LOCAL LAW 97
NYC Local Law 97 and HVAC: what building owners actually owe, and how AirPulse helps.
Last verified 2026-07-17. LL97 caps and coefficients change on a schedule; check current NYC DOB rulemaking before relying on a specific number.
Local Law 97 puts a carbon cap on large NYC buildings and fines the ones that go over. Heating and cooling are usually the biggest controllable slice of a building's energy use, so cutting HVAC waste is one of the lower-cost ways to work toward staying under the cap. Here's who's covered, what the penalties are, where HVAC fits, exactly how AirPulse helps, and, just as important, what AirPulse does not do.
Who's covered
Local Law 97 covers most NYC buildings over 25,000 gross square feet, on the order of 50,000 buildings. They're the large buildings that together produce most of the city's building emissions, which is why the law targets them. Coverage is by size, not use: office, multifamily (R-2), retail, hotel, and mixed-use all fall in once they clear the threshold. Some buildings (rent-regulated, certain nonprofits and houses of worship) follow an alternative “prescriptive” path instead of the emissions cap.
The caps and penalties
Each covered building gets an annual emissions cap set by its occupancy type and floor area, in metric tons of CO2-equivalent per square foot per year. Go over the cap and the penalty is $268 per metric ton CO2e over, per year. The first compliance period runs 2024-2029; a sharply tighter set of caps runs 2030-2034 (the tightening pushes most buildings toward electrification and deep efficiency). Emissions are computed from metered energy using coefficients set in the NYC Administrative Code, for electricity 0.000288962 mtCO2e/kWh for 2024-2029 and approximately 0.000145 mtCO2e/kWh for 2030-2034 per current DOB rulemaking (the grid gets cleaner, so each kilowatt-hour saved counts for less carbon after 2030, but the caps tighten far faster).
| Compliance period | Electricity coefficient (mtCO2e/kWh) |
|---|---|
| 2024-2029 | 0.000288962 |
| 2030-2034 | ~0.000145 (per current DOB rulemaking) |
The honest part most vendors skip: the penalty applies only if your building is over its cap. In the 2024-2029 period, only about 9 to 11 percent of covered buildings are over, most owe nothing yet. That flips hard at 2030, when an estimated 57 percent of covered buildings are projected to exceed the tighter cap. So LL97 is best treated as a 2030 exposure you get ahead of now, not a bill most owners are paying this year. We will never tell you that you owe a penalty without seeing your actual emissions against your cap.
Where HVAC fits
Heating and cooling are typically the largest controllable slice of a building's energy use, commonly on the order of 35 to 45 percent (DOE/EIA), higher in older buildings with gas heat or electric resistance. Because emissions are computed straight from metered energy, that energy is also where most of the controllable carbon sits. That's why HVAC waste is the LL97 lever with the shortest payback: every kilowatt-hour of HVAC waste you remove is carbon you don't emit and, if you're over cap, a penalty dollar you don't pay.
How AirPulse helps LL97 compliance
- It targets waste you can attribute.Correcting the faults AirPulse flags (filter, airflow, refrigerant charge) recovers a documented 5-20% of a unit's energy (dirty filter 5-15%, U.S. DOE; low charge 10-20%, ACEEE). Because HVAC is typically 35-45% of a building's energy, cutting HVAC waste is on-site reduction exactly the kind LL97 rewards, and AirPulse documents it per unit so the recovery is measured, not assumed.
- It documents runtime and energy per unit, continuously. Every finding, repair, and recovery lands in a permanent per-unit record, the kind of evidence LL97 reporting and any efficiency claim needs.
- It gives you quarterly, compliance-friendly reports. Per-unit dollars, energy, and CO2 avoided in the exact mtCO2e units LL97 and corporate ESG reporting use, auto-generated, timestamped, and exportable. Measurement-grade, so your reporting professional has the operational records ready instead of reconstructing them from invoices at year-end.
The gas question: electrification is the durable LL97 lever
Trimming HVAC waste helps at the margin. The bigger LL97 move for a gas-heated building is getting off gas, and the math forces it:
- Gas doesn't get cleaner. The grid does. Under LL97, natural gas carries a fixed carbon coefficient (0.00005311 mtCO2e per kBtu) that does not decline. The electricity coefficient halves in 2030 (0.000288962 to 0.000143068 mtCO2e/kWh) as the grid decarbonizes. Every year on gas, your emissions stay flat while the cap tightens, so your penalty exposure rises.
- Electrifying zeroes the gas line. Replace gas heat and hot water with heat pumps and that entire gas-combustion emissions line goes to zero. The remaining electric load is scored against a coefficient that keeps falling.
- There's money to do it now.Con Ed's Clean Heat and building-electrification incentives pay to convert (see the buildings page), and your local AirPulse Pro files the paperwork. Once you electrify, AirPulse compounds on the larger electric load and documents the CO2 you avoid.
LL97 applies to existing buildings over 25,000 sqft. NYC's Local Law 154 and the NY State All-Electric Buildings Act ban gas in new construction only; they do not require an existing building to electrify. LL97 economics do the pushing. Coefficients per NYC Admin Code §28-320.3.1.1. Last verified 2026-07-17.
What AirPulse does NOT do
We're specific about our boundaries, because LL97 attracts a lot of overpromising:
- AirPulse does not issue or sell carbon offsets.
- AirPulse does not file or sign your LL97 compliance report.
- AirPulse does not replace a decarbonization consultant, energy auditor, or your registered design professional.
- AirPulse does not guarantee your building will be under its cap. What we do is remove HVAC waste and document it, which is one of the cheapest tons of carbon you can buy back.
The math (a worked example)
Take a 50-ton multifamily building running heat pumps year-round. Its cooling alone runs about 79,540 kWh a year (the $14,317 cooling portion of the year-round HVAC bill on the buildings page, at $0.18/kWh). Cut that cooling load by 15 percent and you save about 11,931 kWh a year. At the 2024-2029 electricity coefficient (0.000288962 mtCO2e/kWh) that's about 3.45 metric tons of CO2eavoided. If, and only if, the building is over its cap, that's about $924 a year in penalty you don't pay(3.45 mt × $268). This counts cooling only; a heat pump's winter heating is electric too, so the full year-round carbon recovery is larger, which makes this a conservative floor.
| What you avoid | Per year |
|---|---|
| Energy saved | 11,931 kWh |
| CO2e avoided (2024-2029 coefficient) | ~3.45 mtCO2e |
| Penalty avoided, only if the building is over its cap | ~$924 |
Illustrative, cooling-load basis, only applicable if the building is over its cap; about 57 percent of covered buildings are projected to be over the 2030 cap, when this lever matters most.
The bigger LL97 lever is the total electric reduction across the building, and HVAC is where most of the controllable waste sits, typically 35-45% of a building's energy (DOE/EIA). Correcting HVAC faults is the shortest-payback slice of that reduction. Your building's actual result depends on its own emissions and cap. The worked example above is the conservative, directly-attributable slice.
Carbon offsets, honestly
This is a question we get a lot, so here's the straight answer.
LL97 is not an offset program.To comply, a building has to actually reduce its own on-site emissions. You cannot buy your way under the cap with generic carbon offsets. The law allows two narrow, bounded forms of flexibility: a capped amount of renewable energy credits (RECs) deducted against electricity emissions only, and a GHG-offset allowance capped at 10 percent of the building's emissions limit (currently a narrow set of qualifying offsets). Neither is a substitute for real on-site reduction.
Offsets are a separate, voluntary market. If you want to generate and sell carbon offsets from real HVAC efficiency gains, that runs through third-party certification programs, Verra (VCS), Gold Standard, or the Climate Action Reserve, each with its own methodology, verification, and audit. That is a separate workflow AirPulse does not currently run.
What AirPulse actually provides here: the measurement layer. Continuous, per-unit, timestamped energy and runtime data, plus documented before-and-after recovery on every repair, is exactly the evidence an offset auditor or an LL97 filing needs. We produce the measurement layer that offset markets and compliance reporting require; the certification and filing are a separate workflow. We do not promise offset revenue and we do not quote carbon prices. Whether AirPulse builds an offset-certification pathway of its own is a roadmap question, not a current feature.
FAQ
Sources:NYC DOB, Local Law 97 of 2019, Covered Buildings List (nyc.gov/site/buildings/codes/ll97-buildings-emissions-limits.page); NYC Admin Code §28-320 and DOB rule 1 RCNY §103-14 (penalty $268/mtCO2e; electricity coefficient 0.000288962 mtCO2e/kWh 2024-2029, ~0.000145 mtCO2e/kWh 2030-2034 per current DOB rulemaking); over-cap shares from Urban Green Council LL97 analysis; HVAC energy share from U.S. DOE and EIA CBECS 2018; HVAC fault-recovery figures from U.S. DOE (Air Conditioner Maintenance: dirty filter 5-15% of an AC's energy) and Downey & Proctor, ACEEE 2002 (refrigerant charge 10-20% of unit efficiency). Last verified 2026-07-17.
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