Heart House
Office in Washington, DC, DC · 2400 N St. NW · 20037
At a glance
Heart House is a 178,293-square-foot office building at 2400 N St. NW in Washington, DC, built in 1983. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 79 out of 100 (grade B), a site energy-use intensity of 42.8 kBtu/ft² and 654 tCO₂e of greenhouse-gas emissions. That score is higher than 59% of the 774 scored office buildings in Washington, DC.
Clean and Affordable Energy Act / BEPS · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 79 (band B) |
| Site EUI | 42.8 kBtu/ft² |
| Source EUI | 115.4 kBtu/ft² |
| GHG emissions | 654 tCO₂e |
| GHG intensity | 3.7 kgCO₂e/ft² |
| Electricity | 2,101,671 kWh |
| Natural gas | 4,670 therms |
| Water use | 861 kgal |
| Gross floor area | 178,293 sq ft |
| Source record | dc:PM4562546:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 79 | +1 | 42.8 kBtu/ft² | 654 tCO₂e |
| 2023 | 78 | +9 | 43.3 kBtu/ft² | 678 tCO₂e |
| 2022 | 69 | -6 | 49.4 kBtu/ft² | 783 tCO₂e |
| 2021 | 75 | -4 | 39.0 kBtu/ft² | 646 tCO₂e |
| 2020 | 79 | +17 | 41.4 kBtu/ft² | 701 tCO₂e |
| 2019 | 62 | -11 | 66.7 kBtu/ft² | 1,115 tCO₂e |
| 2018 | 73 | +1 | 57.2 kBtu/ft² | 968 tCO₂e |
| 2017 | 72 | +5 | 72.0 kBtu/ft² | 1,411 tCO₂e |
| 2016 | 67 | -10 | 75.9 kBtu/ft² | 1,633 tCO₂e |
| 2015 | 77 | -5 | 66.6 kBtu/ft² | 2,043 tCO₂e |
| 2014 | 82 | 59.2 kBtu/ft² | 1,860 tCO₂e |
Compliance context
Clean and Affordable Energy Act / BEPS
DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
Ownership
AMERICAN COLLEGE OF CARDIOLOGY FOUNDATION
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Location
- Address
- 2400 N St. NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20037
- Coordinates
- 38.90699, -77.05198
Within ~1 km
Nearby benchmarked buildings
- BEPS1 - Foggy Bottom Campusscore —
Mixed Use Property · 5,533,789 sq ft
- Ross Hall Groupscore —
College/University · 1,047,627 sq ft
- Lafayette Centrescore 74
Office · 908,482 sq ft
Mixed Use Property · 844,878 sq ft
Office · 638,558 sq ft
- 2000 Lscore 76
Office · 612,295 sq ft
See also: most efficient in Washington, DC · biggest emitters
How does Heart House compare with other office buildings in Washington, DC?
The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. Heart House's ENERGY STAR score of 79 compares with an average of 70 across the 774 that report a score; it scores higher than 59% of them and lower than 37%. Its site EUI of 42.8 kBtu/ft² is about 23% below the average of 55.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 3.7 kgCO₂e/ft² is about 27% below the group average of 5.0 kgCO₂e/ft².
At 178,293 sq ft, it is about 18% below the average floor area of 216,135 sq ft for those buildings. It was built in 1983, 9 years later than the group's average year built (1974). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Heart House's energy performance changed over time?
BuildingCensus holds 11 Washington, DC disclosures for Heart House, covering report years 2014–2024. Its ENERGY STAR score went from 82 in 2014 to 79 in 2024 (-3 points); its best year on file was 2014, at 82. Site EUI moved from 59.2 kBtu/ft² (2014) to 42.8 kBtu/ft² (2024), a 28% decrease. Reported emissions went from 1,860 tCO₂e to 654 tCO₂e over the same span (down 65%).
What does an ENERGY STAR score of 79 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 79 means the building performs better than about 79% of its national peers. BuildingCensus bands the score into report-card grades; 79 falls in band B — above median (70–84). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In Washington, DC, 47% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Heart House's 42.8 kBtu/ft² across 178,293 sq ft works out to about 7.6 billion Btu (2,236 MWh-equivalent) in 2024. Its source EUI of 115.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,101,671 kWh of electricity, 4,670 therms of natural gas and 861 thousand gallons of water for the year.
Which law requires Heart House to report its energy use?
Heart House reports under the Clean and Affordable Energy Act / BEPS, the legal basis of Washington, DC's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record dc:PM4562546:2024). DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
More office buildings in Washington, DC
- 20 F Street· 178,148 sq ft · score 76 (B)
- Bond Building· 177,436 sq ft · score 100 (A)
- Bond· 177,436 sq ft · score 58 (C)
- 1156 Fifteenth, LLC· 177,404 sq ft · score 77 (B)
- 1775 Penn Ave· 176,979 sq ft · score 52 (D)
- 1250 Conn Ave· 176,882 sq ft · score 78 (B)
- Office buildings in Washington, DC· 899 benchmarked
- All Washington, DC benchmarked buildings· Clean and Affordable Energy Act / BEPS
- Most efficient large buildings in Washington, DC
- Least efficient large buildings in Washington, DC
- Biggest emitters in Washington, DC
Frequently asked questions
What is Heart House's energy grade?
Heart House scores 79 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Heart House use?
Its 2024 site energy-use intensity was 42.8 kBtu/ft² (115.4 kBtu/ft² source) across 178,293 sq ft, including 2,101,671 kWh of electricity and 4,670 therms of natural gas.
What are Heart House's carbon emissions?
Heart House reported 654 tCO₂e of greenhouse-gas emissions (3.7 kgCO₂e/ft²) for 2024.
Where is Heart House?
Heart House is at 2400 N St. NW, in Washington, DC 20037. Its coordinates are 38.90699, -77.05198 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Heart House and when was it built?
Heart House has 178,293 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1983 as its year built. It is classed as office.
Is Heart House covered by the Clean and Affordable Energy Act / BEPS?
Yes — it appears in the 2024 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Clean and Affordable Energy Act / BEPS.
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About this data
Source: Building Energy Benchmarking (Clean and Affordable Energy Act / BEPS), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Heart House, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/heart-house-9bf25acf (data as of July 9, 2026).