Heating Emergency in Winter: What to Do When Your Heat Goes Out
Your furnace was running fine when you went to bed. Now it is two in the morning, the house is cold, and no amount of thermostat adjusting is making a difference. A heating emergency is stressful, especially when the temperature outside is dropping and you have children, elderly family members, or pets depending on a warm home. The good news is that you have time to act safely and methodically. Even on the coldest Los Angeles-area nights, a well-insulated home holds heat for several hours.
At E & A Mechanical, we have been handling emergency heating repair calls across Tujunga, Glendale, Burbank, and the San Fernando Valley for over 25 years. This guide walks you through exactly what to do from the moment you realize your heat is out until a licensed technician arrives to restore your system.
Step One: Rule Out Safety Hazards First
Before you troubleshoot anything, take 60 seconds to check for danger signs. A furnace that has shut down may have done so because a safety device detected a hazardous condition.
Check for the smell of gas. Natural gas is odorless by itself, but your utility adds mercaptan, a chemical that smells like rotten eggs. If you detect that smell anywhere in your home, especially near the furnace:
- Do not flip any light switches or use any electrical devices.
- Do not attempt to relight a pilot light.
- Get everyone, including pets, out of the house immediately.
- Once you are safely outside, call SoCalGas at 1-800-427-2200 and then 911 if the smell is strong.
Check your carbon monoxide detectors. If your CO detector is alarming or shows elevated readings, evacuate immediately and call 911. Carbon monoxide is colorless and odorless, and a malfunctioning furnace with a cracked heat exchanger is one of the most common sources of residential CO exposure. If you do not have CO detectors in your home, we strongly recommend installing them on every level and near every sleeping area.
If there is no gas smell and no CO alarm, you can proceed safely.
Step Two: Quick Checks You Can Do Right Now
Many heating failures have simple causes that you can diagnose without tools. In our experience, roughly one in three middle-of-the-night calls turn out to be one of the following:
- Thermostat. Confirm it is set to "Heat" and the target temperature is set well above the current room temperature. If the display is blank, replace the batteries. If you have a programmable thermostat, check whether an energy-saving schedule has dropped the set point below your comfort level.
- Circuit breaker. Check your electrical panel for a tripped breaker labeled "Furnace" or "HVAC." Flip it fully off and then back on once. If it trips again immediately, leave it off and wait for a technician.
- Furnace power switch. Look for a toggle switch on or near the furnace (often on the wall nearby). It can easily be bumped off by accident.
- Air filter. A completely clogged filter can cause the furnace to overheat and shut down on a safety limit. If the filter is visibly filthy, replace it or remove it temporarily to see if the furnace restarts.
For a more detailed walkthrough of each of these checks, see our full guide on furnace troubleshooting.
If none of these quick checks resolves the issue, the problem is likely mechanical or electrical and requires a professional. Do not attempt to open the furnace cabinet, work on gas connections, or manipulate internal components in the dark at two in the morning. The risk is not worth it.
Step Three: Keep Your Home Warm Safely While You Wait
Once you have called for emergency heating repair, the priority shifts to keeping your household warm until the technician arrives. In the San Fernando Valley, overnight lows typically range from the mid-30s to the low 50s in winter. That is uncomfortable but not life-threatening for most healthy adults, provided you take some basic precautions.
Safe heat sources
- Electric space heaters. The safest portable option. Place them on a flat, hard surface at least three feet from anything flammable. Never leave one unattended or plug it into an extension cord. Use only a wall outlet, and put multiple heaters on different circuits.
- Oven or stovetop? No. Never use your oven or gas stovetop to heat your home. A gas oven produces carbon monoxide in an enclosed space, and electric ovens are a fire hazard when left open.
- Fireplace. If you have a working fireplace, make sure the damper is fully open before lighting a fire. Do not use a fireplace that has not been inspected recently.
Retaining existing heat
- Close off unused rooms. Shut the doors to bedrooms, bathrooms, and other rooms no one is using. This concentrates your remaining heat in a smaller area.
- Gather in one room. Move the family to a single interior room with the fewest exterior walls and windows. Interior rooms hold heat better than corner rooms.
- Block drafts. Roll up towels and push them against the bottom of exterior doors. Close all window coverings.
- Layer up. It sounds obvious, but warm clothing, blankets, and sleeping bags are the safest and most reliable way to stay comfortable. Body heat trapped under blankets is more effective than most people realize.
Protect your pipes
If the outdoor temperature is below freezing and your heat may be out for an extended period, take steps to prevent frozen pipes:
- Open cabinet doors under kitchen and bathroom sinks to let warm air circulate around the pipes.
- Let faucets drip slowly; moving water is less likely to freeze.
- If you have exposed pipes in the garage, attic, or crawl space, wrapping them with towels can provide temporary insulation.
Frozen pipes are uncommon in LA but do happen during cold snaps, particularly in older homes in Tujunga's hillside neighborhoods and parts of Sunland and La Crescenta.
Step Four: What to Have Ready When You Call for Emergency Heating Repair
When you call E & A Mechanical or any HVAC service provider, having the following information ready will help the dispatcher send the right technician with the right parts:
- Your furnace's make, model, and approximate age. Usually on a sticker inside the lower access panel. Do not open the unit if you smell gas or the cabinet is hot.
- What happened. Did the furnace stop suddenly or gradually lose heat? Any unusual noises or a flashing LED code visible through the access window?
- What you have already checked. Let the technician know you have verified the thermostat, breaker, and filter. This saves diagnostic time and gets your heat restored faster.
- Your address and the best phone number to reach you. This sounds obvious but can be forgotten when you are cold and stressed at an unusual hour.
What to Expect from an Emergency HVAC Service Call
Knowing what happens next can ease the anxiety of waiting in a cold house.
Response time. Emergency HVAC calls in the Los Angeles area are prioritized by severity. A complete heating failure during cold weather is typically a same-day or next-morning priority. At E & A Mechanical, we do everything we can to reach emergency calls as quickly as possible.
Diagnosis. The technician will perform a systematic inspection of your furnace: checking power, gas supply, ignition system, flame sensor, safety switches, and control board. Most furnace failures fall into a limited number of categories, and an experienced tech can identify the problem within 15 to 30 minutes.
Repair. Many common failures, such as a failed ignitor, a dirty flame sensor, or a tripped limit switch, can be repaired on the spot. Our trucks carry common replacement parts for major furnace brands. If a part needs to be ordered, the technician will explain the timeline and options for temporary operation.
Cost. Our technicians always explain the diagnosis and provide a repair estimate before beginning work. You will never be surprised by a bill. If the furnace cannot be repaired cost-effectively, we will provide an honest assessment and a free replacement estimate.
How to Prevent Heating Emergencies
The best emergency call is the one you never have to make. A few proactive steps dramatically reduce the risk of a mid-winter breakdown:
- Schedule annual maintenance. A professional heating tune-up before the cold season catches worn ignitors, dirty flame sensors, and failing components before they leave you without heat.
- Replace your filter regularly. Check it monthly and replace it every 60 to 90 days during the heating season.
- Know your system. Familiarize yourself with your furnace's location, the power switch, the circuit breaker, and the gas shutoff valve before you need them in an emergency.
- Install CO detectors. They protect your family and provide early warning of a heat exchanger problem that might otherwise go unnoticed.
Frequently Asked Questions
How cold does it have to get before a heating emergency is dangerous?
For healthy adults, indoor temperatures above 60 degrees Fahrenheit are uncomfortable but not dangerous. For infants, elderly individuals, and people with certain medical conditions, the threshold is higher. If your home drops below 60 degrees and you cannot warm it adequately with safe supplemental heat, consider staying with a friend or family member until repairs are complete.
Can I run my furnace if the heat exchanger is cracked?
No. A cracked heat exchanger can leak carbon monoxide into your living space. If a technician has identified a crack, do not operate the furnace until it is repaired or replaced. This is one situation where replacement is almost always the right decision.
What does emergency HVAC service cost?
Costs vary depending on the time of day, the nature of the repair, and the parts required. Most companies charge a diagnostic or service-call fee plus the cost of repair. At E & A Mechanical, we provide transparent pricing before any work begins. Call us and we will give you a straight answer.
How can I tell if my furnace problem is an emergency or can wait until morning?
If you smell gas, hear unusual banging or screeching sounds, see sparking, or have a CO alarm going off, treat it as an immediate emergency. If the furnace simply will not start and there are no safety hazards, it is reasonable to bundle up for the night and call first thing in the morning for a priority repair.
Does E & A Mechanical offer emergency HVAC service in Tujunga and the San Fernando Valley?
Yes. We serve Tujunga, Glendale, Burbank, La Crescenta, Sunland, Montrose, Pasadena, and the entire San Fernando Valley. Call us at 818-988-9060 for emergency service.
This blog is for informational purposes only. HVAC work involving electrical, gas, or refrigerant systems should always be performed by a licensed professional. Attempting repairs without proper training can void warranties and create safety hazards.
Need HVAC service? Schedule service today or call 818-988-9060 for a free estimate.