Do I need commercial experience to start Path C?

No. The path assumes the shared foundation — electrical fundamentals, multimeter use and the refrigeration cycle — and then builds packaged-equipment judgment from there.

Are the RTU labs really free?

Yes. All four RTU decision labs are public and playable without an account. They use the same grading standard as the paid path.

Does this cover gas work authorisation?

No. The gas heat module teaches the ignition sequence diagnostically. Gas authorisations are issued by the authority in your jurisdiction.

How does Path C relate to Path D?

Path C is service and diagnostics on existing equipment. Path D covers installation, first start-up and commissioning of new equipment. Many technicians take both.

Path C

Commercial HVAC Systems — RTU focus

Rooftop units fail in patterns, not mysteries. This path teaches the sequence of operation as a diagnostic tool: prove the call, follow the sequence to the point it breaks, confirm the root cause and verify the fix with numbers before you leave the roof.

Interactive decision labs
Built by working technicians
Path-based verifiable certificate
Exam preparation only
Worldwide online

Play the free RTU no-cool lab Free RTU field guide Enrol in the full path

Who this is for

Residential technicians moving onto light commercial and rooftop work
Service technicians who can replace RTU parts but cannot always explain why the unit failed
Commercial maintenance staff responsible for packaged equipment on their own sites
Supervisors who need one repeatable RTU diagnostic standard across the crew

What you will be able to do

Read an RTU sequence of operation and use it to isolate the failure point
Diagnose an RTU no-cool call without condemning the compressor first
Prove whether an economizer is helping, idle or actively causing the complaint
Follow the gas heat ignition sequence from inducer to flame proving
Separate high static and airflow problems from refrigerant-side symptoms
Verify staging, safeties and controls before handing the unit back

Modules — each one ends in a lab

1RTU types and components
Live
Orientation walk-through
2Sequence of operation
Live
RTU no-cool decision labFree lab
3Economizers
Live
Economizer stuck decision labFree lab
4Gas heat sections
Live
Gas heat ignition decision labFree lab
5Fans, belts, VFDs, filters and static pressure
Live
High static / low airflow decision labFree lab
6Basic controls interfaces
Next
Controls verification lab
7Common RTU failure patterns
Planned
Mixed-fault lab

Four free RTU decision labs, playable now

RTU no-cool

A rooftop unit calling for cooling with nothing happening. Prove the call and the power before you touch the refrigerant side.

Play the lab

Economizer stuck

Mixed-air temperature that does not match the outdoor conditions. Decide whether the damper, actuator or control is at fault.

Play the lab

Gas heat ignition

No heat on a call. Follow inducer, pressure switch proving and ignitor operation in the order the sequence demands.

Play the lab

High static / low airflow

Numbers that look like a charge problem and are not. Measure static before you touch a gauge set.

Play the lab

Certificate

Certified Commercial HVAC Technician

On completion of the required modules and labs you receive a path-based, permanently verifiable EcoPowerHub Academy certificate. It confirms demonstrated RTU diagnostic competency and supplements, never replaces, any official credential required in your region.

Path-based, permanently verifiable diagnostic-competency certificate. It is a supplement to, not a replacement for, official credentials required in your region.

Certificate eligibility

To be eligible for the Certified Commercial HVAC Technician certificate you must complete the required modules and pass the required RTU decision labs.

Pass the RTU no-cool decision lab
Pass the economizer stuck decision lab
Pass the gas heat ignition decision lab
Pass the high static / low airflow decision lab
Complete the sequence-of-operation and RTU components modules

A lab is passed when the root cause is confirmed, the repair or decision is verified with readings, and no safety violation was recorded.

This certificate confirms demonstrated diagnostic competency inside EcoPowerHub Academy. It is not a statutory, gas-work or refrigerant-handling credential and does not replace EPA 608, SAQCC Gas, EPRA, ESSCI or any other credential required in your region.

Regional exam-prep notes

United States: Supports preparation for EPA 608 (Type II / Universal) and related NATE content. We do not issue the EPA or NATE credential.
South Africa: Aligns with safe-handling expectations under SAQCC Gas / SARACCA pathways. We prepare; SAQCC Gas issues the authorisation.
Kenya / East Africa: Supports good-servicing practice and RAC technician competence relevant to NITA / EPRA-adjacent work. Official authorisations remain with the relevant bodies.
India: Aligns with ESSCI RAC Service Technician (NSQF) and HPMP Good Servicing Practices orientation. ESSCI and the Ozone Cell issue official credentials.

Always verify current requirements with the authority in your jurisdiction.

Questions technicians ask

Do I need commercial experience to start Path C?: No. The path assumes the shared foundation — electrical fundamentals, multimeter use and the refrigeration cycle — and then builds packaged-equipment judgment from there.
Are the RTU labs really free?: Yes. All four RTU decision labs are public and playable without an account. They use the same grading standard as the paid path.
Does this cover gas work authorisation?: No. The gas heat module teaches the ignition sequence diagnostically. Gas authorisations are issued by the authority in your jurisdiction.
How does Path C relate to Path D?: Path C is service and diagnostics on existing equipment. Path D covers installation, first start-up and commissioning of new equipment. Many technicians take both.