Van Life

The mattress is new, and the heater is burning fuel with the window shut. About 20% of a van build is what keeps the night safe, and the other 80% is lights, paneling, and a bed that photographs well. The dangerous part is heat from fuel inside a closed box. A carbon monoxide alarm, and a rule for where that flame is allowed to run, come before another upgrade.

Carbon monoxide does not care about the mattress

Carbon monoxide is a gas you cannot smell. It comes from anything that burns fuel: a portable generator, a propane heater, a camp stove, a charcoal grill. The CDC says never run a generator inside a home or garage, even with the doors open, and to operate it outdoors more than 20 feet from windows, doors, and vents. Use a battery-powered carbon monoxide alarm. Never use a portable gas camp stove indoors (CDC).

A van is a small closed room. "Cracking a window" is not the 20-foot rule. A heater or generator in the cabin, or exhaust pointed at a vent, is how people die in their sleep. Symptoms can look like the flu, or like being tired. You may not wake up to notice them.

From 2012 through 2022, the CPSC counted 872 non-fire carbon monoxide deaths tied to engine-driven tools. Eight percent of those deaths, 68 people, were in RVs and camper trailers, and that slice is portable gear brought in, not every factory-installed RV generator (CPSC, 2012-2022). In the same report, male victims accounted for 80% of the deaths from all of those tools. That 80% is who died. It is not a design ratio for your build.

Heat that does not burn inside the box

Insulation, a real sleeping bag, and a vent fan solve a lot of nights without a flame in the cabin. If you use a combustion heater, it has to be a unit made for that space, vented to the outside, installed as the maker says, with a carbon monoxide alarm that has fresh batteries. A barbecue propane heater from a patio is the wrong object. So is a generator running under the back door "just to charge."

Test the alarm before a trip. If it sounds, get out into open air. Do not open one window and go back to sleep. The ignored majority is shiplap, string lights, and a diesel heater video that never mentions the alarm. Comfort is a mattress you can sleep on. Safety is not dying of a gas you cannot see. Overnight systems that are not a van are on camping. A house alarm is a cousin, not a substitute, on home maintenance.

Power that stays outside the air you breathe

A small solar setup and a battery will run lights and a phone without a tailpipe. If you still carry a generator, start it only outdoors, pointed away from the van, farther than 20 feet from any opening, and never in a carport or under an awning that traps exhaust. Charge, then shut it off. Do not sleep next to it.

Fuel, batteries, and a hot exhaust are also a fire. Keep combustible stuff off the heater. A smoke alarm is a second device, not a replacement for the carbon monoxide one. Water and a way to leave still matter if you are stuck. Those gallons live on prepping.

Sleep and a place to park, after the air is safe

A level bed, a vent, and a parking spot you are allowed to use will decide whether the trip is bearable. They will not decide whether you wake up. Do the alarm and the vent rule first. Then buy the mattress. A pretty wall does not belong ahead of either.

Illustrative: the van had fairy lights and a patio heater. The alarm was still in the box. The window was "cracked." That night matches the CPSC file better than a thin mattress does.

8020 move: this week, mount a carbon monoxide alarm where you sleep and test it. If heat or a generator burns fuel, write where it is allowed to run. No new decor until that card is true.

Misreads that leave the window "cracked"

"Heating is just comfort, like the mattress." Combustion heat in a closed van is a carbon monoxide problem. Insulation and a bag are comfort. A fuel flame needs a vent and an alarm.

"Eight percent means vans are rare, so skip it." Eight percent of those CPSC deaths were already in RVs and campers. Rare is not the same as optional when you sleep in the box.

"The report's 80% means men should worry and others need not." That 80% is the sex of the people who died. The gas does not check. The alarm is for whoever is in the van.

Sources

• CDC, carbon monoxide basics. Generator outdoors, more than 20 feet from openings. Never indoors, even with doors open. Battery carbon monoxide alarm. No portable gas camp stove indoors.
• CPSC, non-fire carbon monoxide deaths from engine-driven tools, 2012-2022. 872 deaths. 8% (68) in RVs and camper trailers, portable gear. 80% of all those deaths were male.
• This is not an install manual for a diesel heater, and it is not a reason to sleep beside a running generator.