A retrofit's real return is rarely the energy savings alone. It is the energy savings plus the incentive stack — and most owners under-count the stack. The savings line is what vendors sell; the incentive line is what turns a marginal payback into a committee-ready one. This page lays out how to size both, and how to tell a benchmark-grade estimate from a number you can actually underwrite.
One framing rule first, borrowed from measurement-and-verification discipline: every figure below is benchmark-grade, not simulation-grade. It is good enough to decide whether a retrofit is worth a real feasibility study — and explicitly not a substitute for one. When you want a building-specific number, ask the agent to size your retrofit and incentive stack.
What goes into a retrofit incentive stack?
A defensible retrofit business case layers four sources of value. Owners who only model the first one consistently undervalue the project:
- Measured energy savings. The recurring line. To be underwritable it must be expressed as an IPMVP Option C (whole-facility) result with a baseline and an uncertainty band — not an "up to X%" ceiling.
- Federal tax incentives. In the US, the §179D commercial-buildings energy-efficiency deduction rewards qualifying envelope, lighting, and HVAC efficiency improvements. The deduction scales with measured efficiency gain and prevailing-wage compliance.
- Utility and state programs. Investor-owned utilities and state energy authorities (for example, NYSERDA in New York) run prescriptive and custom rebate programs for HVAC, controls, and fault-detection upgrades. These are real cash, but program-specific and time-bound.
- Avoided compliance penalties. Increasingly the largest line. In New York City, Local Law 97 sets building carbon caps with financial penalties for exceedance, tightening through 2030. A retrofit that moves a building under its cap converts a recurring penalty into avoided cost — which underwrites differently, and often more powerfully, than a rebate.
How big is the savings line, realistically?
AISB's working reference band for controls-and-optimization retrofits on commercial HVAC is roughly the Carrier Abound–class figure: about 28% energy reduction, on the order of $1.8M annualized on a large portfolio asset — used here as an upper-band reference, not a promise. The honest planning posture is to model a range, label it, and verify it:
| Input (your building) | Conservative | Reference (upper) band |
|---|---|---|
| Energy reduction (Option C, whole-facility) | 10–15% | ~28% (Abound-class reference) |
| Annual energy spend addressed | Your utility baseline | Your utility baseline |
| §179D federal deduction | Per qualifying scope + prevailing wage | Per qualifying scope + prevailing wage |
| Utility / state rebate | Prescriptive program rate | Custom program rate |
| Avoided LL97 (NYC) penalty | If currently over cap | If currently over cap (rises to 2030) |
| Typical blended simple payback | 3–6 years | Sub-12 months on best-fit assets |
The reason the payback range is so wide is the same reason most pilots disappoint: a portfolio average tells you nothing about your building. A 28% reference figure on a poorly-controlled, over-ventilated asset is plausible; on an already-tuned building it is not. That is why the savings line must be measured, not borrowed — the discipline that separates the retrofits that pay from the ones that stall, covered in why most CRE-AI pilots fail.
How do I label an estimate I can defend?
Use three tiers, and never let a higher tier wear a lower tier's confidence:
- Benchmark-grade — what this page produces. Range-based, sourced to named references, good for a go/no-go on feasibility. Decision: "is this worth a study?"
- Engineering-grade — a building-specific model with metered baseline and equipment audit. Decision: "what is the design and the budget?"
- M&V-grade — the post-install measured result under an IPMVP protocol with a reported uncertainty band. Decision: "did it actually deliver?"
An incentive stack underwritten on benchmark-grade numbers but presented as M&V-grade is exactly how a retrofit loses credibility at the capital committee. Keep the labels honest and the math survives review.
Size your stack
To get a building-specific capture range — savings band, applicable §179D scope, utility/state programs in your jurisdiction, and any avoided LL97 (or local-equivalent) penalty — ask the agent to size your retrofit and incentive stack. No login, no sales call. For the adjacent lease-economics view, see the lease-cycle ROI calculator.
Frequently asked questions
What is a retrofit incentive stack?
It is the combined value of a building retrofit: measured energy savings, federal tax incentives such as §179D, utility and state rebate programs, and avoided compliance penalties such as NYC Local Law 97. Modeling only the energy savings undervalues most projects.
How do I size a retrofit's payback?
Start with a benchmark-grade range (10–15% conservative to a ~28% reference upper band for controls retrofits), express it as IPMVP Option C whole-facility, then layer §179D, utility/state rebates, and any avoided carbon-cap penalty. Blended simple payback commonly lands in the 3–6 year range, and under 12 months on best-fit assets — but only a building-specific model is underwritable.
Is the savings estimate guaranteed?
No. Figures here are benchmark-grade — range-based and sourced to named references, suitable for a go/no-go feasibility decision. A guaranteed number requires an engineering model and a post-install M&V measurement with a reported uncertainty band.