Hydration, Heatwaves & Cold Homes: A UK Guide to Staying Well

When to seek urgent help (999/111)

Who this guide is for

This page supports older adults, carers, people with long-term conditions, and anyone facing UK heatwaves or a cold home. It summarises trusted UK guidance in plain English and signposts official support. It is general information, not personal medical advice—speak to your GP, pharmacist or community team for individual care.

Hydration basics (all year)

• Aim for 6–8 drinks daily. Water, lower-fat milk, and sugar-free tea/coffee all count. Check your urine: pale yellow usually means you’re well hydrated. Increase fluids in hot weather or when active. (NHS Eatwell guidance.)
• Older adults & those with dementia may feel less thirst—offer regular small drinks and fluid-rich foods (soup, fruit, yoghurt, porridge).
• Avoid dehydration traps: alcohol, very salty foods, and long gaps without fluids.
• Illness (‘sick-day’ thinking): if you have vomiting/diarrhoea, consider oral rehydration solution (ORS) and follow any local “sick-day rules” you’ve been given; ask a pharmacist or your GP team if unsure.
• Do not over-drink. Very high intake in a short time can cause low blood sodium (hyponatraemia). If you have heart, kidney or liver disease, follow your clinician’s fluid advice.

Heatwaves: practical actions

1) Watch the UK Heat-Health Alerts

England uses joint UKHSA/Met Office Heat-Health Alerts (green → yellow → amber → red). Higher levels mean more risk and actions for services and the public. You can read the Adverse Weather and Health Plan (AWHP) overview and user guides on GOV.UK and sign up to alerts.

2) Keep your home cool

• By day: close curtains/blinds on sun-facing windows; switch off unnecessary lights and devices.
• By night: open windows if it’s cooler outside; aim for cross-ventilation to purge heat.
• Fans help below ~35 °C. Above that, fans are less effective and can worsen dehydration—use with cool water misting on skin if safe. (See UKHSA “Beat the heat”; evidence reviews.)
• Create a “cool room” for resting and sleeping (lowest, shadiest room).
• Pre-cool yourself: cool shower, damp cloths to neck/wrists, elevate legs, light clothing.

3) Keep your body cool

• Drink regularly; don’t wait for thirst. Carry water on journeys. Avoid alcohol in the heat.
• Plan activity early morning or late evening. Rest often; check on neighbours.
• Never leave anyone in a parked car. Take extra care near open water (risk of cold-water shock).

Medicines that raise heat risk

Do not stop medicines without advice. Heat can interact with certain drugs. Speak to your pharmacist, GP or specialist nurse if unsure.

• Diuretics, ACE inhibitors/ARBs and some blood-pressure drugs: higher dehydration/low blood-pressure risk in heat.
• Anticholinergic medicines (found in some antidepressants, antipsychotics, bladder drugs, antihistamines): can reduce sweating and impair cooling.
• Antipsychotics (e.g., clozapine): heat-stress susceptibility—seek prescriber advice on warning signs.
• SGLT2 inhibitors (type 2 diabetes): dehydration risk; know your local sick-day rules.
• Lithium: dehydration and salt changes can trigger toxicity—seek urgent clinical advice if unwell.

Ask your pharmacist for a heat-risk medicines review and written sick-day guidance.

Cold homes: staying warm safely

• Target indoor temps: many UK guidelines advise heating rooms used during the day and keeping living spaces around 18 °C or above—especially if you’re older, have reduced mobility, or long-term conditions.
• Dress in layers; use draft excluders; close curtains at dusk; heat the room you use most.
• Have hot drinks and regular meals; keep moving gently to boost warmth and circulation.
• Service boilers and flues; use a carbon monoxide alarm; never use outdoor heaters/grills indoors.
• If you struggle to heat your home, see the support schemes below and consider joining your supplier’s Priority Services Register (free).

Damp & mould: protect your lungs

Cold, under-ventilated homes increase condensation and mould, which can worsen asthma and cause respiratory infections. Report damp/mould early to your landlord or housing provider and ask for repairs. Ventilate safely (e.g., trickle vents, extractor fans when cooking/showering), heat consistently where possible, and wipe visible condensation promptly.

Money & energy help (UK)

• Warm Home Discount (England & Wales; Scotland differs): a one-off discount on electricity bills for eligible households—check GOV.UK and your supplier.
• Winter Fuel Payment (pension-age): payment to help with heating costs—check eligibility and deadlines on GOV.UK.
• Cold Weather Payment (certain benefits): automatic payment if your area has very cold weather for seven days—see GOV.UK for eligibility.
• Priority Services Register (PSR): free extra help from energy suppliers/network operators if you’re in a vulnerable situation (e.g., medical equipment needing power, disability, pregnancy, state pension age).

Schemes change—always check the latest on GOV.UK or Ofgem, and ask your supplier or local council energy advice team.

10-point home checklist

1. Thermometer in a living area and bedroom (aim ~18 °C in winter; keep bedrooms cool in heat).
2. Daily drinks plan (6–8 drinks; more in heat; limit alcohol).
3. Fan + spray bottle for light misting (use fans mainly below ~35 °C).
4. Close blinds by day; night-time cross-ventilation when cooler outside.
5. Cool shower/wet flannels for neck/wrists in heat; warm layers in cold.
6. Medication review for heat risk; keep a written sick-day plan.
7. Service boiler & fit CO alarm; know emergency numbers.
8. Report damp/mould early; improve ventilation as advised.
9. Check eligibility: Warm Home Discount, Winter Fuel Payment, Cold Weather Payment; join PSR.
10. Save NHS 111 and 999 in your phone; share this plan with family/carers.

FAQ

How much should I drink during a heatwave?

Most adults should aim for 6–8 drinks daily, more in hot weather or when active. Use urine colour (pale yellow) as a guide. People with heart, kidney or liver problems should follow individual clinical advice.

Are fans safe in extreme heat?

Fans can help below ~35 °C. Above that, they may be less effective and can worsen dehydration—use water-misting or take a cool shower, and seek cooler spaces if possible. Follow official UK “Beat the heat” advice.

What room temperature should I aim for in winter?

If you’re older, have reduced mobility or long-term conditions, try to keep living spaces around 18 °C or above. Warm clothing, draft-proofing and consistent heating help.

Which medicines raise heat risk?

Diuretics, some blood-pressure drugs, anticholinergics (including some antidepressants/antipsychotics/bladder meds), SGLT2 inhibitors, and lithium can increase heat-related risks. Don’t stop medicines—ask a pharmacist/GP for a review and sick-day plan.

When should I call 999 vs NHS 111?

Call 999 for symptoms of heatstroke (confusion, collapse, seizure, hot dry skin) or severe hypothermia (drowsy, slow breathing, unresponsive). Use NHS 111 for urgent advice when it’s not life-threatening.

Glossary

Heat exhaustion: early heat illness; usually improves within 30 minutes with cooling and fluids.

Heatstroke: life-threatening failure to cool; call 999.

Hypothermia: body temperature <35 °C—medical emergency.

PSR: Priority Services Register—free extra help from energy suppliers/network operators for eligible people.