Commercial HVAC repair and replacement
The cheaper bid stopped being cheaper once the exclusions were added back.
HVAC is where owners are asked to make the most expensive judgement call with the least information: repair this, or replace it. The answer turns on whether a leak has actually been located, and that is a question most owners do not know to ask in those words.
It is also where competing bids are least comparable. Two quotes for the same equipment can differ by thousands on the cover page and by almost nothing once the exclusions are normalised.
What authorizes this work
A C-20 Warm-Air Heating, Ventilating and Air-Conditioning licence alone is legally sufficient for a split-system heat pump changeout, including refrigerant work.
This is a common misconception worth stating plainly: the C-20 / C-38 / C-43 stack is a capability signal — whether the contractor self-performs refrigeration and sheet metal or subcontracts them — not a licensing requirement. Do not let anyone tell you a single C-20 is inadequate for a standard changeout. Do check that the licence number appears on the bid document, which is required, and that the person signing appears on the licence.
Sonoma County · CSLB licence master
- 139 Sonoma County contractors hold a C-20 with no C-38 and no C-43.
- 33 hold C-20 plus C-43. 9 hold C-20 plus C-38.
- Exactly 1 holds the full C-20 + C-38 + C-43 stack.
A category example
What this looks like when it goes wrong.
Anonymised. No contractor is named and no finding of misconduct is made or implied — the point is the structure, which repeats across companies.
- The situation
- An ageing rooftop unit running a discontinued refrigerant stopped cooling at a commercial office building.
- The diagnosis
- The contractor found refrigerant escaping at a valve core, replaced the core and caps, and recharged the system. Asked directly whether the repair was worth making, the technician said he believed he had found the leak.
- The decision
- The owner authorised the repair and a full charge of discontinued refrigerant at a per-pound price typical for that product.
- What happened
- The system was empty again within about two weeks. Seventeen days after the recharge, the same contractor issued a replacement estimate — and that estimate's own scope proposed soldering both ends of the lineset and pressurising it to confirm whether the lineset was the leak. A full charge had been sold into a system whose leak had still not been located.
The check that would have caught it
The quantity is the tell. A full nameplate charge into a running system means the system was empty, not low. Ask whether the leak was confirmed or suspected, and get the answer in writing before authorising refrigerant at replacement-grade prices.
The lesson, and what it is not
A competing replacement bid on the same job came in roughly three thousand dollars higher on the cover page. It also included the permit, Title 24, and a longer labour warranty, all of which the lower bid excluded. Normalised, the two were close — and the apparently cheaper bid was arguably the more expensive one. An owner comparing headline numbers would have chosen wrongly and never known.
Before you authorize
Ask these, in this order, in writing.
None of these accuse anyone of anything. A contractor worth hiring answers all of them without difficulty, and the answers are what make two bids comparable.
- 01Has the leak been located, or is it suspected? Where specifically, and by what test method?
- 02What is the probability this recharge holds, and will the refrigerant be credited if it fails within a defined window?
- 03What quantity of refrigerant, at what price per pound, and is it a discontinued type?
- 04Repair cost against replacement cost, stated side by side before I authorise either.
- 05Does the quote include the mechanical permit, Title 24 compliance, electrical to the outdoor unit, lineset flush or replacement, detectors, disposal, and commissioning? List each as included or excluded.
- 06Exact equipment model numbers, and confirmation the indoor and outdoor units are a matched system.
- 07Labour warranty and manufacturer warranty, each stated in years, separately.
- 08What is the deposit, and what is the milestone schedule after it?
- 09Which entity is being billed, and does it match the entity that owns the equipment?
New analysis as it publishes.
Licence scope, code requirements, quote mechanics, and contract terms. Nothing else, and no vendor pitches.