SR&ED Tax Credits for HVAC Manufacturers: When Product and Process Development Qualifies

Canadian HVAC manufacturers solve difficult airflow, acoustic, thermal, material and production problems every day. Some of that work may be more than ordinary engineering: it may qualify as scientific research and experimental development, commonly called SR&ED.

Key Takeaways

• A new or customized product is not automatically SR&ED. The project must pursue scientific or technological advancement through systematic experiment or analysis.
• HVAC projects can qualify when standard engineering knowledge cannot resolve a genuine uncertainty involving airflow, acoustics, heat transfer, durability, controls, materials or manufacturability.
• Eligible expenditures may include qualifying salaries or wages, prototype materials, contract SR&ED, certain equipment lease costs and, under the current rules, qualifying capital expenditures.
• Contemporaneous records are critical. Test data, failed iterations, design revisions, shop-floor records and reasonable labour allocations are often more persuasive than a narrative recreated after year-end.

Why HVAC Innovation Is Often Overlooked

Manufacturers do not always describe their work as research and development. The work may be called product engineering, customization, troubleshooting, prototyping, value engineering, commissioning or process improvement. Yet the label used internally does not decide SR&ED eligibility. The decisive question is what the team was trying to learn and how it tried to learn it.

For example, a manufacturer may need to reduce noise while preserving airflow through a compact silencer, prevent a backdraft damper from sticking across a demanding temperature range, or form a thin material without unacceptable distortion. If competent professionals could not determine the solution using the available technological knowledge, and the team tested hypotheses through a structured progression of trials, part of the work may qualify.

The Two Core Tests for SR&ED Eligibility

The Canada Revenue Agency (CRA) requires eligible work to be conducted in Canada and to meet two connected requirements: the work must seek a scientific or technological advancement, and it must use a systematic investigation or search carried out through experiment or analysis.

1. The project sought technological advancement

An advancement is not simply a better commercial product, a successful installation or a new feature. It is new technological knowledge generated because the existing knowledge base was insufficient to predict whether or how the desired result could be achieved. Incremental advancements can qualify; the project does not need to transform the industry.

2. The team tested hypotheses systematically

The work should move from a defined problem to one or more hypotheses, planned tests or analyses, observations, and logical conclusions. A failed result can still contribute eligible knowledge if it shows why an approach did not work and informs the next iteration. Trial and error alone is weak; a traceable experimental progression is much stronger.

Potential SR&ED Areas in HVAC Manufacturing

The examples below are not automatically eligible. They illustrate situations in which a technological uncertainty and a systematic experimental process may exist.

1. Acoustic attenuation under airflow constraints. A manufacturer may test internal geometry, perforation patterns, packing density, material combinations or chamber configurations to achieve a target sound reduction without causing unacceptable pressure drop, turbulence or size increases.
2. Air-control and backdraft performance. Work may involve uncertain interactions among blade geometry, sealing, bearing friction, orientation, temperature, condensation, fouling and low-pressure airflow. Eligibility is more plausible when established designs or calculations cannot reliably predict performance across the required operating envelope.
3. Material and structural behaviour. Prototype work may test flexible or rigid materials for fatigue, vibration, leakage, deformation, fire-performance constraints or repeated thermal cycling where supplier data and standard design practices do not resolve the application-specific limitation.
4. Manufacturing-process scale-up. A process that works for one prototype may fail at production scale. Systematic testing of forming sequences, tooling, fixturing, joining parameters, tolerances, coatings or curing conditions may qualify where the team is resolving a technological limitation rather than merely improving throughput.
5. Controls and integrated performance. Some projects combine mechanical components, sensors, control logic and variable operating conditions in ways that create uncertain system behaviour. Eligible work may include experiments used to understand and control those interactions; routine programming or commissioning remains outside the claim.

A Practical HVAC Example

Assume an HVAC manufacturer is developing a compact flexible silencer for a constrained installation. Existing design tables can estimate pressure loss and acoustic attenuation separately, but they do not reliably predict the coupled effect of flexible-wall behaviour, internal packing density and non-uniform airflow at the required dimensions.

Technological uncertainty

Could the team achieve the required attenuation across the target frequency range without exceeding the pressure-drop limit or causing deformation and performance drift during cyclic operation? The answer was not available from standard practice, supplier specifications or routine calculations.

Hypotheses and experiments

• Test whether a revised perforation pattern and packing density would reduce resonance while preserving open flow area.
• Compare internal support geometries under controlled airflow and repeated pressure cycles.
• Measure attenuation, pressure drop and deformation, then revise the design based on observed interactions rather than changing dimensions at random.

Advancement

The project may generate new knowledge about how the material, geometry and airflow interact within that constrained design envelope. The final product may succeed or fail; the knowledge gained through the experimental progression is what matters for SR&ED.

What Usually Does Not Qualify

A disciplined claim separates eligible experimental work from the broader commercial project. The CRA specifically excludes activities such as routine testing, market research, style changes and commercial production. In an HVAC environment, the following work is commonly outside the claim unless it directly supports eligible experimental development and is commensurate with its needs:

• Standard product sizing or configuration using established codes, formulas, catalogues or engineering practices.
• Routine CAD drafting, shop drawings, quoting, purchasing, installation and commissioning.
• Certification testing or quality control that merely confirms compliance with known requirements.
• Troubleshooting where the solution is available through ordinary diagnostic methods or known corrective action.
• Commercial production, including normal scrap, rework and production inefficiency unrelated to an eligible experiment.
• Customer preference changes, cosmetic redesign and market-driven feature selection.

What Expenditures Can a Manufacturer Claim?

Once eligible work is identified, the company must connect that work to allowable SR&ED expenditures. Depending on the facts and the expenditure method selected, potential categories include:

• Salary or wages for employees directly engaged in eligible work, including appropriate portions for engineers, designers, technicians, shop-floor supervisors, machine operators, welders or other personnel who performed qualifying tasks.
• Materials consumed or transformed during eligible experiments, such as prototype sheet metal, insulation, seals, fasteners, coatings and test components.
• Contract expenditures for SR&ED performed on the claimant’s behalf, subject to the applicable rules and reductions.
• Certain lease costs for equipment used in SR&ED and certain overhead expenditures, depending on whether the proxy or traditional method is used.
• Qualifying capital expenditures for depreciable property acquired after December 15, 2024, where the detailed SR&ED-use tests are met. Capital assets should be reviewed individually before inclusion.

How Valuable Can the Credit Be?

The federal basic investment tax credit rate is 15% of qualified SR&ED expenditures. Most Canadian-controlled private corporations may earn an enhanced, refundable 35% ITC on qualified expenditures up to their available expenditure limit. For tax years beginning after December 15, 2024, the maximum expenditure limit is $6 million, although corporate status, associated-company rules, taxable capital, refundability and other adjustments can change the result. Ontario research and development incentives may provide additional support.

The headline rate is not the same as the expected refund. A reliable estimate requires a project-level expenditure review and a calculation that accounts for assistance, contract payments, provincial credits and the corporation’s tax profile.

Documentation That Builds a Defensible Claim

The best evidence is created while the work is happening. Manufacturers usually have more documentation than they realize, but it may be scattered across engineering, production and finance. Useful records can include:

• Problem statements, design requirements and the technological limitation that standard practice could not resolve.
• Hypotheses, test plans, calculations, simulation outputs, test-rig configurations and acceptance criteria.
• CAD revisions, bills of materials, prototype travellers, batch records, machine settings and controlled process changes.
• Raw test data, photographs, inspection results, failure analyses, meeting notes and conclusions from each iteration.
• Time sheets, time-clock data, supervisor summaries or another reasonable and consistently applied labour-allocation method.
• Invoices, payroll records, purchase orders and material-usage evidence tied to the claimed work.

A clean record should explain not only what changed, but why it changed, what the team expected, what happened and what was learned. That sequence helps distinguish systematic experimentation from ordinary engineering iteration.

Do Not Wait Until the Filing Deadline

A corporation’s SR&ED reporting deadline is generally 12 months after its T2 filing due date, which is typically 18 months after the tax year-end. Missing the deadline generally means losing the claim for that year. The CRA recommends filing the claim with the corporate tax return rather than treating the extended deadline as the target.

For projects that have not yet started, the CRA also launched an optional pre-claim approval process on April 1, 2026. A complete application may result in an eligibility determination within eight weeks. This can be useful for material projects, but the company still needs to track eligible expenditures and preserve evidence.

How Stratos Helps HVAC and Advanced Manufacturers

Stratos Accounting & Consulting combines technical SR&ED analysis with the accounting needed to support the expenditure claim. Our recent manufacturing experience includes HVAC, plastics, aerospace and defence-related manufacturing. We help identify the true technological uncertainties, separate eligible work from routine engineering and production, quantify the related costs, prepare the technical and financial schedules, and support clients through CRA review.

If your team has spent the year building prototypes, resolving stubborn performance limitations or testing a process that could not be designed from established knowledge, it is worth having the work assessed. Contact Stratos for a consultation before the project history becomes harder to reconstruct.

Publishing note: Tax rules and administrative guidance can change. This draft reflects CRA information available on August 24, 2026 and should be reviewed before publication. Eligibility and credit amounts depend on the claimant’s facts.