Winter Survival: Staying Warm Without Utilities

The February 2021 Texas grid failure killed hundreds of people in a state that rarely sees serious cold. People died of hypothermia inside their own homes. They died from carbon monoxide poisoning from improper heating sources. They died from falls on icy roads trying to find warmth elsewhere.

None of these deaths were inevitable. All of them resulted from the same two failures: no plan for heat loss, and no knowledge of what’s dangerous when the heat goes out.

This guide is the plan. Read it before January.

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The Physics of Heat Loss

Your home loses heat through:

• Conduction: Heat moving through solid materials (walls, windows, roof)
• Convection: Warm air escaping, cold air infiltrating through gaps
• Radiation: Heat radiating from warm surfaces to cold ones

Most home insulation addresses conduction. Most heat loss during power outages happens through convection — drafts, door seals, window gaps — and through radiation to large cold surfaces like single-pane windows and uninsulated walls.

What this means practically:

A well-insulated modern home in 15°F weather loses interior temperature at roughly 1–2°F per hour without heating. A poorly insulated older home loses it faster — potentially 3–4°F per hour. After 24 hours without heat in serious cold, interior temperatures can be dangerously low.

The good news: you can dramatically slow this process.

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Thermal Retreat: The Most Important Tactic

Heating your entire house without utilities is inefficient and often impossible. Heating one room is practical.

Choose your thermal retreat room:

• Smallest room in the house (less volume to heat)
• Lowest level (heat rises; basement rooms retain heat better)
• Interior rooms (fewer exterior walls = less heat loss)
• Away from the north and west sides (most exposed to wind in most climates)

A small interior room — a bathroom, a walk-in closet expanded with air mattresses, or a bedroom — can be maintained at survivable temperatures with minimal heat input compared to the entire house.

Prep the room:

1. Block the gap under the door with rolled towels or a draft stopper
2. Cover windows with heavy blankets, moving blankets, or taped-up foam insulation board
3. Cover any vents leading to unheated parts of the house
4. Bring sleeping bags, all blankets, and cold-weather gear into the room
5. Bring water, food, and a bucket with lid (sanitation)

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Heating Options Without Utilities

Option 1: Propane Heater (Best All-Around)

A Mr. Heater Buddy-series propane heater is specifically designed for indoor use and is the most recommended portable heating solution for power outages. It runs on standard 1-lb propane cylinders (or a 20-lb tank with an adapter hose) and heats up to 225 sq ft of space effectively.

Safety: Mr. Heater Buddy units have an oxygen depletion sensor (ODS) that automatically shuts off the unit if oxygen levels drop — a critical safety feature for indoor use. Run with a window cracked 1 inch for ventilation even with this feature.

Fuel math: A 20-lb propane tank at 9,000 BTU (high) setting runs approximately 40 hours. At 4,000 BTU (low) setting, approximately 100 hours. For a 72-hour outage running the heater 12 hours/day at medium output, one 20-lb tank is sufficient with reserve.

Store propane tanks outdoors — in a garage, shed, or on a covered porch. Never store propane indoors.

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Option 2: Wood Stove or Fireplace (Best Long-Term)

An existing wood stove or fireplace is a significant preparedness asset. It requires no purchased fuel beyond what you’ve stored, produces meaningful heat output, and cannot be “run out of” if you have access to firewood.

If you have a wood stove:

• Have it professionally inspected and cleaned annually (creosote buildup is a fire hazard)
• Stock 1–2 cords of seasoned hardwood minimum for a serious winter
• Have a backup ignition method beyond a lighter — fire starters, waterproof matches
• Know how to operate the damper correctly (incorrect damper use causes smoke backup into the home)

If you have a traditional fireplace (not a woodstove insert): Open fireplaces are actually relatively poor heaters — they lose most heat up the chimney and can draw in cold outside air. They are better than nothing but much worse than a woodstove insert, which dramatically improves combustion efficiency and heat transfer.

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Option 3: Kerosene Heater (Effective, Requires Caution)

Kerosene heaters produce high BTU output (10,000–23,000 BTU) and burn kerosene stored in sealed containers that keep for years with stabilizer. They’re widely used globally for supplemental heat.

Safety requirements: Kerosene heaters are not designed for sealed indoor use. They must be used with ventilation — a cracked window is the minimum. Carbon monoxide production is a real risk. Use a CO detector in any room with a kerosene heater.

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What NOT to Use Indoors

These items kill people every winter during power outages:

• Gas ranges/ovens as heat sources: Not designed for heating, produce CO rapidly
• Charcoal grills indoors: Produces lethal CO concentrations within minutes
• Propane camp stoves indoors: Even one-burner camp stoves without ODS sensors produce dangerous CO
• Generators indoors or in attached garages: Generator exhaust is lethal; CO infiltrates the home through garage walls

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Insulating Your Space

Heat sources are only half the equation. Keeping generated heat inside is equally important.

Window Treatment

Windows are the largest source of radiant heat loss in most homes. Single-pane windows lose heat dramatically faster than walls. During a cold-weather emergency:

1. Heavy curtains: Keep them closed on all non-south-facing windows
2. Blankets over windows: Pinned, taped, or draped over curtain rods
3. Foam insulation board: Cut to window size and placed in the frame — R-value of 5–6, compared to R-1 for single-pane glass
4. Bubble wrap: Applied with water directly to window glass, surprisingly effective at reducing radiant loss

For south-facing windows during daylight hours: open the curtains. Passive solar gain through south-facing glass is real and meaningful — let the sun heat the room.

Door and Gap Sealing

Feel for drafts along door frames, window edges, electrical outlets on exterior walls, and pipe penetrations through walls. Seal with:

• Rolled towels at door bottoms
• Painter’s tape over outlet covers on exterior walls
• Foam rope caulk stuffed into gaps (removable, no damage to walls)

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Sleeping Warm: The Critical Period

Body temperature drops during sleep and cannot be consciously managed. Cold sleeping conditions that seem tolerable while awake can be dangerous during sleep, particularly for children, elderly, and those with cardiovascular conditions.

Sleeping Bag Ratings

Cold weather sleeping bags are rated by temperature — but the rating (EN/ISO 13537 standard) represents the temperature at which a “standard” adult male won’t freeze to death, not the temperature at which they’ll sleep comfortably. For comfortable sleep, add 10–15°F to the rating.

A bag rated to 0°F is comfortable for most adults at approximately 10–15°F ambient.

Layering for sleep:

• Wear base layer thermals to bed
• Wool or fleece mid layer
• Sleeping bag rated for conditions
• Second sleeping bag over the first if extremely cold
• Wool hat — significant heat is lost through the head even inside a sleeping bag
• Sleep with others when possible — shared body heat is measurable

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Water: The Cold-Weather Problem

Water pipes freeze when interior temperatures drop below 32°F. Frozen pipes burst. Burst pipes cause flooding damage that compounds an already bad situation.

Prevention:

• Keep interior temperature above 55°F if possible — the pipes in exterior walls need this minimum
• Open cabinet doors under sinks on exterior walls to let heat reach pipes
• Let faucets drip if temperatures are borderline — moving water resists freezing
• Disconnect garden hoses from exterior spigots

If pipes freeze:

• Turn off the main water supply immediately
• Thaw with a hair dryer, heat lamp, or warm water poured over insulation — not an open flame
• Never use an open torch on household pipes

Stored water as backup: Keep your stored water supply where it won’t freeze — inside the thermal retreat room. Water frozen in a container is not drinkable without a heat source to thaw it.

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The Winter Emergency Checklist

Get these before winter, not during it:

• Propane heater (Mr. Heater Buddy or equivalent) with 2× 20-lb tanks
• CO detector for every room used during outage
• Sleeping bags rated to 0°F for each family member
• Heavy wool blankets (2 per person minimum)
• Hand warmers (disposable, 40-hour) — 20+ packets
• Thermal base layers for each family member
• 72-hour water supply stored in the thermal retreat room
• 72-hour food supply (no-cook items — cold beans are unpleasant; granola bars are not)
• Flashlights/headlamps with spare batteries
• Paper books, card games — screens die and boredom degrades morale

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The Bottom Line

Winter power outages kill people who weren’t prepared, and they kill people who were doing the right idea the wrong way (improper indoor combustion). The two rules that prevent both:

1. Have a proper indoor-rated heat source with adequate fuel before winter
2. Have a carbon monoxide detector in every room where you use it

Everything else — insulation, sleeping bags, water management — makes a difficult situation more tolerable. Those two items keep it from being fatal.

Get ready before January. The hardware stores sell out of propane heaters and CO detectors during winter storms, which is precisely when the shelves should be irrelevant to you.