No-Cost and Low-Cost Ways to Cut Energy Use First

The fastest cuts to an energy bill come from actions that cost nothing and take minutes. Turning the thermostat down by one degree Celsius could save as much as 10 per cent on heating bills, according to official guidance¹. Only boiling the water you need saves around £10 a year in England, Scotland and Wales, and around £11 in Northern Ireland². Reducing a combi boiler's flow temperature can lower bills as well³. None of these needs a purchase, an installer or permission from anyone.

The backdrop matters too. Official statistics record that measures taken across the country reduced energy bills by an average of £150 from April 2026⁴, and a minister stated in Parliament in March 2026 that action through the Budget removed costs from energy bills and reduced energy costs by 7 per cent from April⁵. Those are national figures, not a household's guarantee, but they show the direction of travel. What a single household can control starts with the settings and habits described on this page.

Free first steps to cut your energy use

The measures on this page share one feature: they reduce demand rather than adding equipment. Parliamentary research on demand side response notes that shifting and shaping how households use energy could make household energy bills cheaper⁷. The same logic applies at the smallest scale. A thermostat set one degree lower, a kettle filled for two cups rather than six, and a heating schedule that matches the hours the house is actually occupied all cut the energy bought from a supplier without touching the fabric of the building.

That framing matters for energy independence. Every kilowatt hour not used is a kilowatt hour that does not have to be paid for, generated or stored. A household that trims its demand first needs a smaller solar array, a smaller battery and a smaller heat pump later, because those investments are sized against the demand they serve. Starting with the free measures is therefore not just a way to save money this month; it is the correct first step in any longer plan, and it is where the getting started guide begins.

The savings published for these measures are modest individually but real. The kettle saving alone is around £10 a year², and the thermostat saving is a percentage of the heating bill, which in a home with high heating costs is the larger prize¹. The two together, plus a heating schedule that stops the system running when nobody is home, form the core of what can be done in a single afternoon.

Turn down by one degree: the rule for your thermostat

The most quoted rule in home energy advice is also one of the simplest: turn the thermostat down by one degree Celsius. Official guidance for Northern Ireland states it plainly:

nidirect, the Northern Ireland government service¹

The same figure appears in nidirect's central heating controls guidance⁸, in the British Gas Energy Trust's tips for UK households, published April 2026, which states that "Turning it down by just 1°C could save 10% on your bill"⁹, and in nidirect's energy efficiency tips, which put it as "up to 10 per cent"¹⁰. One English council guidance document goes further, stating that "Reducing the thermostat by 1 ˚ could save up to 25% of heating bills and associated carbon"¹¹. That 25 per cent figure is a single source and a much higher estimate than the others; treat the 10 per cent figure as the better supported range, and the higher one as an upper bound from one authority.

The schedule matters as much as the number on the dial. A thermostat holds a home at one temperature; a programmer or timer decides when the system runs at all. Setting the heating to come on shortly before the house is used and go off before it empties removes the hours of wasted output that a constant setting produces. The saving depends on how warm the home was kept, how long the heating ran and how quickly the house loses heat, which is covered in detail on where a UK home loses heat.

For a household planning bigger work, the one-degree rule is also a useful test. If a home feels comfortable one degree lower after draught proofing and insulation, the same boiler serves a smaller load, and the order of energy improvements becomes cheaper at every step.

Boiler flow temperature: a setting the thermostat does not control

Flow temperature is not the same as the thermostat. The thermostat sets how warm the rooms should be; the flow temperature sets how hot the water leaving the boiler is as it travels to the radiators. Many combi boilers are installed with a flow temperature higher than the radiators need, so the boiler short-cycles and wastes fuel. Welsh Government guidance, drawing on consumer advice, states:

Climate Action Wales, Five top tips to cut your energy bills³

The reason is efficiency. A boiler heating water to a lower target condenses more of the flue gases, extracting heat that a higher setting sends out of the flue. The trade-off is that radiators emit less heat at a lower flow temperature, so the system takes longer to warm the house and may struggle in the coldest weather. The practical approach is to reduce the setting in stages through the heating season and see whether the home still reaches temperature; if it does not on the coldest days, the setting can be raised temporarily.

This measure costs nothing and can be reversed at any time, which makes it one of the safest adjustments a householder can make. It applies to combi boilers in particular; homes with a hot water cylinder need the cylinder stored hot enough for safety, so the flow temperature interacts with the hot water schedule as well. The heating controls savings page covers how controls and settings interact in more depth.

A full set of heating controls and the savings it brings

A full set of heating controls means the system can decide when to heat, where to heat and to what temperature. In practice that means a programmer or timer, a room thermostat, and thermostatic radiator valves on the radiators. Where a low-temperature heating system also provides hot water, official guidance on low-temperature domestic heating states that "controls must be installed that ensure it does not supply hot water services and space heating service simultaneously"¹². Self-build sustainability guidance goes further on the smart end: "Install smart systems that control lighting, heating, and cooling based on occupancy and time of day"¹³.

What controls save depends on the starting point. Ofgem's consumer protection guidance on load control gives worked examples for a large house with electric heating and high usage, around £300 per month: a low level of control saves 2 per cent of the heating bill, about £6 a month; medium control saves 4 per cent, about £12 a month; and high control saves 6 per cent, about £18 a month¹⁴. A Scottish Government programme report on smart electric storage heating records energy bill reductions for end consumers of up to 30 per cent¹⁵, though that figure comes from a specific trial context rather than a general expectation.

Figures from Ofgem load control consumer protection guidance, August 2026¹⁴

The spread between those figures is wide because "controls" covers everything from a basic timer to occupancy-aware smart systems. A home with no thermostat at all gains more from adding one than a home with a full set gains from upgrading it. The government's rapid evidence assessment on how heating controls affect domestic energy demand, published 28 January 2014, remains the reference study on the evidence base¹⁶, and its age is worth noting: control technology has moved on considerably since.

Upgrading controls: prices, fitting and the right time

Heating controls can be fitted to an existing system without replacing the boiler. Two points of official guidance confirm the rules around this. First, the requirement for a full set of heating controls in the property following a boiler installation was removed from the ECO4 delivery guidance in August 2025¹⁷, so a boiler replacement under that scheme no longer triggers the controls requirement. Second, building regulations guidance states that "If a heating system or hot water system is to be replaced then a building control application may not be required, and, " if required, it may not be necessary to apply in advance of the work¹⁹.

Costs for controls are installer-quoted; no published price is given here, so no range is offered. What is published is the scale of activity: official ECO statistics record 514,780 heating controls measures notified to 11 August 2026²⁰, and Warm Homes social housing fund statistics for August 2026 show heating controls made up 8 per cent of reported measures²². That volume indicates controls are among the most commonly installed measures in supported schemes, which usually means installers are familiar with the work and it is quick.

Some schemes bundle controls with other low-cost measures. Northern Ireland's Better Energy Homes Plus scheme lists, among its measures, an A rated oil or gas boiler conversion or upgrade, cavity wall and loft insulation, LED light bulbs, remote smart heating controls, a low-flow or eco shower head, a hot water tank jacket, reflective radiator panels and draught proofing where required²³. That list is a useful picture of what a funded low-cost package looks like when one is available; the checking what grant help you can get page covers eligibility.

Local advice services can help with the decision. Tameside Council's energy saving pages describe "providing advice, planning and delivery to help reduce the costs of your bills as well as carbon emissions associated with home energy and heating"²⁴. Free advice by nation is listed on the England, Scotland, Wales and Northern Ireland advice pages.

Kettle habits: pennies per boil, around £10 saved yearly

The kettle is the appliance most households use every day and most often overfill. Independent guidance from December 2025 calculates that a kettle used 15 minutes per day consumes around 24 kWh per month, which on a standard variable rate tariff works out at £6.27 per month². Over a year that is a meaningful line in the budget for an appliance that boils water.

The fix is free. The same guidance states that by only boiling as much water as needed, "you could save around £10 per year. (£11 in Northern Ireland)"². The British Gas Energy Trust's tips, published April 2026, give the same measure: "Avoid overfilling the kettle, saving around £10 a year"⁹. Two independent sources agreeing on the same figure is about as solid as household savings figures get.

The Northern Ireland difference reflects that country's separate electricity market and prices. It is small in absolute terms, but it is a reminder that published savings are calculated against a tariff assumption, and a household on a different tariff saves a different amount. The eco kettle savings and kettle or electric hob pages compare the equipment options; the habit itself needs no purchase.

Tumble dryers: long running times at high wattage

Tumble dryers are in a different class from kettles. A kettle draws high power for two or three minutes; a tumble dryer draws high power for an hour or more per load, making it the appliance most capable of moving a monthly bill on its own. The tumble dryer vs drying clothes outside page sets out the running cost comparison in detail.

The policy picture is also moving. A government consultation on raising product standards for household tumble dryers, published 17 July 2025, describes "reforming the current household tumble dryers energy efficiency, condensation efficiency scales, and introducing a new acoustic airborne noise emission and repairability index scale"²⁵. In plain terms, the labels on new dryers are being redesigned so efficiency is measured differently, noise is declared and repairability is scored. For a household replacing a dryer, that means the label on the shop floor will carry more information than the label on an older machine did.

For a household not replacing anything, the no-cost measure is simply to use the dryer less: drying outside or on a rack where the home allows it, and spinning clothes well before any dryer use so less water has to be evaporated. The saving is proportional to how many loads are moved off the machine, and unlike the kettle there is no single published national figure for the habit, so no number is claimed here.

What the letters on appliance labels tell you

The energy label on appliances has changed, and the change catches many people out. Independent guidance from December 2025 explains:

Confused.com, appliance running costs guide²

The old scale had become top-heavy: most decent appliances scored A+ or better, so the label told a buyer little. The reset scale runs A to G, and an A on the new scale is a genuinely high bar. The practical consequence is that a new appliance labelled, say, C may be efficient in absolute terms, and an old A+++ label cannot be compared directly with a new letter. When replacing something, compare like with like: the annual energy consumption figure in kilowatt hours, which the label also carries, is the number to use.

This matters most for the appliances that run constantly or for long sessions: fridge freezers, which never switch off, and tumble dryers, covered above. The fridge freezer running cost and appliance upgrade savings pages carry the detail. The rule for a household on a small budget is that ratings are a replacement-time decision, not a reason to scrap a working appliance: the energy used to make a new machine is real, and the running-cost saving only pays back over years.

Your account details: who supplies you, MPAN and MPRN

Before any energy work, a household needs to know three things: who supplies the gas and electricity, and the meter point numbers for each fuel. The MPAN, or Meter Point Administration Number, is the electricity one. Independent guidance explains: "It's usually 13 digits long and can be found on your electricity bill. Look for a grid of numbers with a large letter 'S'"²⁶; the MPAN is the bottom row of numbers in that grid. The MPRN is the gas equivalent.

To find your network operator, the Energy Ombudsman states that "You can find out who your network provider is via the Energy Networks Association website"²⁷. The Citizens Advice smart meter checker needs only "your gas and electricity MPANs (meter point administration numbers) and your postcode" to check your meter details²⁸. These numbers matter when moving home, switching supplier or checking whether a smart meter has been installed, and the moving home energy checklist covers the first-week tasks.

Suppliers themselves are a source of help with efficiency. nidirect notes that suppliers may be "offering advice on more efficient use of energy that could help you to cut your bills"²⁹, and Ofgem's guidance on getting help with your energy bills advises households to "review your current payments and debt repayments"³⁰. Knowing your numbers is the precondition for all of it: without a bill read properly, a household cannot check a tariff, a payment or a meter.

Smart meters: the data matters more than the savings

A smart meter does not save energy by itself. What it does is give a household up-to-date information on energy use, and Ofgem's guidance states that with it "you could find ways to save money using up-to-date information on your energy use"³¹. The saving comes from what the household does with the data: seeing which hours cost most, which appliances draw most, and whether the habits described on this page are actually working. The baseline your energy use page covers how to build that picture.

Getting one is straightforward. Smart DCC guidance states that "If you haven't already been offered a smart meter, you can request one from your supplier"³³. Welsh Government guidance adds that installation "typically takes about 90 minutes and is free of charge"⁶. Private renters can have one too: the Energy Ombudsman states that "If you are a private renter, if the energy bills are in your name or you prepay for your energy, you can choose to have" a smart meter, after checking the tenancy agreement and letting the landlord know³⁴.

For a household thinking about time-of-use tariffs, load control or future solar and battery investment, a smart meter is close to a prerequisite, because those options depend on half-hourly data. That is the independence angle: the meter does not free a home from a supplier, but it gives the household the same visibility the supplier has, which is the basis for every later decision about generation, storage and tariff.

What to do after these steps

The free and low-cost measures on this page are the first rung, not the whole ladder. Once the thermostat, flow temperature, kettle and habits are dealt with, the next step is knowing what the home itself needs. Official guidance for Northern Ireland states that "Looking at your Energy Performance Certificate (EPC) is a good starting point to help improve the energy efficiency of your property"³⁵, and the using an EPC to plan work page explains how to read one. In Scotland, a consultation on proposals for a Heat in Buildings Bill, published January 2026, explains that new certificates and ratings "will help us to monitor progress in the Bill's heat decarbonisation target and to underpin minimum energy efficiency standards"³⁶, so the EPC is set to carry more weight over time.

From there, the natural sequence is fabric first: draught proofing, then insulation, then low-carbon heat. The fabric first and what order should home energy improvements be done in pages set out the reasoning, and the dedicated pages on draught proofing savings, insulation savings and hot water cylinder insulation carry the published figures for each. Households on very small budgets can start with the where to start when the budget is very small page, and the payback periods compared page shows how the free measures stack against the funded ones.

The honest summary of independence is this: the measures on this page reduce dependence on a supplier by reducing what has to be bought from one. They do not remove it. The home still draws from the grid, still pays a tariff and still depends on the supplier's billing being right. But a household that has cut its demand, knows its MPAN and MPRN, and can see its use on a smart meter is in a far stronger position to take the next steps, whether those are insulation, solar, a battery or a heat pump, and to know whether each one actually paid back.