What AirCompDX is
AirCompDX is a field reference for air compressor and HVAC technicians: symptom-driven diagnostics, sizing and electrical calculators, controller fault codes and passwords, motor and refrigerant data, and job-site logs that turn into invoices. It is built around the way a call actually runs — symptom first, data second, paperwork last.
Works with no signal
Every calculator, diagnostic flow, and reference page is cached on your device after the first visit — basements, rooftops, and mechanical rooms included.
Written from real calls
Fault codes, controller menu paths, and service steps come from manufacturer documentation and time in front of the machines, not scraped filler.
No subscription
The reference core is free. Pro is a one-time $5 for a limited time — no renewals, no ads, ever. See what Pro unlocks.
Corrections and requests
Found a spec that's wrong, or need a controller or brand added? Send it over — data fixes from working techs get priority.
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