Ideal Thermostat Temperature for a Home: Room Settings & Heating Guide

What Is the Ideal Thermostat Temperature for a Home?

For many UK homes, around 18-21°C is a sensible thermostat temperature range. If you are at home and want a warmer living space, around 20-21°C can be a useful starting point. Bedrooms and less-used rooms can usually be cooler. Your ideal thermostat temperature also depends on insulation, the heating system, room size and personal preference.

A home that loses heat quickly may feel colder at the same thermostat setting than a well-insulated home. If rooms struggle to reach the temperature shown on the thermostat, changing the setting may not solve the underlying problem.

The important point is to use the thermostat as a temperature control rather than simply turning it up whenever the house feels cold.

Room Thermostat Settings: What Temperature Should You Set?

If you are asking “what temperature should my thermostat be?”, start with the temperature that feels comfortable when you are using the room.

A practical guide is:

• Living areas when occupied: 20-22°C
• General home temperature: 18-21°C
• Bedrooms at night: 16-18°C
• Less-used areas: 15-18°C
• Away from home: reduce the setting rather than heating normally

These are starting points rather than fixed rules. Personal comfort matters, so adjust the temperature if your household needs a warmer or cooler home. For people who are more sensitive to cold, maintaining a suitable indoor temperature becomes particularly important

Recommended Temperature When You Are at Home

For living rooms and other frequently used areas, 20-22°C can provide a comfortable temperature for many households. If 22°C feels too warm, try reducing the thermostat gradually. Even a small change can make a noticeable difference to how often the heating operates. If you are comfortable at 19°C or 20°C, there is usually no reason to set the thermostat higher. The best thermostat setting is the lowest temperature that keeps your household comfortable.

Thermostat Settings When Sleeping or Away

You do not necessarily need the same temperature overnight as you do during the day. Bedrooms are often comfortable at around 16-18°C. A programmable or smart thermostat can reduce the heating automatically at night and bring it back up before you need it in the morning.

The same approach can be used when you are away from home. Rather than maintaining your normal daytime temperature while nobody is there, use a lower setback temperature. This reduces the amount of heating needed while still allowing the property to be brought back to a comfortable temperature later.

Setback Temperature UK: How Low Should You Go?

A setback temperature is the lower temperature you use when the home is empty or when you are asleep. There is no single setback temperature that works for every UK home. A modest reduction from your normal setting is a practical approach. For example, if your normal thermostat setting is 20°C, you could use a lower setting while sleeping or away.

Avoid making large changes simply to try to save more money if the home then becomes uncomfortably cold or takes a long time to warm back up. The right setback temperature depends on your home, insulation, heating system and how long the property is unoccupied.

Optimal Thermostat Settings by Season

Your optimal thermostat settings may change throughout the year. The outside temperature, how much heat your home loses and how often you need the heating will all affect the setting that works best.

Winter Thermostat Settings

During winter, many households use around 20-22°C in living areas when they are occupied. If you are comfortable at a lower setting, there is no need to increase it simply because it is cold outside. At night or when the property is empty, use a lower scheduled temperature where appropriate. Keep an eye on rooms that become particularly cold. If one room remains cold while the thermostat says the house has reached its target temperature, check the radiator and heating controls rather than continually increasing the main thermostat.

Autumn and Spring Thermostat Settings

Autumn and spring can bring large changes in outdoor temperature from one day to the next. A setting around 18-20°C may be suitable as a starting point, but you may not need the heating continuously. Use your thermostat schedule to match your routine. On warmer days, the heating may need to run less often. On colder days, it may need to operate for longer.

Summer Thermostat Settings

In summer, central heating will usually be switched off unless the weather becomes unexpectedly cold. If your home becomes cool during an unusual cold spell, use the thermostat to maintain a comfortable indoor temperature rather than leaving the heating running unnecessarily. Good ventilation can also help manage indoor conditions when outdoor temperatures allow it.

Best Thermostat Settings for a 2-Storey House

A two-storey house does not necessarily need one thermostat setting for the whole property. Heat naturally behaves differently upstairs and downstairs. Rooms may also have different levels of insulation, sunlight and use. If you have one main room thermostat, it will normally control the heating based on the temperature around that thermostat. This means another room can be warmer or colder even when the thermostat has reached its target.

For example, you may find that upstairs bedrooms are comfortable at a lower temperature than a downstairs living room. Instead of continually changing the main thermostat, use radiator controls where available to adjust individual rooms. If your heating system has zoning or compatible smart controls, separate areas can also be managed more precisely.

Setting Temperatures Upstairs and Downstairs

Start with a comfortable main thermostat setting and then adjust individual rooms using their available heating controls. Frequently used rooms can be kept warmer, while bedrooms, hallways and other less-used areas can be cooler. This approach gives you more control than trying to use one thermostat temperature for every room. If there is a large difference between upstairs and downstairs temperatures, it may also be worth checking radiator performance, balancing and the condition of the central heating system.

Using Radiator Valves for Room-by-Room Control

Thermostatic radiator valves, or TRVs, regulate the flow of hot water into individual radiators. They allow you to control the heat output of a radiator without changing the main room thermostat. This makes them useful when different rooms need different temperatures. For example, a bedroom may need less heat than a living room. A hallway may also need less heating than a room where you spend most of your time. TRVs are therefore an important part of effective radiator temperature control.

Thermostat Temperature Range for Different Rooms

Different rooms do not always need the same thermostat temperature.

Using the right settings for each space can improve comfort and avoid heating rooms more than necessary.

Living Rooms and Kitchens

Living areas are normally occupied more often, so around 20-22°C can be a comfortable starting point. Adjust the setting according to how the room feels rather than automatically choosing the highest temperature.

Bedrooms

A bedroom temperature of around 16-18°C can be suitable for many people at night. Use your thermostat schedule or radiator controls to reduce the temperature overnight where appropriate.

Hallways and Less-Used Rooms

Hallways, laundry areas and other less frequently used spaces can generally be cooler. Around 15-18°C may be suitable as a starting point, depending on the property and how the space is used. Do not assume every room needs to be heated to the same temperature as your main living area.

Baby Rooms and Rooms Used by Older People

Baby rooms and rooms used by older people benefit from more careful attention, since both groups are more vulnerable to temperatures that would be comfortable for other adults.

For a baby's room, the NHS and the Lullaby Trust recommend keeping the temperature between 16–20°C. This isn't just a comfort guideline — overheating is a recognised risk factor for sudden infant death syndrome (SIDS), so the room shouldn't be heated above this range even in cold weather. Dress the baby appropriately for the room temperature rather than turning the heating up further.

For rooms used by older people, the NHS and Age UK recommend a minimum of 18°C throughout the home, with living areas that are in regular use often kept around 21°C for comfort. Older people can be more vulnerable to cold-related health problems, so consistently maintaining at least this minimum matters more than for other rooms in the house.

Use a separate room thermometer if you need to check the actual temperature of a particular room rather than relying only on the setting shown on the main thermostat. If you have specific health concerns for a baby or an older or vulnerable household member, the NHS and Lullaby Trust websites have detailed, up-to-date safety guidance beyond general heating advice.

How Room Thermostat Settings Work With Your Radiators

Your thermostat and radiators perform different jobs. The thermostat measures the temperature in the area where it is installed and controls when the heating system operates. Radiators then release heat into individual rooms. This means changing the thermostat does not directly set the temperature of every radiator. Radiator valves can be used to regulate individual rooms. TRVs are particularly useful because they allow the heat output of each radiator to be adjusted separately. If one room is consistently colder than the rest of the house, check its radiator and valve before simply increasing the whole-house thermostat setting. Poor radiator performance can also be a sign that central heating and radiator problems are affecting your system.

When Should You Turn the Heating On?

There is no single date when every home should turn its heating on. Use your thermostat and heating schedule according to indoor temperature and your household's needs. During autumn and spring, you may only need heating at certain times of the day. During colder winter weather, you are likely to need it more regularly. A programmable thermostat can make this easier by following your normal routine. For example, you can schedule the heating to come on before you normally wake up and reduce the temperature when you go to bed. The aim is to heat the home when you need it rather than relying on manual adjustments throughout the day.

Common Thermostat Setting Mistakes

Turning the Thermostat Up Too Far

Setting the thermostat to 25°C will not make the heating warm the house faster than setting it to 20°C. It simply gives the system a higher target temperature. Choose the temperature you actually want and allow the heating system time to reach it.

Constantly Changing the Temperature

Regularly moving the thermostat up and down can make it harder to maintain a consistent routine. A programmed schedule can be more convenient if your daily pattern is predictable.

Ignoring Individual Rooms

A single thermostat cannot always account for differences between rooms. Use radiator valves or zoning controls where available to manage rooms separately.

Poor Thermostat Placement

A thermostat should not be positioned where it is affected by direct sunlight, strong draughts or another heat source. An inaccurate reading can cause the heating system to switch on or off at the wrong time.

Not Using Programmable or Smart Features

If your thermostat supports scheduling, use it. Smart thermostats may also offer remote heating control through a smartphone app, allowing you to adjust settings when you are away from home.

How to Improve Heating Control and Efficiency

Good heating control starts with the correct thermostat temperature, but the wider central heating system also matters. Make sure radiators are heating properly and that radiator valves are working as expected. If one or more radiators remain cold, have cold patches or need frequent attention, the problem may not be your thermostat setting. A heating system that is dirty or poorly balanced can also affect how effectively heat is distributed around the property. Regular heating maintenance can help identify these problems before they become more disruptive.

When Your Thermostat Setting Is Not the Problem

If you have tried reasonable room thermostat settings but your home still feels cold, increasing the temperature may not be the best solution. Look at how the heating system is performing.

Common signs that the problem may be elsewhere include:

• Radiators that do not heat evenly.
• Cold spots on radiators.
• Some rooms staying cold while others become too warm.
• Radiators taking a long time to heat up.
• Frequent heating system problems.
• Uneven heat distribution around the property.

Radiators are a key part of a central heating system. Their condition, valves and the cleanliness of the system can all affect heating performance. If your central heating system is suffering from poor circulation or sludge build-up, a professional assessment can determine whether system cleaning or a central heating powerflush is appropriate.

If a radiator is damaged, badly corroded or no longer suitable for the room, radiator replacement may be a better option.

Get Help With Your Central Heating System

The right thermostat temperature can improve comfort and heating control, but it cannot compensate for an inefficient or poorly performing central heating system.

If your radiators are not heating properly, your rooms have uneven temperatures or your heating system is struggling to circulate heat, Serviceteam can assess the system and recommend the appropriate solution.

The aim is simple: set the thermostat to a comfortable temperature, use your radiator controls effectively and make sure the heating system itself is working properly.

Need help because changing the thermostat temperature is not fixing the problem? If your radiators are cold, heating is uneven or some rooms never reach the temperature you set, Serviceteam can assess your central heating system and recommend the right solution.