Home energy conservation spans how households use energy, the fuels and equipment they choose, building insulation, weatherization participation and measured retrofit outcomes. The figures below distinguish U.S., global, UK, Great Britain and England populations, and identify whether each result is observed, surveyed, estimated or derived.
Key Home Energy Conservation Statistics
These are the most broadly useful figures across household energy use, efficiency and outcomes:
- In 2020, space heating and air conditioning accounted for 52% of annual energy consumption in U.S. homes.
- In 2020, water heating, lighting and refrigeration accounted for 25% of U.S. household energy use.
- In 2020, natural gas was used in 58% of U.S. homes.
- In 2020, about 13% of U.S. households used a heat pump as their main heating equipment.
- In 2024, about 90% of U.S. households reported using LED bulbs.
- In 2024, buildings accounted for around 30% of global energy demand.
- In 2023, space and water heating accounted for about 70% of home energy use in advanced economies.
- In 2025, UK domestic space heating represented 60.8% of domestic energy consumption.
- Between 2000 and 2025, UK domestic space-heating and water-heating consumption fell 32%, from 39.3 to 26.6 million tonnes of oil equivalent.
- At the end of 2024, cavity-wall insulation covered 71% of Great Britain homes with a cavity wall.
- At the end of 2024, loft insulation covered 67% of Great Britain homes with a loft.
- In 2023–24, 86% of English households used gas-fired main heating.
- In 2023–24, 2% of English dwellings were rated in the lowest energy-efficiency bands F or G.
- By 2023, the U.S. Weatherization Assistance Program had reached 7.2 million households since its inception.
- In 2022 dollars, DOE estimated average yearly savings of $372 per U.S. weatherized household.
- In program evaluations, weatherization reduced annual heating consumption by 18% for U.S. weatherized households.
- Between 1984 and 2021, reviewed residential retrofit programs measured an average consumption reduction of roughly 7.2%.
- Between 1984 and 2021, none of the reviewed retrofit studies reported savings of 50% or greater.
Contents
- Where U.S. homes use energy
- Global and UK home energy trends
- Residential insulation statistics
- Heating systems and conservation adoption
- Weatherization participation and household burden
- Measured residential retrofit savings
Where U.S. Homes Use Energy: Household Energy Conservation Statistics
The U.S. Energy Information Administration’s 2020 Residential Energy Consumption Survey (RECS) provides an end-use view of household demand. These percentages describe average household energy consumption, so they show where conservation opportunities are concentrated rather than measuring the savings available from a specific project.
| U.S. household end use, 2020 | Share of annual household energy | Definition or limitation |
|---|---|---|
| Space heating and air conditioning | 52% | Combined end-use share |
| Water heating, lighting and refrigeration | 25% | RECS end-use estimate |
| Other devices and appliances | 23% | Residual category; not one appliance |
Source: EIA, “Use of energy in homes”.
The same EIA accounting reports that retail electricity purchases represented about 44% of U.S. residential-sector end-use energy in 2020. Natural gas represented about 43%, petroleum about 8%, and renewables including geothermal, solar and wood fuels about 5%; these are residential-sector energy shares, not household fuel-use prevalence.
Natural gas was used in 58% of U.S. homes in 2020, while about 13% of households used a heat pump as their main heating equipment. Three-quarters of U.S. homes used two or more energy sources, which indicates energy-source diversity rather than conservation adoption.
Dwelling type also mattered: a detached single-family U.S. household consumed nearly three times as much energy as a household in an apartment building with five or more apartments in 2020. In 2024, about 90% of U.S. households reported using LED bulbs, although mixed bulb use was possible because the statistic is a preliminary RECS highlight.
Global and UK Home Energy Trends
Global building figures provide scale, but they are broader than household-only statistics. The International Energy Agency estimated that buildings accounted for around 30% of global energy demand in 2024 and contributed around 20% of the growth in global energy demand between 2019 and 2024.
The residential sector made up about 70% of total building energy demand globally in 2024, with commercial and public buildings making up 30%. In advanced-economy homes, space and water heating together accounted for about 70% of residential energy demand in 2023.
| Comparison | Period | Result |
|---|---|---|
| Buildings’ share of global energy demand | 2024 | Around 30% |
| Buildings’ share of global energy-demand growth | 2019–2024 | Around 20% |
| Residential share of building energy demand | 2024 | About 70% |
| Space and water heating in advanced-economy homes | 2023 | About 70% |
The IEA also estimated that per-capita space and water heating energy use in emerging and developing economies was less than one-fourth of advanced-economy levels in 2023. Climate, household circumstances and energy access affect that comparison, so it is not a direct efficiency ranking.
Source: IEA, “Energy Efficiency 2025: Buildings”.
UK domestic end-use estimates show the continued importance of heating. In 2025, domestic space heating represented 60.8% of UK domestic energy consumption and water heating represented 17.4%.
From 2000 to 2025, UK domestic space-heating and water-heating consumption fell 32%, from 39.3 million tonnes of oil equivalent (Mtoe) to 26.6 Mtoe. Over the same period, domestic cooking energy use increased by 0.2 Mtoe, or 15%.
These ECUK end-use shares are estimates based on domestic consumption and survey-informed assumptions, and the combined heating series is an observed historical series. Source: GOV.UK, “Energy Consumption in the UK (ECUK) 2026”.
Residential Insulation Statistics: Great Britain Building Efficiency
Great Britain’s December 2024 housing-stock estimates show different levels of coverage by construction type. The denominators are important: cavity-wall and solid-wall percentages apply only to homes with those wall types, while loft coverage applies to homes with a loft.
| Insulation measure, Great Britain | Homes at December 2024 | Coverage |
|---|---|---|
| Cavity-wall insulation | 15.2 million homes with cavity walls | 71% |
| Solid-wall insulation | 876,000 homes with solid walls | 10% |
| Loft insulation | 17.5 million homes with a loft | 67% |
Source: DESNZ, “Household Energy Efficiency Statistical Release”.
During 2024, Great Britain added about 214,100 homes with cavity-wall insulation, a 1.4% increase. Of that increase, 32,400 homes were retrofits and 181,700 were new builds; the source notes that new-build wall construction is partly assumed in its methodology.
Great Britain also added approximately 232,000 homes with at least 125 millimetres of loft insulation during 2024, a 1.3% increase. The increase comprised 68,800 retrofits and 163,200 new builds, and remains a stock-progress estimate rather than a direct measure of energy saved.
Because the insulation figures use different wall and loft denominators, their percentages should not be combined into a single household adoption rate. The statistical release also cautions that stock estimates can differ from English Housing Survey estimates because periods and methods differ.
Heating Systems and Home Energy Conservation Adoption in England
The English Housing Survey’s 2023–24 data describe main heating systems, not every heating appliance in a dwelling. Gas remained dominant, but the pattern varied sharply by geography, household type and tenure.
| Main heating system in England | Households, 2023–24 | Share |
|---|---|---|
| Gas-fired | About 21.2 million | 86% |
| Solid- or oil-fired | 809,000 | 3% |
| Electrical | About 2 million | 8% |
| Communal | 608,000 | 2% |
Source: GOV.UK, “English Housing Survey 2023 to 2024: low carbon technologies in English homes”.
Almost one-third of rural English households used solid-fuel or oil-fired heating in 2023–24, compared with 0.7% of urban households. Gas heating was used by 90% of urban households versus 51% of rural households.
Other household differences were also recorded:
- Gas heating was used by 89% of households whose household reference person was aged 35–49, compared with 85%–86% for younger and older groups.
- Gas heating was used by 92% of couples with dependent children and 81% of one-person households.
- Gas heating was used by 89% of owner occupiers, 83% of social renters and 80% of private renters.
In 2023–24, 553,000 English dwellings, or 2%, were rated in the lowest energy-efficiency bands F or G. This rating statistic describes dwelling efficiency bands; it is not a direct estimate of annual household energy consumption.
Weatherization Participation, Savings and Household Energy Burden
The U.S. Department of Energy’s Weatherization Assistance Program (WAP) provides a program-scale view of conservation among eligible households. By 2023, WAP services had reached 7.2 million U.S. households since the program began, while formula funds weatherized an average of 35,000 homes annually.
DOE reported average yearly energy savings of $372 per weatherized household in 2022 dollars. The fact sheet also reports more than $300 in annual cost savings per weatherized household; these are separate rounded or dollar-year-specific program figures, not one comparable time series.
WAP’s reported energy outcomes included an 18% reduction in annual heating consumption and a 7% reduction in annual electricity consumption. For every $1 invested, DOE reported $1.72 in energy benefits and $2.78 in non-energy benefits; the benefit categories are separate.
The program’s household-burden comparison reported that low-income households spent 14% of income on energy versus 3% for higher-income households. A further estimated non-energy benefit was $538 in annual pay savings from fewer missed work days after weatherization, while WAP funds supported 8,500 direct and indirect jobs.
Source: DOE, “Weatherization Assistance Program Fact Sheet”. These fact-sheet figures and cited evaluations cover different measures and periods, so they should not be treated as a single annual average for every weatherized home.
Measured Residential Retrofit Savings
A peer-reviewed systematic review examined 39 evaluations of 23 residential retrofit programs conducted between 1984 and 2021. The evaluations used post-retrofit billing or consumption data from 140,977 households, providing a large evidence base while remaining a set of program evaluations rather than a nationally representative sample.
Across the reviewed programs, the mean measured reduction in electricity and/or fuel consumption was roughly 7.2%. The review notes that total household energy savings may be smaller when households use multiple fuels, so the figure is not equivalent to a universal whole-home reduction.
None of the reviewed retrofit studies reported deep energy savings of 50% or greater. That is a finding about the studies included in the review, not proof that no individual project can achieve that outcome.
Source: Annual Review, “A Systematic Review of Energy Efficiency Home Retrofit Evaluation Studies”. The review reports measured program outcomes rather than engineering maximums; results vary with retrofit design, fuel mix, climate and household behavior.
Metered savings can also differ from expected technical savings because comfort taking may lead households to heat more frequently or to higher temperatures after efficiency improvements. This limitation is relevant when comparing program evaluations with insulation coverage, equipment adoption or modeled conservation potential.