19°C vs 20°C: the heating thermostat setting for comfort and lower bills

For decades, one magic number has ruled our thermostats.

But that supposedly “green” setting can leave you feeling chilly - and it may not cut your energy use as much as you assume.

All over Europe, households have repeatedly been encouraged to keep the heating at 19°C as a patriotic, planet‑minded act. The idea dates back to the oil shocks of the 1970s and, over time, it has taken on the tone of moral guidance. Energy experts now argue that this fixed target fails to reflect how buildings behave in reality - and how people actually experience warmth.

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

The 19°C recommendation began as an emergency response, rather than a comfort standard designed around today’s housing. It was shaped by a world of draughty homes, relatively low fuel prices, and far less control technology.

Now, property standards, daily routines and energy tariffs look very different. A single number can’t capture all of those variables.

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

The “one‑size‑fits‑all” rule is particularly weak because it overlooks three major realities:

• Different buildings, different losses: in an older, poorly insulated flat, heat escapes so quickly that 19°C on the thermostat can feel more like 17°C where you sit.
• Different regions, different winters: 19°C in a mild coastal city is a very different experience from 19°C in a damp, fog‑prone valley.
• Different lifestyles: someone working at a desk at home generally needs more warmth than a person moving around the house all day.

Advisers increasingly warn that treating 19°C as a moral ceiling has pushed many people into accepting poor comfort - or even underheating because they worry about “getting it wrong”.

Comfort is not a single number on a dial

Feeling warm indoors is more complicated than it sounds. A thermostat reports the air temperature, yet that’s only one ingredient in what your body perceives.

The hidden factors that change how warm you feel

• Insulation and draughts: cold walls, leaky windows and gaps under doors create chilly air movement, so you can feel cold even at 19–20°C.
• Humidity: very dry winter air can make skin feel cooler and leave your throat irritated, which often leads people to turn the heating up.
• Activity level: sitting to watch television or work at a laptop usually requires a higher room temperature than cleaning or cooking.
• Radiant temperature: when floors, windows and walls are cold, they draw heat from your body and reduce your sense of comfort.
• Clothing: 19°C feels entirely different in a thin T‑shirt compared with a jumper and warm socks at the same reading.

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

Because of these interactions, many specialists talk less about a single “correct” temperature and more about a comfort band - often 19°C to 21°C for living spaces - that you adjust to suit the home.

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

For modern homes, energy professionals often settle on 20°C as a more practical balance between day‑to‑day comfort and keeping bills under control.

• Better comfort for sedentary life: at 20°C, most people are comfortable while sitting, studying or working at a computer.
• Limited impact on costs in a decent home: in a reasonably insulated property, moving from 19°C to 20°C typically increases heating demand only modestly.
• Smart control makes it manageable: smart thermostats and radiator valves can maintain 20°C only when and where it’s 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 isn’t intended as a blanket setting for every room. Think of it as a reference point for main living areas, with the rest of the house adjusted around it.

Should every room be the same temperature?

Keeping the whole home at one uniform temperature is among the costliest heating habits. Rooms have different purposes, so it’s usually safe - and sensible - for them to sit 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 kind of “zoning” can reduce wasted heat substantially, especially if radiators or heating zones 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

Getting the main room to 20°C doesn’t automatically mean your energy spend will spiral. What matters is how the system is run and how well the home holds on to heat.

Practical steps that change the game

• Check insulation hotspots: lofts, windows and external doors are frequent offenders. Straightforward measures such as draught excluders or heavier curtains can make a dramatic difference to comfort.
• Use programmable or smart thermostats: set lower temperatures when you’re asleep or out, and schedule heat to come on shortly before you return.
• Let the sun work for you: on bright winter days, open curtains to bring in free heat, then close them at dusk to keep it in.
• Shut doors to cooler rooms: this stops warm air drifting away and concentrates heat where you’re spending time.
• Maintain your system: bleeding radiators, cleaning filters and servicing boilers improves efficiency and responsiveness.

These changes can alter how warm a room feels so much that some households can lower the setpoint slightly while still feeling more comfortable.

When 19°C is simply not enough

For plenty of people, 19°C isn’t merely a bit uncomfortable; it can also raise health concerns. Some groups are more vulnerable to cool indoor temperatures than general guidance implies.

• Older adults: ageing reduces the body’s ability to regulate temperature, and colder homes are associated with increased respiratory and cardiovascular risk.
• Young children and babies: they lose heat more quickly and may not communicate discomfort clearly.
• People with chronic conditions: those with respiratory illness, heart problems or arthritis can experience pain or fatigue in cooler rooms.

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

Public health bodies in several countries acknowledge this quietly, advising warmer living areas for at‑risk residents even where broad campaigns still repeat the 19°C message.

What “a degree more” really means for your bill

Many people worry that adding just one degree will send costs through the roof. In practice, the impact is more complicated and depends heavily on both your baseline and your home’s condition.

A simple scenario

Picture a reasonably insulated semi‑detached home in a temperate climate:

• With an average indoor temperature of 19°C through winter, the heating bill might be around £1,000.
• Increasing the main living space to 20°C, while keeping bedrooms and hallways cooler through zoning, may raise gas or electricity use by only a few per cent.
• Simple draught‑proofing plus better scheduling of heating hours can often cancel that increase out completely.

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

The commonly repeated claim that “one extra degree costs 7–10% more” typically assumes the entire property is heated to the same temperature, all day, with no efficiency improvements. That is not how most modern households operate.

Key terms that help you understand your own comfort

Two energy‑efficiency ideas are particularly helpful when deciding whether 19°C or 20°C makes more sense in your home.

• Setpoint temperature: the number you set on the thermostat. It may not match what you feel if walls, windows and floors are significantly colder.
• Thermal inertia: how slowly a home warms up and cools down. Heavy stone or concrete buildings often change temperature gradually, while lightweight constructions can swing from warm to cold quickly.

Homes with high thermal inertia can sometimes run at slightly lower temperatures without discomfort because surfaces stay warm for longer. Lighter buildings tend to gain more from zoning and tighter schedules, as they cool quickly when heating is reduced.

How to experiment safely with your own “ideal” temperature

If you’ve always followed the 19°C rule, trying a different setpoint doesn’t have to mean losing control of costs.

• Increase the temperature in your main living area by 0.5–1°C for one week only.
• At the same time, reduce little‑used rooms by 1–2°C and shorten your heating schedule by an hour in the morning or evening.
• Pay attention to how you feel: sleep quality, focus, aches, and whether you keep reaching for a blanket.
• Check your meter readings or in‑app energy data to measure the real effect rather than guessing.

This sort of small, controlled trial often shows that modest, targeted adjustments - rather than rigid loyalty to a single “official” number - deliver the best balance of comfort, health and cost.