HVAC Expert

AfterQuery; United States; Remote; USD 69,000 - 124,000; Full time

Job summary

AfterQuery is seeking licensed HVAC technicians to author and grade diagnosis scenarios used to evaluate frontier AI models. This is knowledge work performed remotely as an independent contractor.

You will write step-by-step reference answers with system reasoning, assess model outputs for accuracy and safety, and flag risky guidance. Flexible schedule with a minimum of 10 hours per week and weekly Stripe payments.

Qualifications

• EPA Section 608 certification and any required state HVAC license.
• 2+ years of field installation, service, or controls experience.
• Working knowledge of refrigeration cycles, airflow, and load calculations.
• Clear written English for documenting diagnostic reasoning.
• Able to commit at least 10 hours per week.

Responsibilities

• Author realistic HVAC scenarios from symptom through diagnosis and repair.
• Write reference answers with system and code reasoning behind each step.
• Grade model output for technical accuracy, efficiency, and safety.
• Flag advice that reads plausible but would harm equipment or vent CO into a home.

Skills

EPA 608 certification

State HVAC license

Field experience

Refrigeration knowledge

Written communication

Job description

Licensed HVAC technicians to build the diagnosis and system design scenarios frontier AI labs use to test model judgment on real trade work. AfterQuery builds the expert evaluation data that frontier AI labs use to measure and improve their models. We're hiring HVAC technicians as contractors to author and grade the diagnosis and system design scenarios those evaluations run on. This is knowledge work built on your trade, done entirely from home.

What you'll actually do

Author realistic HVAC scenarios from symptom through diagnosis and repair, the kind you actually run on a service call. Write reference answers with the system and code reasoning behind each step, why that charge, why that duct size, why that sequence of operations. Grade model output for technical accuracy, efficiency, and safety. Flag advice that reads plausible but would kill a compressor or vent CO into a home, the misses only a working tech would catch.

Who this is for

HVAC technicians with EPA 608 certification, any required state license, and at least two years of field work. Residential service, commercial refrigeration, and controls techs, all specialties welcome. Tradespeople who can explain the why behind the fix, not just the fix. People comfortable writing clearly, this work is typed, not brazed.

Contract and pay

$50 to $90/hr, paid weekly via Stripe. Your rate is set from your experience, not negotiated down after you start. Remote and async. No fixed hours, it fits around jobs. Minimum 10 hours per week, no maximum. Scale up or down week to week. No screen recording, no keystroke monitoring, no idle timers. Independent contractor. Ongoing project work rather than single task batches.

About AfterQuery

AfterQuery is an expert data lab. We build the evaluation and training data that frontier AI labs use to measure what their models can and cannot do in real professional work. Our contributors are practicing professionals, not annotators, and the work is credited, reviewed, and paid at professional rates.

Responsibilities

• Author realistic HVAC scenarios from symptom through diagnosis and repair
• Write reference answers with the system and code reasoning behind each step
• Grade model output for technical accuracy, efficiency, and safety
• Flag advice that reads plausible but would kill a compressor or vent CO into a home

Required Qualifications

• EPA Section 608 certification, plus a state HVAC license where your state requires one
• 2+ years of field experience in installation, service, or controls
• Working command of refrigeration cycles, airflow, and load calculation
• Clear written English for documenting diagnostic reasoning
• Able to commit at least 10 hours per week

Preferred Qualifications

• NATE certification or HVAC contractor license
• Commercial refrigeration or building automation depth
• Heat pump, geothermal, or high efficiency system experience

Why apply

• Paid for your trade knowledge, no tools, no travel, no job site
• Set your own hours and scale up or down week to week, it fits around jobs
• Weekly pay via Stripe at a rate set from your experience
• Your judgment shapes how the next generation of AI handles the trades