Hypothermia is a genuine risk for UK van lifers, especially from October through March. Sleeping in a van at 2°C with inadequate heating, getting caught in a winter rain shower while hiking, or a broken diesel heater on a freezing night all put you in territory where hypothermia becomes possible.
This guide covers how to recognise hypothermia, what to do if you or someone else has it, and how to prevent it when living in a van through a British winter.
What Hypothermia Is
Hypothermia is when your body loses heat faster than it can produce it, causing your core temperature to drop below 35°C. Normal body temperature is 37°C. At 35°C, your body starts to shut down non-essential functions to preserve heat for vital organs.
It is not only about extreme cold. Hypothermia can occur at temperatures as high as 10°C if you are wet, windy conditions, or exhausted. UK van lifers are at particular risk because:
- Vans cool rapidly at night, condensation is high, and heating may fail
- Outdoor activities in the UK often involve wet conditions (rain, sea spray, river crossings)
- The combination of damp clothing + wind + tiredness after a long drive or hike accelerates heat loss
- Alcohol consumption reduces awareness of cold and impairs thermoregulation
Stages of Hypothermia
Mild Hypothermia (32–35°C core temperature)
The person is still conscious and able to help themselves if they recognise the signs:
- Uncontrollable shivering (the body's main heat-generating mechanism)
- Cold, pale skin
- Clumsiness and poor coordination (fumbling with zips, keys, or phone)
- Mild confusion or disorientation
- Slurred speech
- Feeling unusually tired or apathetic
- Goosebumps, raised hair (ineffective in humans but a sign the body is trying)
Shivering is the most reliable early sign. If someone is shivering uncontrollably in a cold environment, treat for hypothermia immediately.
Moderate Hypothermia (28–32°C core temperature)
The person needs assistance and may not recognise their own condition:
- Shivering stops (this is a worsening sign — the body has run out of energy to shiver)
- Confusion becomes more pronounced — may not know where they are, may act irrationally
- Drowsiness and difficulty staying awake
- Slow, shallow breathing
- Slow, weak pulse
- Dilated pupils
- Loss of fine motor control — cannot hold a cup or phone
The cessation of shivering is often misinterpreted as improvement. It is not. It indicates the body has exhausted its heat-generating capacity.
Severe Hypothermia (below 28°C core temperature)
Medical emergency. The person may appear unconscious or dead:
- Unconsciousness
- No apparent pulse or breathing (pulse may be very weak and slow — check for 60 seconds before concluding absent)
- Rigid muscles
- Skin is cold and appears blue or grey
- Pupils may be fixed and dilated
People with severe hypothermia have survived after prolonged resuscitation because the cold protects the brain — do not assume death. "They are not dead until they are warm and dead."
First Aid for Hypothermia
Mild Hypothermia
The goal is to stop further heat loss and allow the body to rewarm itself.
- Get them out of the cold. Into the van, a campsite toilet block, or a sheltered spot out of the wind.
- Remove wet clothing. Replace with dry layers — fleece, wool, dry base-layer. Focus on the torso first. A wet base layer is worse than being naked.
- Wrap in a sleeping bag if available. A survival bag (thin Mylar) alone is not enough — it reflects heat but provides no insulation. Use a thick down or synthetic sleeping bag rated for at least -5°C.
- Give warm drinks. Not alcohol, not caffeine — hot sweet tea, hot chocolate, warm juice. The sugar provides energy for shivering.
- Give high-energy food. Chocolate, nuts, biscuits — anything calorific that the body can burn to generate heat.
- Apply external heat to the torso only. Hot water bottle wrapped in a towel, chemical hand warmers, or body heat from another person (skin-to-skin contact inside a sleeping bag). Do not apply heat to arms and legs — this forces cold blood back to the heart and can cause cardiac arrest.
Do not rub or massage the skin. This does not help rewarming and can cause tissue damage in cold-injured skin.
Moderate Hypothermia
Same as mild, plus:
- Handle the person gently. Rough movement can trigger cardiac arrest.
- Do not give them anything to eat or drink if their consciousness is reduced — they may choke.
- Do not put them in a hot shower or bath. Rapid rewarming of the skin causes peripheral vasodilation, which drops core blood pressure and can cause cardiac arrest.
- Use active rewarming: hot water bottles at the armpits, groin, and neck (insulated from direct skin contact). Heat packs on the chest.
- Call 999 or 112 (emergency services in the UK) if their condition does not improve within 20 minutes of starting rewarming.
Severe Hypothermia
This is a life-threatening emergency:
- Call 999 immediately. Tell the dispatcher that the person has severe hypothermia.
- Check for pulse and breathing for 60 seconds. The heartbeat may be as slow as 2–3 beats per minute.
- If no pulse or breathing, start CPR. Do not delay CPR because of cold. Continue until emergency services arrive.
- Handle with extreme care. Any sudden movement could trigger ventricular fibrillation.
- Do not give food, drink, or medications by mouth.
- Apply gentle heat to the torso only. Do not move the limbs. Do not rub.
- If they are conscious, keep them lying flat. Do not sit them up.
The key principle: severe hypothermia patients have survived after hours of CPR because the cold protected their brain. Do not stop resuscitation efforts unless a medical professional declares death after rewarming.
Hypothermia Prevention for UK Van Life
In the Van
Sleeping System Your sleeping bag and bedding must be appropriate for the ambient temperature. A 3-season sleeping bag rated to 0°C is insufficient for UK winter van life when the interior temperature drops to 2–5°C overnight.
Recommendations for UK winter van sleeping:
- Sleeping bag comfort rating of -5°C or lower (e.g., Vango Nitestar 350, Snugpak Elite 4)
- Or: a 0°C bag + a fleece liner (adds about 8°C to the comfort rating)
- Merino wool base layer for sleeping (Icebreaker or own-brand for about £30)
- Thermal hat for sleeping — 30% of body heat is lost through the head
- Hot water bottle (Nalgene bottle filled with boiled water, wrapped in a sock)
Heating Backup Your primary heat source (diesel heater, gas heater, or electric) should have a backup. The most reliable backup system is a redundant diesel heater — two Chinese 2kW units installed in parallel, each independently powered and fuelled. If one fails, the other takes over.
Simpler and cheaper: carry a gas camping stove (not inside the van — carbon monoxide risk) that you can use to heat the van in an emergency by boiling water for hot water bottles. Never use a camping stove or barbecue inside a van for warmth.
Carbon Monoxide Alarm Fit a CO alarm in the sleeping area. Most hypothermia incidents in vans are compounded by CO poisoning from faulty heaters. CO alarms cost £15–£25 and should be replaced every 5 years. Test monthly.
Moisture Management Wet bedding causes rapid heat loss. UK winter condensation inside a van is relentless. Use a Kip Cover or similar fitted under-blanket that wicks moisture away from the mattress. Air bedding daily (open the roof vent and crack a window for 30 minutes after waking up).
Outside the Van
The Layering System When hiking, walking, or spending time outside the van in cold UK conditions:
- Base layer: merino wool or synthetic (not cotton). Cotton kills — it holds moisture against the skin and conducts heat away 25 times faster than dry fabric.
- Mid layer: fleece or synthetic insulation (PrimaLoft, Thinsulate). One or two layers depending on temperature.
- Outer layer: waterproof shell with taped seams. A good waterproof jacket (Berghaus, Rab, Mountain Equipment) costs £100–£200 and is worth it.
- Accessories: beanie hat, warm gloves, buff or neck gaiter. Most body heat is lost through the head and neck.
Wet = Hypothermia Risk If you get wet in cold weather, your risk of hypothermia increases dramatically. Change out of wet clothes immediately upon returning to the van. Keep a complete set of dry base layers, socks, and a towel accessible — not packed away in the bottom of a storage box.
The Buddy System Inform someone where you are going and when you plan to return. A simple text message to a friend or family member is enough. If you are hiking in a remote area (Cairngorms, Dartmoor, Snowdonia), leave a note in the van with your expected route and return time.
Alcohol and Cold Alcohol makes you feel warm by dilating blood vessels in the skin, but this actually increases heat loss from the body. A drink after a cold walk feels good but reduces your ability to rewarm effectively. Drink warm non-alcoholic fluids first, eat a hot meal, and have a drink only after you are fully warmed up.
Van Winter Emergency Kit
Keep these accessible (not buried in the garage):
- Spare merino wool base layer set (top and bottom)
- Survival bag or bivvy bag (Mylar, about £5)
- 2× chemical hand warmers (about £2 each, activated by bending)
- Head torch with fresh batteries
- High-calorie emergency food (protein bars, nuts, chocolate)
- Insulated flask with hot drink (winter only)
- First aid kit with space blanket
- Power bank charged and accessible (for phone — calling emergency services)
- Whistle (for attracting attention if you cannot move)
The total cost of an emergency kit is about £40–£60. Keep it in the cab, not in the back.
When to Call 999
Call emergency services if:
- The person is unconscious or confused
- Shivering has stopped but they are still cold
- Pulse is weak, irregular, or absent
- Breathing is slow or shallow
- They are not improving after 20 minutes of basic rewarming
- You suspect spinal injury or other trauma alongside hypothermia
When calling 999 from a remote location, use What3Words if you have the app. Give the ambulance service the exact location. Tell them: "I am with someone who has hypothermia. They are [conscious / unconscious]. We are in a van / tent / exposed location at [location]."
Related Reading
- Combating Van Life Isolation on the Road
- Winterising Your Van's Water System
- Seasonal Affective Disorder in Van Life
- Dealing with Bad Weather Blues on the Road
- Condensation Management in a Campervan
