Building efficiency shapes energy demand, operating costs, emissions, comfort, and grid stress. The statistics below cover global and U.S. buildings, with survey years, definitions, participation limits, and modeled estimates kept explicit.
Key Building Efficiency Statistics
The most broadly useful building efficiency figures include:
- Buildings represented 30% of global final energy demand in 2022, or 34% when construction-material energy was included, for the global buildings sector.
- Global building energy intensity improved 3.5% from 2021 to 2022, measured per square meter across the global buildings sector.
- U.S. residential and commercial buildings accounted for about 40% of total U.S. energy consumption in a 2018-era Department of Energy estimate.
- Buildings accounted for nearly 75% of U.S. electricity use in the same 2018-era DOE sector estimate.
- U.S. building energy bills exceeded $400 billion annually in the 2018-era DOE estimate.
- The 2018 CBECS estimated 5.9 million U.S. commercial buildings within its in-scope commercial-building coverage.
- Those U.S. commercial buildings contained 96 billion square feet of floorspace in 2018, according to CBECS.
- U.S. commercial-building energy-use intensity fell 12% from 2012 to 2018, from 80,000 to 70,400 Btu per square foot.
- U.S. commercial-building electricity-use intensity decreased 14% from 2012 to 2018, measured per square foot.
- Average U.S. household site energy consumption was 76.8 million Btu in 2020, for occupied housing units.
- Air conditioning represented 19% of U.S. residential electricity consumption in 2020, according to RECS estimates.
- About 89% of U.S. homes used air conditioning in 2020, compared with 57% in 1980.
- Central air-conditioning prevalence reached 67% of U.S. homes in 2020, up from 27% in 1980.
- More than 330,000 buildings used ENERGY STAR Portfolio Manager in the latest program-year statistic on the source page.
- Consistent ENERGY STAR benchmarking was associated with average annual energy savings of 2.4% over the study period for participating buildings.
- ENERGY STAR-certified buildings used 35% less energy than typical U.S. buildings on average, according to the program statistic.
- More than 8,800 commercial buildings earned ENERGY STAR in the latest annual statistic, saving more than $2.2 billion.
- Fewer than 10% of buildings with onsite renewable systems used that generation for at least 75% of total electricity needs in the Portfolio Manager report period.
Contents
- Global building efficiency trends, targets, and cooling demand
- U.S. building energy-use scale and commercial stock
- Commercial building efficiency trends and end-use intensity
- Residential building efficiency and cooling statistics
- Benchmarking and ENERGY STAR performance data
- Retrofit, program, and onsite renewable outcomes
Global Building Efficiency Trends, Targets, and Cooling Demand
The Global Status Report for Buildings and Construction 2023 provides system-level context for the worldwide buildings sector. Its figures distinguish operational building energy from energy used to produce construction materials.
- In 2022, buildings accounted for 30% of global final energy demand. Including construction-material energy increased the share to 34%; these are different scopes, not interchangeable measures.
- Electricity’s share of buildings’ total final energy demand increased from 30% in 2010 to 35% in 2022. This describes the energy mix, rather than building efficiency or cooling alone.
- Global building energy intensity improved 3.5% from 2021 to 2022, measured as energy per square meter. The report attributes part of the improvement to building codes and building-fabric performance, but the aggregate change does not isolate one intervention or climate zone.
These global figures are estimates or system-level observations rather than a complete building-by-building dataset. They are useful for understanding scale and direction, while national surveys provide more detailed stock and end-use definitions.
U.S. Building Energy-Use Scale and Commercial Stock
The Department of Energy’s ABC Blog Series: New Technology to Retrofit America describes the size of the U.S. buildings opportunity. Its approximate sector estimates are not individual-building efficiency rates.
| U.S. buildings measure | Reported figure | Period and scope |
|---|---|---|
| Share of total energy | About 40% | 2018-era DOE estimate; residential and commercial buildings |
| Share of electricity | Nearly 75% | 2018-era DOE estimate; residential and commercial buildings |
| Annual energy bills | More than $400 billion | 2018-era DOE estimate; nominal dollars |
| Peak power demand | About 80% or more | FY2021 DOE estimate; aggregate system demand |
| Energy-related CO2 emissions | About 35% | FY2024 DOE estimate; DOE buildings-sector accounting |
| Estimated energy waste | About 30% of roughly $400 billion | FY2024 DOE estimate; broad waste concept |
Peak-demand share varies by season and region, and the waste estimate is not a measured loss rate for every building. These qualifications matter when applying national figures to a home, office, school, or retail property.
The 2018 CBECS Principal Building Activities estimates the size and energy use of the in-scope U.S. commercial stock:
- The survey estimated 5.9 million commercial buildings and 96 billion square feet of floorspace in 2018.
- U.S. commercial buildings used 6,787 trillion Btu of energy in 2018. CBECS consumption is estimated from survey and supplier data, not from a meter census.
- Warehouse/storage, office, and service buildings together made up 48% of commercial buildings in 2018.
- Office, mercantile, and education buildings accounted for 43% of commercial-building energy consumption.
CBECS is a statistically representative national survey of in-scope commercial buildings for its reference year. It does not cover residential, manufacturing, agricultural, or industrial buildings.
Commercial Building Efficiency Trends and End-Use Intensity
The EIA commercial buildings analysis compares CBECS survey cycles. Energy intensity means energy per square foot, so changes can reflect weather and building-stock composition as well as efficiency actions.
| Commercial-building measure | 2012–2018 result | Geography and unit |
|---|---|---|
| Gross energy-use intensity | Down 12%, from 80,000 to 70,400 | U.S.; Btu per square foot |
| Electricity-use intensity | Down 14% | U.S.; percent change per square foot |
| Natural-gas-use intensity | Down 11% | U.S.; percent change per square foot |
| Largest building-type decrease | Inpatient healthcare, down 16% | U.S.; 2012–2018 comparison |
The largest decrease among the displayed building types was the 16% decline for inpatient healthcare buildings. This is a CBECS comparison, not a controlled retrofit trial or a claim about every healthcare facility.
The 2018 CBECS activity data also show why building type matters:
- Food-service buildings had the highest reported cooling energy intensity at 19.1 MBtu per square foot.
- Inpatient healthcare buildings had space-heating intensity of 62.6 MBtu per square foot, the highest end-use intensity among the displayed categories.
- Inpatient healthcare buildings had ventilation intensity of 28.6 MBtu per square foot.
- The average U.S. commercial building was 16,300 square feet in 2018; the average is not a median.
- Lodging buildings averaged 33,700 square feet, while food-service buildings averaged 4,800 square feet.
Cooling, heating, and ventilation figures are CBECS end-use estimates modeled from engineering inputs and survey data. Category averages should not be generalized to every property.
Residential Building Efficiency and Cooling Statistics
The 2020 RECS heating and end-use estimates describe occupied U.S. housing units using survey-based modeling. They measure site energy and fuel-specific end uses, which should not be mixed without preserving the denominator.
- Average U.S. household site energy consumption was 76.8 million Btu per household in 2020.
- Average household energy expenditures were $1.04 per square foot in 2020.
- Air conditioning represented 19% of residential electricity consumption, while space heating and water heating each represented 12% of residential electricity consumption.
- Among households using natural gas, space heating represented 68% of residential natural-gas consumption, and water heating represented 25%.
- Space heating represented 70% of residential propane consumption and 80% of residential fuel-oil consumption in 2020.
The EIA electricity-use-in-homes data show long-term cooling adoption, not equipment efficiency:
| Residential cooling measure | 1980 | 2020 |
|---|---|---|
| Homes using air conditioning | 57% | About 89% |
| Homes with central air conditioning | 27% | 67% |
About 99% of U.S. homes had a refrigerator in 2020, and 34% had two or more refrigerators. The average operating cost of the most-used refrigerator was about $87 per year, compared with about $66 for a second refrigerator; these are 2020 estimates, not efficiency ratings.
Building Benchmarking and ENERGY STAR Performance Data
ENERGY STAR participation measures are important indicators of benchmarking adoption, but they describe voluntary or policy-driven participants rather than the entire building stock. The ENERGY STAR Facts and Stats page reports more than 330,000 buildings using Portfolio Manager, representing nearly 25% of U.S. commercial-building floorspace.
The ENERGY STAR DataTrends research covered 35,000 buildings over three years. Buildings that benchmarked consistently saved an average of 2.4% of energy per year, an association from a voluntary dataset rather than a randomized retrofit trial.
The ENERGY STAR building-certification framework uses a relative score:
- A score of 75 or higher places an eligible building in at least the top 25% of similar buildings nationwide.
- ENERGY STAR-certified buildings use 35% less energy than typical buildings nationwide on average.
- Certified office buildings generate 35% fewer emissions than peers and cost $0.54 less per square foot to operate on average.
The score accounts for operating conditions and weather and is not a universal kilowatt-hour threshold. Peer comparisons also vary with energy prices, building operations, and emissions-accounting definitions.
Retrofit, Program, and Onsite Renewable Outcomes
Program-reported outcomes quantify savings among participating organizations. The ENERGY STAR Facts and Stats page reports that more than 8,800 commercial buildings earned ENERGY STAR in the latest annual statistic, saving more than $2.2 billion.
Since 1992, more than 43,000 commercial buildings had earned ENERGY STAR, representing over 6.5 billion square feet. The cumulative count can include repeat annual certifications and does not necessarily equal unique buildings in every context.
The same ENERGY STAR program reports the following latest annual and cumulative outcomes:
- Commercial and industrial participants avoided $14 billion in energy costs, 230 billion kWh of electricity, and 170 million metric tons of emissions in the latest annual statistic.
- Since 1992, the program helped avoid nearly $200 billion in energy costs and nearly 2.7 billion metric tons of emissions.
These are EPA program-attributed estimates, not national building-sector totals. Their emissions results depend on conversion factors and program-accounting assumptions.
The ENERGY STAR onsite-renewable report adds adoption and coverage context:
| Onsite-renewable measure | Reported result | Scope |
|---|---|---|
| Buildings reporting onsite renewables | Nearly 1% | Portfolio Manager benchmarking buildings |
| Highest category concentration | 2.4% | K–12 schools and worship facilities |
| Buildings using onsite generation for at least 75% of needs | Fewer than 10% | Buildings with onsite renewables |
| Onsite generation meeting electricity needs | Over 50% in warehouse/storage; 7% in hospitals | Portfolio Manager categories |
| Buildings retaining renewable-energy certificates | 60% | Included building types |
The source-energy conversion factor shown for grid electricity is 2.80, compared with 1.0 for onsite renewable energy. These are accounting conventions affecting source energy use intensity and score interpretation, not changes in physical site consumption.