Energize Denver HVAC upgrades: what building owners need to plan

Who Energize Denver covers

Energize Denver is the city's building performance policy. It applies to commercial and multifamily buildings in the City and County of Denver, including institutional, municipal and industrial buildings. Applicability follows ownership, not tenancy. Stand-alone parking garages are exempt, and the city has no jurisdiction over state or federal buildings.

The rules split by gross floor area:

New buildings join the large building program after 12 full calendar months of operation following a certificate of occupancy.

Key dates and what changed in 2025 and 2026

The April 2025 rules update and the September 1, 2026 ordinance and rules update (Technical Guidance version 4.0) changed the schedule, penalties and flexibility options. What matters most for planning:

• Owners who opted in during their 2025 benchmarking submission had the interim target moved to 2028, the 2027 interim target removed and the final target moved from 2030 to 2032. The city says 98.5% of large buildings earned that extension.
• Third-party data verification of one benchmarking report (2024 data submitted in 2025, or 2025 data submitted in 2026) is required by the end of the 2026 reporting year.
• No building is required to cut energy use by more than 42% from its baseline.
• Penalty rates for 25,000 sq ft and larger buildings were cut by 50%, and the city states that no performance penalties will be levied until late 2029.
• A 90-day cure period now sits between a notice of violation and an administrative citation.

Annual benchmarking is due June 1 for the prior calendar year, so 2026 data is due June 1, 2027.

Penalties, in plain numbers

Performance penalties equal kBtu not achieved multiplied by a rate that depends on the number of measurement periods. Rates are from Table 17 of the September 2026 Technical Guidance.

The city's own worked example: a 100,000 sq ft office that misses its target by 10 kBtu per sq ft has 1,000,000 kBtu not achieved. At $0.35 per kBtu, that is a $350,000 civil penalty. After a citation, owners who act within 150 days can apply to reinvest performance penalties into the building instead of paying the full amount to the city.

Where HVAC fits in a compliance plan

The city is explicit that Energize Denver is not an electrification mandate and does not require replacing heating or cooling equipment before the end of its service life. It is a whole-building EUI target that owners can reach with operations changes, efficiency upgrades or renewables. Heating, cooling, ventilation and controls usually account for a large share of a commercial building's energy use, so the mechanical plan is where most targets are won or lost. Measures that often pencil out first:

• Controls and scheduling that match real occupancy.
• Retro-commissioning: stuck dampers, simultaneous heating and cooling, failed sensors.
• Economizers that work: Denver's dry climate gives rooftop units many hours of outdoor-air cooling when the economizer is set up and maintained.
• Variable speed drives on fans and pumps.
• End of life replacement chosen for the EUI target, such as heat pump rooftop units, VRF or hybrid boiler plants, instead of like-for-like by default.

The electrification incentive

Buildings that reach 80% or higher on the percent electricity metric (the share of total site energy from electric sources) receive a 20% bonus on the final target. In the city's example, a final target of 50 EUI becomes 60 EUI. The September 2026 update boosted this credit, so heating electrification can make a target easier to reach as well as reduce emissions. It is checked annually, and dropping below 80% removes the bonus.

HVAC end of life and timeline extensions

If the most practical path to the target is replacing major equipment that still has useful life, the owner can apply for a timeline extension tied to end of system service life. The city publishes a service life chart (Appendix C of the Technical Guidance) built from ASHRAE data. Equipment must be at least 50% of the way through its listed life when the application is filed.

A timeline extension application needs an ASHRAE Level 2 energy audit following ASHRAE Standard 211, performed by a qualified third party not employed by the owner, plus a compliance plan of up to five pages and documentation of the reason. Near-term requirements are either implementing measures with a simple payback under 10 years or reducing energy use one third of the way to the final target. Other eligible reasons include capital planning cycles (extension to 2036, measured in 2037), utility service capacity constraints, buildings on the downtown district steam loop (through 2035, measured in 2036) and major renovations. A separate compliance hold of up to two years is available for financial distress, high vacancy, redevelopment areas and major lease expirations.

An extension does not require the equipment to be replaced. At the end, the city evaluates whether the building met its target, not whether the equipment changed.

Electrification rules at equipment replacement: read this carefully

Separate from Energize Denver performance targets, Denver's energy code includes partial electrification provisions that can apply when gas heating equipment in an existing commercial or multifamily building is replaced. This is the area where public information is least consistent, so we lay out what each source says:

• The city's Existing Commercial Building Projects page, based on the 2025 Denver Energy Code, says new or replacement gas-fired warm-air furnaces, unitary air conditioners or condensing units serving a heated space, and gas water heaters must comply with sections C503.3.3 or C503.4.1.
• The city's Electrification Feasibility Report page says that starting in 2025 electrification is required for gas furnaces, unitary AC and condensing units serving a heated space, and gas water heaters when the report shows it is cost-effective, defined as the electric option's net present value being no more than 15% above gas. It lists PTACs, VTACs and boilers for 2027. The same page says projects that qualify for a Quick Permit as a straight replacement are not subject to this step.
• The Energize Denver Technical Guidance states the performance policy itself is not an electrification requirement.
• In August 2026 a federal court dismissed an industry lawsuit challenging Denver's commercial building electrification rules. Local coverage reported that some later replacement standards, including electric boiler requirements, had not yet been written into the city's codes.

Our recommendation: before ordering replacement gas equipment for a commercial or multifamily building in Denver, confirm the current requirement with Denver Community Planning and Development at the permit stage, and price a heat pump option alongside the gas option so the decision is not made under a no-heat deadline.

State requirements and deemed compliance

Colorado has its own benchmarking and performance program for buildings 50,000 sq ft and larger, run by the Colorado Energy Office. Energize Denver was approved for deemed compliance in January 2026, so Denver buildings covered by both have one set of performance targets, and Energize Denver adjustments and extensions are recognized by the state. Owners must still submit annual benchmarking to both the city and the state, and the state's annual benchmarking and building decarbonization fees still apply.

A planning sequence that works

1. Pull your status. Confirm target, timeline and data verification status with the Energize Denver Help Desk.
2. Inventory equipment. Age, capacity, fuel and condition of every major unit against the service life chart.
3. Audit. An ASHRAE Level 2 audit if you expect to need an extension.
4. Check electrical capacity. Heat pump conversions often need service upgrades; Appendix E of the guidance has standard questions for Xcel Energy.
5. Price options side by side. Like-for-like, high efficiency and electric, with target impact.
6. Line up incentives. Some require preapproval before purchase.
7. Build, commission, verify. Documentation that supports the next benchmarking report.

Rebates and funding

As of October 14, 2026, Denver's Office of Climate Action lists rebates for ASHRAE Level 2 energy audits for covered buildings, Building Electrification Showcase grants for design and implementation, and an Energize Denver Compliance Assistance Gap Fund of up to $50,000 for qualifying buildings 25,000 sq ft and larger. City rebates can stack with Xcel Energy business rebates when equipment meets each program's rules, and some Xcel custom rebates require preapproval. Amounts are subject to change; confirm with the program before you buy equipment.

We survey mechanical systems, document equipment ages against the city's chart and price replacement options that move the EUI. See our commercial HVAC, rooftop unit replacement and boiler services, or a maintenance agreement to keep economizers and controls performing.