Replacing or altering an HVAC system in California is an alteration under the Energy Code. Depending on scope, it can trigger requirements such as duct sealing and leakage testing, and field verification by a third-party rater. Many changeouts use prescriptive forms rather than a full model.
Projects we cover
What’s included
- Scope assessment
- Prescriptive or performance documentation
- Field verification list
Does a like-for-like AC replacement need Title 24?
Alterations to space-conditioning systems generally carry Energy Code requirements, often handled with prescriptive alteration forms and field verification.
Which compliance forms are used?
Residential alterations use CF1R alteration forms; nonresidential use NRCC-MCH.
What documents do I need?
- Existing and new equipment details
- Duct scope
- Home size and year built
Missing something? Order anyway — we’ll flag gaps and, where appropriate, use code-minimum assumptions with your approval.
How we prepare your report
- 01Plan & data intake
We review your plans for completeness — floor plans, elevations, sections, window schedule and mechanical notes — and flag anything missing before modeling starts.
- 02Climate zone & scope confirmation
We confirm the project’s climate zone from the site address using the CEC lookup, and the compliance scope (new construction, addition, alteration).
- 03Energy modeling
The building is modeled in CEC-approved compliance software, choosing the performance or prescriptive path that best fits your design.
- 04Technical review
Inputs are checked against the plans: areas, orientations, assemblies, fenestration, HVAC and water heating, PV and battery requirements.
- 05Delivery & revisions
You receive the signed compliance documents as PDF, ready to print onto the plan set, with included revisions for plan-check comments.
Frequently asked questions
Who does duct testing?
Field verification is performed by a certified third-party rater, scheduled by your contractor.