Heatwave and Cold Weather: Seasonal Health Risks for Care Home Residents

Care home residents are among the most vulnerable people in the UK to extremes of temperature, whether that means a heatwave in July or a cold snap in January. Reduced mobility, thinner and less efficient thermoregulation, chronic conditions such as heart or respiratory disease, and cognitive impairment that can stop someone recognising or communicating that they are too hot or too cold all combine to raise the risk sharply for this group. Understanding the practical steps care staff can take at each stage of a seasonal alert is a core part of keeping residents safe year-round.

Heat-Health Alerts: What the Levels Mean

The UK's Heat-Health Alert system, issued jointly by the UK Health Security Agency and the Met Office, uses a tiered structure to signal rising risk, and care providers are expected to act differently at each level. At Yellow, the focus is on raising awareness and monitoring: staff should identify and check on residents most at risk, and make sure room thermometers are working and being read regularly. At Amber, homes are expected to follow their local heatwave emergency plan, prioritise checks on the highest-risk residents, monitor hydration and vital signs more closely, and factor heat risk into any discharge or admission planning. At Red, the guidance escalates further: homes should activate their full emergency plan, arrange surge staffing if needed, step up surveillance of all residents, and monitor vital signs closely across the home, not just for those already flagged as high-risk.

Practical measures that apply throughout a heat alert include cooling communal and bedrooms to below 26°C where possible using blinds, shade, and ventilation rather than relying solely on open windows, and storing medicines below 25°C, checking manufacturer guidance for any that need refrigeration. Encouraging regular fluids, light clothing, and avoiding the hottest part of the day for baths or outdoor activity all reduce the risk of heat-related illness in residents who may not proactively ask for water or shade themselves.

Cold Weather Risks and Minimum Temperatures

Cold poses an equally serious risk, and the guidance here has become more precise in recent years. Public Health England's recommended minimum indoor temperature for care settings, particularly for residents over 65 or with chronic illness, is 18°C (65°F) — this single figure has superseded the older Cold Weather Plan guidance, which suggested 21°C for living areas and 18°C for bedrooms. Below 18°C, the evidence points to a measurable rise in blood pressure, and with it an increased risk of blood clots, stroke, and heart attack, making consistent heating rather than occasional top-ups the safer approach.

The CQC has highlighted hypothermia as a recurring safety issue in inspections, with case examples involving heating or insulation failures and night checks that failed to pick up a resident who had become dangerously cold. Residents most at risk include older people, those with reduced mobility or sensory impairment, and anyone unable to reliably communicate that they feel cold — which is why NICE recommends asking vulnerable residents at least annually whether they have difficulty keeping warm, rather than assuming staff will always notice.

Building Seasonal Risk into Everyday Practice

Both heat and cold risks are easiest to manage when they are built into routine checks rather than treated as one-off emergency responses. This connects directly to business continuity and emergency planning, since severe weather is one of the most common triggers for activating a home's continuity plan, whether that means a power outage during a heatwave or burst pipes in a cold snap. Staff should also be alert to the links between temperature extremes and other risks already covered in training, such as the connection between dehydration and postural hypotension, which can worsen in hot weather and increase the risk of a fall, and the general principles covered in falls prevention, since cold, stiff joints and reduced outdoor mobility in winter can also raise fall risk.

A simple seasonal checklist — working thermometers in every room, a clear escalation point for each alert level, medicines stored within their temperature range, and a named person responsible for checking on the highest-risk residents — turns national guidance into something a home can actually act on during a real heatwave or cold snap, rather than discovering gaps after the event.

Frequently Asked Questions

What temperature should a care home be kept at in winter?
Public Health England recommends a minimum of 18°C throughout occupied rooms, particularly for residents over 65 or with chronic illness, rather than the older guidance of 21°C in living areas and 18°C in bedrooms.

What should staff do at an Amber Heat-Health Alert?
Follow the home's heatwave emergency plan, prioritise checks on the highest-risk residents, monitor hydration and vital signs more closely, and factor heat risk into any discharge or admission decisions.

Why are care home residents more vulnerable to temperature extremes?
Reduced mobility, less efficient thermoregulation, chronic health conditions, and cognitive impairment that can prevent someone recognising or reporting that they are too hot or too cold all raise the risk compared with the general population.