.

After the call

• Log the safety answers, checks done and the decision.
• Text the caller a summary with the window, the fee if any and the safety reminders.
• If the problem involved a breaker or electrical smell, route it with your electrical emergency triage rules too.
• Remind callers that the CDC advises having heating systems serviced every year^[4], and offer a maintenance visit. Customers interested in a broader safety check may also value an electrical safety inspection.