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No heat in winter: safe heating, pipe protection, and hypothermia defense

Emergency numbers differ by country. This page uses 911, the number for the United States and Canada. Many other countries use 112, 999, or another number. Find the number for your country.

When a furnace, heat pump, or boiler breaks down during severe winter freezing weather, an indoor living space loses thermal energy rapidly. Within hours, indoor temperatures can plunge below freezing, creating life-threatening hypothermia risks for infants, older adults, and individuals with underlying medical conditions, while frozen water pipes risk catastrophic bursting and whole-home flooding.

In their desperation to stay warm, residents frequently resort to improvised heating methods that lead to fatal carbon monoxide poisoning or whole-house fires.

Knowing how to isolate a micro-climate room, deploy supplemental heaters safely, prevent carbon monoxide buildup, protect household plumbing from freezing, and decide when to evacuate to a municipal warming center protects your family and your property.

Do this now: immediate emergency checklist

If your heat fails during freezing winter temperatures:

  1. Create an insulated micro-room immediately: Do not try to heat the entire house. Gather all household members and pets into a single small, interior room with few windows (preferably on the second floor or south-facing side of the house) and shut all doors to unused rooms.
  2. Troubleshoot the furnace basics safely:
    • Check the thermostat: Confirm it is set to Heat, the target temperature is set higher than the room temperature, and the thermostat batteries are fresh.
    • Check the furnace electrical switch: Modern heating systems have an electrical toggle switch (often with a red cover plate) on the wall or side of the unit that resembles an ordinary light switch. Ensure it was not accidentally flipped to Off.
    • Check the circuit breaker panel: Look for a tripped heating system breaker and reset it once.
    • Check the intake and exhaust PVC pipes outside: High-efficiency furnaces vent through plastic pipes penetrating exterior foundation walls. If drifting snow or ice blocks these pipes, the furnace automatically shuts down on an airflow fault. Clear all snow and ice away from exterior vent terminations.
  3. NEVER use open flames or outdoor cooking appliances for indoor heat: Never use a gas oven, open stovetop burners, charcoal barbecue grill, propane camp stove, or unvented fuel generator inside your home. Burning fossil fuels indoors depletes oxygen and produces lethal concentrations of carbon monoxide gas.
  4. Protect plumbing from freezing: Turn faucets to a steady, pencil-lead-thin trickle of cold and warm water. Flowing water prevents ice crystals from forming blockages. Open all kitchen and bathroom cabinet doors beneath sinks to expose supply pipes to warm room air.
  5. Put on moisture-wicking layers and headwear: Wear synthetic or wool thermal base layers under warm fleece, put on wool socks, and wear a knit winter hat indoors. Up to 10 percent of body heat can be lost through an uncovered head.

Creating a survival micro-climate room

A whole house loses heat through exterior walls, attic hatches, and foundation slabs. Concentrating human body heat and thermal mass in one isolated room preserves safe temperatures for days:

1. Room selection criteria

  • Select a small interior room or south-facing bedroom that captures solar heat during daylight hours.
  • Avoid rooms with high vaulted ceilings, large picture windows, or uninsulated exterior doors.
  • If you have an indoor camping tent, pitch the tent inside the chosen room on top of a mattress or thick rugs. The double-wall fabric traps human body heat efficiently, creating a micro-environment that can remain 5 to 10 degrees Celsius (10 to 18 degrees Fahrenheit) warmer than the surrounding room.

2. Sealing drafts and thermal leaks

  • Hang thick wool blankets, heavy quilts, or sleeping bags over windows using nails or tension rods to create thermal barriers against cold window glass.
  • Roll up bath towels or blankets and wedge them firmly along the bottom gap of all interior doors.
  • Close chimney flue dampers tightly if the fireplace is not actively in use to prevent warm room air from being sucked up the chimney.

3. Safe bed warming techniques

  • Sleep with multiple layers of blankets and down comforters. Place blankets beneath your body as well as on top; cold mattresses extract heat from the body through conductive cooling.
  • Fill metal or heavy plastic hot water bottles with warm tap water (if hot water is still functional), wrap them in a towel, and place them at the foot of your sleeping bag before getting in.

Space heater safety rules: avoiding fires and toxic gases

Portable space heaters keep isolated rooms comfortable, but improper usage causes over 1,700 residential structure fires each year:

1. Electric space heaters

  • The three-foot clearance perimeter: Keep all bedding, clothing, curtains, paper, and upholstered furniture at least 1 meter (3 feet) away from the front, sides, and rear of the heater.
  • Direct wall outlet connection: Always plug electric space heaters directly into a heavy-duty wall electrical receptacle. Never use extension cords, power strips, or surge protectors. High-amperage space heaters (typically 1,500 watts) heat up the fine wire strands inside extension cords, causing electrical wall fires.
  • Level floor placement: Place heaters on a flat, hard, non-combustible floor surface. Never set a heater on a thick rug, carpet, table, or bed. Ensure the unit features an automatic tip-over shutoff switch and overheat protection.
  • Never sleep with space heaters running: Turn off electric space heaters when you leave the room or go to sleep.

2. Kerosene and indoor-rated propane heaters

  • Indoor-certified appliances only: Use only portable heaters explicitly certified by testing laboratories (such as UL or CSA) for indoor residential use (such as indoor radiant catalytic propane heaters equipped with an Oxygen Depletion Sensor / ODS).
  • Ventilation requirement: Even indoor-certified fuel heaters consume indoor oxygen and emit trace combustion gases. Crack an exterior window by at least 2.5 centimeters (1 inch) in the room where the heater operates to ensure fresh oxygen exchange.
  • Outdoor refueling only: Never refuel a kerosene or propane heater indoors. Turn off the heater, carry it outdoors, allow it to cool completely for fifteen minutes, and refill fuel away from structures. Adding liquid fuel to a hot heater can ignite rising vapors and cause an explosion.

Carbon monoxide: the silent winter killer

Carbon monoxide (CO) is a colorless, odorless, tasteless, non-irritating toxic gas produced by incomplete combustion of hydrocarbon fuels (gas, oil, wood, kerosene, propane, charcoal):

  • Symptoms of carbon monoxide poisoning: Dull headache, dizziness, nausea, vomiting, shortness of breath, confusion, blurred vision, and sudden loss of consciousness.
  • The flu-like warning sign: If multiple family members and household pets develop identical headache, nausea, and lethargy symptoms simultaneously without a fever, suspect carbon monoxide poisoning immediately.
  • Immediate action: Evacuate everyone from the home into fresh outdoor air instantly and dial 911. Do not stop to open windows or look for the source.
  • Alarm requirements: Maintain working battery-operated or battery-backed digital carbon monoxide alarms on every floor of your home and outside all sleeping areas. Test alarm batteries monthly.

Protecting household plumbing from freezing and bursting

Burst water pipes cause tens of thousands of dollars in water damage when ice thaws:

  • Maintain a continuous water trickle: When indoor temperatures drop below 4 degrees Celsius (40 degrees Fahrenheit), open both the cold and hot water taps on sinks located along outside walls to a steady pencil-lead-thick stream. Flowing water prevents static ice blockages from forming.
  • Circulate warm air under sinks: Keep kitchen and bathroom vanity doors wide open so room air reaches the plumbing traps and supply lines.
  • Insulate exposed supply lines: Wrap exposed copper, PEX, and PVC water pipes in unheated basements, attics, and crawl spaces with foam pipe insulation or thick towels taped in place.
  • Locate your main water shutoff valve: Identify your main water shutoff valve (usually located in the basement, utility closet, or near the water meter) so you can turn it off instantly if a pipe freezes and fractures.

Special protections for high-risk individuals

Hypothermia can develop stealthily in vulnerable populations:

1. Infants and toddlers

  • Infants lose body heat up to four times faster than adults and cannot shiver effectively to produce metabolic heat.
  • Dress infants in warm footed sleepers and a wearable blanket or sleep sack. Never place loose heavy blankets, quilts, or pillows in an infant crib, which creates fatal suffocation hazards.
  • Check their chest or neck for warmth; hands and feet are poor indicators of core body temperature.

2. Older adults and chronic illness

  • Older adults produce less body heat, have thinner skin, and frequently take medications (such as beta-blockers) that impair the body's natural shivering and vasoconstriction reflexes.
  • Older individuals can develop accidental hypothermia in rooms cooled to 15 degrees Celsius (60 degrees Fahrenheit). Monitor for confusion, slurred speech, slow breathing, and cold, pale skin.

When to evacuate to a community warming shelter

Do not risk your life trying to withstand prolonged freezing temperatures in an unheated house:

  • The 48-hour threshold: If indoor temperatures drop below 10 degrees Celsius (50 degrees Fahrenheit) and utility repair crews project prolonged power or gas outages, leave the home.
  • Dial 211 for warming center locations: Call 211 (in the United States and Canada) or contact your local municipal emergency management office to locate active public warming shelters, heated community centers, and pet-friendly evacuation facilities.
  • Pack your go bag: Bring essential medications, medical devices, chargers, identification, warm clothing, and infant supplies.
  • Shut off water before leaving: If evacuating a freezing home, turn off the main water shutoff valve and open all faucets to drain the pipes, preventing water from freezing and bursting pipes while you are away.