Why 19°C Heating May Not Be Enough – and Why 20°C Works Better

For decades, a single magic number has governed our thermostats.

However, that supposedly “green” setting may leave you feeling cold without delivering the savings you expect.

For years, households across Europe have been encouraged to keep their heating at 19°C as a gesture of patriotism and environmental responsibility. Originating in the oil crises of the 1970s, the recommendation gradually took on the weight of moral guidance. Energy experts now say that this fixed target fails to account for the way homes perform in reality and the way people perceive warmth.

Why 19°C became a dogma – and why it no longer fits

The 19°C recommendation was introduced as an emergency response rather than a scientifically designed comfort standard for contemporary homes. It was based on the assumptions of draughty properties, inexpensive fuel and much less advanced technology.

Homes, daily routines and energy costs have all moved on since then. A single figure cannot represent every one of those differences.

19°C is a political and historical compromise, not a personalised comfort setting for a 2024 household.

Three major oversights make the “one-size-fits-all” approach unreliable:

• Different buildings, different heat loss: an older flat with poor insulation can lose warmth so quickly that a thermostat set to 19°C may feel like 17°C when you are sitting on the sofa.
• Different regions, different winters: 19°C in a mild coastal town does not feel the same as 19°C in a damp valley prone to fog.
• Different lifestyles: someone working at a desk from home generally requires more warmth than a person who is regularly moving around the house.

Energy advisers increasingly warn that presenting 19°C as a moral ceiling has encouraged people to tolerate inadequate comfort or, worse, heat their homes too little because they fear they are “doing it wrong”.

Comfort is not a single number on a dial

Thermal comfort is more complicated than it may appear. A thermostat measures air temperature, but that is only one element of the temperature your body experiences.

The hidden factors that change how warm you feel

• Insulation and draughts: cold walls, ill-fitting windows and gaps beneath doors produce chilly air currents, leaving you cold even when the room is at 19–20°C.
• Humidity: exceptionally dry air, which is common during winter, can make your skin feel colder and irritate your throat, leading you to increase the heating.
• Activity level: sitting to watch television or use a laptop requires a warmer room than cleaning or cooking does.
• Radiant temperature: cold floors, windows and walls can “steal” warmth from your body, reducing how comfortable the room feels.
• Clothing: wearing a light T-shirt at 19°C feels entirely unlike wearing a jumper and warm socks at the same temperature.

Two rooms at 19°C can feel radically different: one cosy, one icy, depending on draughts, surfaces and humidity.

For these reasons, specialists increasingly focus on a comfort range rather than one fixed “right” temperature. For living spaces, this is often between 19°C and 21°C, with adjustments made for each individual home.

Why many experts now point to 20°C as a better target

Energy experts often identify 20°C as a more practical balance between comfort and keeping bills under control in modern properties.

• Greater comfort for sedentary routines: at 20°C, most people are comfortable when seated, studying or working at a computer.
• A limited effect on costs in a decent home: in a reasonably well-insulated property, increasing the thermostat from 19°C to 20°C will usually raise heating use by a relatively modest amount.
• Smart controls keep it manageable: modern thermostats and smart radiator valves can maintain 20°C only in the places and at the times it is needed, reducing waste elsewhere.

In many homes, 20°C functions as a “comfort anchor”: warm enough for daily life, flexible enough to stay on top of bills.

Importantly, 20°C is not intended to be a blanket setting for every room. It is a useful central reference point for principal living areas, while temperatures elsewhere can be adjusted accordingly.

Should every room be the same temperature?

Keeping every part of a home at the same temperature is among the costliest heating habits. As rooms serve different purposes, they can safely be maintained at different temperatures.

A simple temperature plan by room

Room	Suggested range	Main goal
Living room / home office	19–20°C	Daytime comfort while sitting
Bedrooms	16–18°C	Good sleep and energy savings
Bathroom (during use)	21–22°C	Short bursts of high comfort after showers
Hallways, storage, utility	15–17°C	Frost protection and basic comfort in passing

This approach to zoning can reduce wasted energy considerably, particularly where radiators or areas can be controlled independently using valves or smart thermostats.

Heating the right rooms at the right time often matters more than obsessing over a single magic number.

How to keep 20°C without blowing your bill

Achieving 20°C in the main room does not necessarily result in excessive energy costs. How you operate the heating system has a significant effect.

Practical steps that change the game

• Check insulation weak points: lofts, windows and external doors are common sources of heat loss. Straightforward measures, such as draught excluders or heavier curtains, can make a dramatic difference to comfort.
• Use programmable or smart thermostats: set cooler temperatures while you are asleep or away, then heat the property only before you return.
• Make use of the sun: on bright winter days, open curtains to gain free solar warmth, then shut them at dusk to retain it.
• Close doors to cooler rooms: this stops warm air escaping and keeps heat in the rooms you are using.
• Maintain the system: bleeding radiators, cleaning filters and having boilers serviced helps them operate efficiently and respond more effectively.

These measures can alter the actual sensation of warmth in a room so much that some households can lower the thermostat a little while feeling more comfortable.

When 19°C is simply not enough

For many people, 19°C is more than merely uncomfortable: it may present a health concern. Certain groups are more vulnerable to cold indoor conditions than official guidance may imply.

• Older adults: ageing weakens the body's ability to regulate temperature, while cold homes are associated with an increased risk of respiratory and cardiovascular problems.
• Young children and babies: they lose body heat more rapidly and may be unable to communicate discomfort clearly.
• People with chronic conditions: people with respiratory illnesses, heart problems or arthritis may experience pain or fatigue in cooler surroundings.

For vulnerable people, 20°C in living areas is closer to a health measure than a luxury.

Public health bodies in several countries discreetly recognise this by advising warmer living rooms for residents at risk, even where general campaigns continue to refer to 19°C.

What “a degree more” really means for your bill

Many people worry that every additional degree will cause costs to soar. In practice, the picture is more complex and depends heavily on both the starting temperature and the condition of the property.

A simple scenario

Consider a reasonably insulated semi-detached house in a temperate climate:

• With an average indoor temperature of 19°C throughout winter, the heating bill is, for example, £1,000.
• Increasing the main living area to 20°C while keeping bedrooms and hallways cooler might raise gas or electricity consumption by only a few per cent.
• Basic draught-proofing and improved control over heating times can frequently cancel out that increase altogether.

In many real homes, smart control and small insulation tweaks save more than the extra degree costs.

The frequently repeated claim that “one extra degree costs 7–10% more” generally assumes that an entire house is heated evenly all day without any efficiency improvements. That is no longer how most modern households operate.

Key terms that help you understand your own comfort

Two energy-efficiency ideas can help when deciding whether 19°C or 20°C is more suitable for your home.

• Setpoint temperature: this is the figure programmed into the thermostat. It may not match the temperature you experience when walls, windows and floors are substantially colder.
• Thermal inertia: this refers to the speed at which a home warms up and cools down. Buildings made from heavy stone or concrete can change temperature slowly, whereas lightweight structures may become hot or cold very quickly.

Homes with high thermal inertia may be comfortable at slightly lower temperatures because their surfaces retain warmth for longer. Lightweight properties gain more from zoning and closely timed schedules because they cool rapidly once the heating is switched off.

How to experiment safely with your own “ideal” temperature

If you have always followed the 19°C rule, trying a different setting need not mean sacrificing control of your spending.

• Increase the temperature of your main living area by 0.5–1°C for one week only.
• At the same time, lower the temperature in rarely used rooms by 1–2°C and shorten your heating schedule by an hour in either the morning or evening.
• Pay attention to how you feel, including sleep quality, concentration, aches and whether you are constantly reaching for a blanket.
• Review your meter or energy-app data to identify the real effect instead of making assumptions.

A small, controlled trial like this often shows that modest changes, rather than strict compliance with one “official” number, provide the strongest balance of comfort, health and cost.