For years, building energy rules meant benchmarking — measure your consumption, report it, move on. That era is ending. Building Performance Standards (BPS) go a step further: they set hard limits on a building’s energy or emissions and impose real financial penalties for exceeding them. By 2026, more than 40 U.S. jurisdictions have active BPS, and enforcement has shifted from policy debate to penalty notices.
Most owners respond by focusing on the big-ticket items — boiler electrification, envelope upgrades, lighting retrofits. Those matter. But there’s a quieter contributor to your numbers that often goes unmeasured: after-hours HVAC. Conditioning floors outside business hours, frequently when they’re empty, adds to the energy and emissions counted against your cap — and because it’s so often untracked, it’s also a hole in the audit-ready data these laws now demand. This is the U.S. counterpart to documenting after-hours HVAC for NABERS in Australia and New Zealand.
What building performance standards are
A BPS is a law that requires buildings to meet a defined energy or emissions level — not merely report their consumption. The metric varies by jurisdiction: greenhouse-gas intensity in New York and Boston, site Energy Use Intensity (EUI) in Denver, Colorado and Washington State, and ENERGY STAR score in Washington, D.C. What they share is an enforcement trigger tied to performance, with penalties when a building misses its target — and limits that tighten over time on a path toward mid-century carbon goals.
The major standards at a glance
| Standard | Applies to | Metric | Penalty (current, approximate) |
| NYC Local Law 97 | Buildings over 25,000 sq ft | GHG intensity | ~$268 per metric ton over the cap; limits tighten sharply for the 2030 period |
| Boston BERDO 2.0 | Nonresidential 20,000+ sq ft | GHG intensity | ~$234 per metric ton, plus daily fines reaching ~$1,000/day for larger buildings |
| Washington, D.C. BEPS | 25,000+ sq ft (phasing down) | ENERGY STAR score | Up to ~$10 per sq ft |
| Seattle BEPS | 20,000–25,000+ sq ft | EUI / GHG | ~$10 per sq ft annually |
| Washington State CBPS | Commercial over 50,000 sq ft | EUI | First statewide BPS; Tier 1 deadline mid-2026 |
| Others (Denver, Chicago, Philadelphia, Montgomery County, Cambridge, Colorado, and more) | Varies | EUI / GHG | Varies — e.g. Philadelphia ~$300/day |
Thresholds, metrics, deadlines and penalties differ by jurisdiction and change frequently, so confirm the current requirements that apply to each of your buildings — this article is a starting orientation, not compliance advice.
Where after-hours HVAC fits the compliance picture
After-hours HVAC affects BPS compliance in two distinct ways, and both run in your favor if you manage them — or against you if you don’t.
It adds to the energy and emissions counted against your cap. Every hour the system runs out of hours consumes energy that lands in your annual EUI or emissions total, whether or not anyone benefited from it. When after-hours conditioning happens on a schedule rather than on demand, buildings routinely condition empty or near-empty floors — pure waste that still counts toward the limit you’re penalized for exceeding. The familiar “we’re paying for it anyway, leave it running” mindset is exactly the kind of waste that inflates a building’s intensity figure.
It’s a data and attribution problem. BPS compliance increasingly demands accurate, granular, often third-party-verified consumption data. Untracked after-hours runtime is a blind spot in that record — energy you can’t fully account for or attribute to the tenant who caused it. This matters more in jurisdictions like New York, where Local Law 88 has pushed large buildings toward submetering tenant spaces and upgrading lighting: after-hours tenant use is precisely the consumption you need to meter, attribute and document.
Two ways managing after-hours HVAC helps
1. Less wasted runtime, lower intensity. Running HVAC only when a tenant actually requests it removes the empty-floor conditioning that schedule-based operation leaves on. Our own analysis in The After-Hours Blind Spot found that an on-demand booking model cut average monthly after-hours HVAC electricity-use intensity by 48% — headroom that goes straight to your position under the cap.
2. The audit trail compliance requires. A booking system records every after-hours request: when, where, how long, and for which tenant. That timestamped, per-zone, per-tenant data feeds ENERGY STAR Portfolio Manager submissions, supports emissions calculations, and provides the verifiable trail that third-party verification and enforcement look for — turning after-hours HVAC from a reporting gap into documented evidence.
Why the margin keeps shrinking
The pressure is increasing on every axis. Caps tighten over time — New York’s 2030 limits step down dramatically — and analysis from JLL has found fines rising on average by over 80% between a building’s first and second compliance periods. ASHRAE Standard 90.1-2022 now calls for interval energy monitoring in buildings over 25,000 square feet across HVAC, lighting and plug loads, normalizing the kind of granular data BPS rely on. And investor-side frameworks like TCFD and ISSB are pushing the same verifiable-emissions expectations from the capital markets. The room for untracked, unattributed after-hours waste is closing.
Getting after-hours HVAC compliance-ready
A few moves align after-hours HVAC with your BPS obligations. Meter and attribute after-hours use rather than absorbing it into a building-wide total. Charge tenants for it, which both recovers cost and gives them a reason to stop wasting energy — the logic behind after-hours HVAC in a green lease, and a question of which billing method you choose. Keep auditable records of every request. And, most directly, condition space on demand instead of on a fixed schedule, so the system isn’t cooling an empty floor at 9 p.m. on your emissions budget. For the rate behind any tenant charge, see our cost benchmarks, and for the lease wording, our lease guide.
For the foundations of how after-hours HVAC works, start with our guide to what after-hours HVAC is.
Frequently Asked Questions
What are building performance standards? Building Performance Standards (BPS) are laws that require buildings to meet a defined energy or emissions limit — measured as GHG intensity, EUI or ENERGY STAR score — and impose financial penalties for exceeding it. Unlike benchmarking laws, which only require reporting, BPS enforce a performance level. Over 40 U.S. jurisdictions have active BPS as of 2026.
Does after-hours HVAC affect BPS compliance? Yes. Energy used to condition space outside business hours counts toward the EUI or emissions measured against your building’s cap, even when floors are empty. Untracked after-hours runtime both inflates that figure and leaves a gap in the audit-ready data compliance reporting requires.
Which cities have building performance standards? Major examples include New York (LL97), Boston (BERDO 2.0), Washington, D.C. (BEPS), Seattle, Denver, Chicago, Philadelphia and Montgomery County, plus Washington State’s statewide standard — with more jurisdictions adopting them each year. Thresholds and penalties vary, so confirm the rules for each building’s location.
How does tracking after-hours HVAC help with LL97 or BERDO? It does two things: it reduces wasted runtime on empty floors, lowering the intensity counted against your cap, and it produces timestamped, per-tenant records that feed Portfolio Manager submissions and provide the verifiable audit trail enforcement and third-party verification expect.
Is after-hours HVAC data needed for ESG reporting? Increasingly, yes. Investor frameworks like TCFD and ISSB and local BPS both demand verifiable, granular emissions data. Per-tenant, per-zone after-hours records support those disclosures rather than leaving an unexplained gap.
7NOX runs HVAC only when a tenant books it, cutting the empty-floor runtime that counts against your performance cap, and captures a complete, timestamped record of every after-hours request for your compliance reporting. See how it works.