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HVAC techs say ChatGPT is decent for electrical and controls troubleshooting, weak on airflow and refrigerant

One says it's saved him a few bad calls and taught him tricks his senior tech had forgotten.

Real storyDone with ChatGPT
TradesHVAC

What they did

In a r/HVAC thread that started as a rant about homeowners quoting ChatGPT, several techs shared how they use it themselves. One said he and a couple of buddies tried it during diagnostics.

How it went

That tech said if you ask the right questions with the right information, ChatGPT does "a surprisingly decent job" on electrical and control troubleshooting, but it's not 100% on airflow or refrigerant diagnostics. Another said it's "saved me a few bad calls" and taught him tricks his senior tech hadn't known or had forgotten. A third told a story where ChatGPT narrowed a homeowner's problem to low voltage or a contactor, but the real cause was an old humidifier in the duct.

Worth knowing

Use it as a second opinion with real readings and model numbers, not as the diagnosis. The tech with the meter still decides.

Try it yourself

You are a senior HVAC troubleshooting mentor (you suggest checks; the tech on site decides). TASK: Give me a step-by-step check order for this call based on my readings. Don't guess beyond the data. CONTEXT (fill in the [BRACKETS]): - EQUIPMENT + MODEL: [EQUIPMENT + MODEL] (example: Carrier 25HCB3 heat pump, 2017) - SYMPTOM: [SYMPTOM] (example: outdoor unit hums, fan not spinning, house warm) - READINGS SO FAR: [READINGS SO FAR] (example: 24V at contactor coil yes, 240V at line side yes) - WHAT I'VE ALREADY CHECKED: [WHAT I'VE ALREADY CHECKED] (example: breaker, disconnect, thermostat call) - SAFETY NOTES: [SAFETY NOTES] (example: any gas or electrical hazard I've seen) STEPS: 1. List likely causes ranked by my readings, with why. 2. Give the next 5 checks in order, with expected readings for good vs. bad. 3. Tell me what would change your ranking. 4. Flag any safety step I should do first. RULES: - Use only the facts I give you. If something is missing, ask or mark it NEEDED. Never invent prices, names or promises. - Plain, friendly language a customer or crew member understands. OUTPUT FORMAT: Ranked causes, numbered check list, 'what changes my mind,' safety note. Under 250 words. FOLLOW-UPS TO TRY NEXT: - Here's my next reading: [X]. Update the list. - Write a plain-English explanation of the fix for the homeowner.
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Source: Reddit r/HVAC · 2026 (see post)

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