Why the installer matters as much as the equipment
The best heat pump on the market, installed incorrectly, underperforms for its entire service life. Refrigerant charge that is off by 10% can reduce system efficiency by 20%. Ductwork connected without proper sealing leaks conditioned air into your attic. A system installed without a permit means no inspection, no warranty protection, and a disclosure problem when you sell.
In San Diego County, where the HVAC market spans everything from large established companies to one-person crews working out of a pickup, knowing how to evaluate a contractor before you sign is the most important decision in the project.
Verify the C-20 license before anything else
Heating, Ventilation, Air Conditioning, and refrigeration work in California requires a C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor license. This is a state license issued by the Contractors State License Board (CSLB).
Verify any contractor’s license at cslb.ca.gov before signing anything. The CSLB lookup shows:
- Whether the license is active
- The license holder’s name and business name
- Whether the license covers the right classification (C-20)
- Whether the contractor has any disciplinary actions or complaints on record
Do not accept a license number from the contractor without verifying it yourself at cslb.ca.gov. A legitimate contractor will not hesitate when you mention you are checking the license.
Note: Heat Pro SD connects homeowners with experienced, insured local crews. The verification step above applies to any crew you hire, including those we refer.
Check workers’ compensation and liability insurance
Ask for a certificate of insurance showing general liability and workers’ compensation coverage. Both should be current (not expired). The liability policy protects your property if the crew damages something. Workers’ comp protects you if a worker is injured on your property.
In California, a contractor without workers’ comp is operating illegally if they have employees. If a crew shows up with multiple workers and the contractor claims not to have workers’ comp because “everyone is a sub,” that is a red flag worth probing. An uninsured worker injured on your property can create a liability situation for you.
Permits are not optional
Every heat pump installation in San Diego County and the incorporated cities requires a mechanical permit. Electrical work requires a separate electrical permit pulled by a licensed electrician. Some mini-split installations may only require the mechanical permit, but any time new circuits are run or a panel is modified, an electrical permit is required.
Signs a contractor is planning to skip the permit:
- They mention it will save time or money
- They say “inspectors don’t really check around here”
- The quote does not include permit fees
A permit protects you in three ways: the inspection confirms the installation meets code, it keeps your manufacturer warranty valid (most warranties require a permitted installation), and it shows up in the permit record, which matters at resale. Walk away from any installer offering to avoid permits.
Get at least two quotes
A single quote gives you a number with no context. Two quotes let you compare equipment specifications, scope of work, and price. Three quotes show you the market range and reveal outliers on both ends.
When comparing quotes, you are looking for:
- Specific equipment model numbers, not just brand and capacity
- Explicit statement that a Manual J load calculation will be performed
- Permit fees included in the quote
- Clarity on what happens to existing equipment (is refrigerant recovery included?)
- Warranty terms for both equipment and labor
Questions that separate good contractors from bad ones
“Will you pull a permit for this job?” The correct answer is yes, always. Any hesitation or redirection is a red flag.
“Can you walk me through your load calculation method?” A qualified contractor performs a Manual J load calculation to size the system. If they say sizing is based on what was there before or on square footage rules of thumb, they are not doing the calculation.
“What SEER2 and HSPF2 does this system carry?” If the contractor cannot answer this off the top of their head, they are not engaged with the efficiency specs of what they are proposing.
“What refrigerant does this system use?” R-410A has been the standard for years. New equipment is transitioning to R-32 and R-454B (A2L refrigerants) as part of EPA phasedown rules. Your contractor should know what refrigerant their equipment uses and have the certification to handle it.
“Are your technicians EPA 608 certified?” Refrigerant handling requires EPA 608 certification. This is a federal requirement, not optional.
Red flags to watch for
- Quote provided without seeing the home
- No mention of a load calculation
- Significantly lower price than all other quotes (usually means something is missing from scope or the crew lacks proper credentials)
- Pressure to sign immediately or deposit for a “limited time” price
- Cash-only payment with no written contract
- Vague contract language that does not specify equipment models, permit responsibility, or warranty terms
What a good contract includes
Before any work begins, you should have a written contract that specifies:
- The exact equipment model and specifications
- Total price, payment schedule, and what triggers each payment milestone
- Permit responsibility (the contractor pulls and pays for the permit)
- Project timeline
- Labor warranty (typically 1-2 years from a reputable installer)
- Equipment manufacturer warranty terms
- How the project handles unexpected conditions (e.g., if ductwork needs repair, what is the process for pricing that work?)
Heat Pro SD connects homeowners with insured, experienced C-20 HVAC crews throughout San Diego County. Visit the San Diego heat pump service area page or call (858) 925-5546 to get connected.
What license should a heat pump installer have in San Diego?
A C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor license issued by California’s CSLB. Verify any license at cslb.ca.gov before signing a contract.
How many quotes should I get for a heat pump installation?
At least two, preferably three. Quotes let you compare equipment specifications, scope, and price. A single quote gives you no context for whether the price and proposed system are appropriate.
What if a contractor offers to skip the permit to save money?
Walk away. A skipped permit means no inspection, no warranty protection, and a disclosure problem at resale. Every legitimate heat pump installation in San Diego County requires a mechanical permit.
Ready to get an estimate? See our heat pump services or call (858) 925-5546 to connect with an insured C-20 crew serving San Diego County.