Quick answer
Start by checking a contractor through CSLB, comparing written scopes, and identifying the department that serves your address. Mr. Nailed It connects homeowners with independent contractors; it does not perform HVAC work.
Choose an HVAC contractor with a written, comparable proposal
A license lookup is an important first step, but it is not the whole hiring decision. Ask each contractor for a written scope that identifies the proposed work, equipment, payment terms, warranty information, permit responsibility, and the person who will communicate with the local authority.
| Item | What to ask or compare |
|---|---|
| License information | What CSLB license information should I use to look up this business? |
| Written scope | Which equipment, materials, labor, and related work are included? |
| Equipment details | Can you list the equipment model numbers and any stated efficiency information in the proposal? |
| Energy documentation | What California energy-standard documentation, if any, does the proposal identify? |
| Permit and inspections | Who will ask the local authority about permits, inspections, and project closeout? |
| Warranty | What workmanship and manufacturer warranty information is provided in writing? |
| Payment terms | What payments are listed, and what work or materials does each payment cover? |
Ask contractors directly how they address insurance, bonding, qualifications, and complaint history, and decide what documentation you want before signing. Keep the written proposal and any agency lookup results with your project records.
Verify the contractor through CSLB
The Contractors State License Board licenses and regulates California's construction industry to protect consumers. CSLB provides License Check and Find A Licensed Contractor tools.
- Ask for the license information associated with the business.
- Use CSLB License Check before signing an agreement.
- Confirm that the lookup details match the business you are considering.
- Ask CSLB about license details you do not understand.
Note: Do not rely only on a business card, proposal, or verbal assurance. Use the official CSLB lookup and compare its results with the business information on the written proposal.
Route your Los Angeles HVAC project to the right local authority
Los Angeles can mean the City of Los Angeles, an unincorporated area of Los Angeles County, or another incorporated city. Start by identifying the address jurisdiction, then ask that jurisdiction's building department which requirements apply to the proposed HVAC work.
- City of Los Angeles address: Contact the City department responsible for building permits and inspections for the property.
- Unincorporated Los Angeles County address: LA County Planning performs land-use planning functions for unincorporated areas of the county. Use the LA County Jurisdiction Lookup to check whether County Planning applies.
- Another incorporated city: Contact that city's building department or other responsible local authority.
Bring the proposed scope to the local authority: routine repair, equipment replacement, a new installation, ductwork, or rebuilding work may raise different questions. Ask what approvals, documents, inspections, or closeout steps the authority expects for your address.
Match the questions to the HVAC scope
| Project scope | Questions to ask |
|---|---|
| Routine repair | What is being repaired, what parts are included, and what warranty information is provided? |
| Equipment replacement | What equipment is proposed, what model numbers are listed, and what does the local authority require? |
| New installation | What work is included beyond the equipment, and who will communicate with the local authority about approvals and inspections? |
| Ductwork | Which ducts or related materials are included, and what documentation does the proposal identify? |
| Wildfire rebuilding | Does the contract follow the applicable disaster-related home improvement rules, and does the local authority identify any available rebuilding relief? |
Review current California energy-standard resources
The 2025 California Building Energy Efficiency Standards took effect January 1, 2026. The California Energy Commission provides the Energy Code Support Center, California Climate Zone Map, manufacturer-certified equipment information, and the Home Energy Rating System Program.
Ask each contractor what energy-standard information is identified in the written proposal. For project-specific direction, ask the building department serving the property.
Wildfire rebuilding: contract rules and fee relief
For rebuilding after a wildfire or another declared disaster, California treats the work as a home improvement project for contract and payment rules rather than new construction, according to CSLB.
- The contractor must use a fixed-price contract.
- Time-and-materials and cost-plus contracts are not allowed for this disaster-related home improvement work.
- The down payment cannot exceed $1,000 or 10% of the total contract price, whichever is less.
- Other payments must be clearly listed in the contract and reflect the actual value of completed work or materials delivered to the home.
LA County Planning states that fee waivers and refunds are available for property owners rebuilding after the Eaton and Palisades wildfires when they owned and lived on the property before January 7, 2025. Ask LA County Planning whether a specific rebuilding project or HVAC permit is covered and what current procedures apply.
Heads up: The disaster-rebuilding points summarize CSLB guidance and are not legal advice. Review current CSLB information and seek qualified advice for questions about a specific contract.
Helpful HVAC information for Los Angeles homeowners
For upkeep topics, read the HVAC Maintenance Guide – Los Angeles & Miami. Maintenance information does not replace project-specific guidance from a contractor or the local authority serving the property.
Frequently asked questions
How do I verify an HVAC contractor's California license?
Ask for the contractor's license information, then use CSLB's official License Check. Before signing an agreement, confirm that the lookup details match the business you are considering.
Should an HVAC contractor provide a written estimate?
Ask for a written proposal that identifies the scope, equipment, materials, payment terms, warranty information, and responsibility for local-authority communications. Compare the written details rather than verbal summaries.
Who should I contact about HVAC permits in Los Angeles?
First identify whether the property is in the City of Los Angeles, unincorporated Los Angeles County, or another incorporated city. For unincorporated county properties, use the LA County Jurisdiction Lookup. Then contact the authority serving the address about current requirements.
What California energy standards are current for HVAC work?
The 2025 Building Energy Efficiency Standards took effect January 1, 2026. Use California Energy Commission resources and ask the building department serving the property about project-specific requirements.
Should the contractor handle permits and inspections?
Ask who will communicate with the local authority, what documents the contractor will provide, and how inspections or project closeout will be handled. Get those responsibilities in the written proposal.
What should I do if I need HVAC repair quickly?
Request a written description of the proposed repair, the parts involved, payment terms, and warranty information. You can still use CSLB License Check and ask the local authority about any project-specific questions.