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Build a complete AC service case

The capstone project for AC Installation & Repair — a free Trades course. Pass it and you earn a certificate anyone can verify.

Start the course free Download the project workbook

The project unlocks once you complete the lessons. The workbook is free to download now so you can see exactly what is expected.

What you will submit

A shareable AC service-case document containing the diagnosis or install plan, the step-by-step process, the tools and materials list, a relevant safety section, and a clear naira customer quote.

What to do, step by step

  1. Choose ONE path: either (a) diagnose a real or sample AC fault, or (b) plan a full split-AC installation for a specific room. State clearly which you are doing and describe the unit (type, HP/BTU, refrigerant where relevant) and the situation.
  2. For a diagnosis: describe the customer's complaint and your logical step-by-step diagnostic process (free checks first, then the air/electrical/refrigerant reasoning), name the most likely fault and how you confirmed it, and lay out the exact repair steps. For an installation: describe the position choice for both units, and the full step-by-step install process including levelling, flaring, vacuuming and commissioning.
  3. List every tool and material the job needs (e.g. gauge manifold, vacuum pump, flaring tool, multimeter, coil cleaner, capacitor, gas, brackets, copper pipe) and note any parts to be replaced.
  4. Include a clear safety section relevant to your job: electrical isolation and capacitor discharge, plus refrigerant or fire precautions, and any stabiliser/wiring recommendation for the customer.
  5. Write a professional customer quote in naira that separates labour, parts/gas (with markup), and any call-out or materials, giving a clear total the customer can agree to before you start.
  6. Present it all as a tidy document or shareable link (Google Doc, PDF, Canva, or a clear typed note) that you could actually hand or send to a paying customer.

Files to work with

Project workbook (fill in, then submit)The whole brief, an evidence checklist, the grading rubric as a self-check and the link-sharing steps in one file. Opens in Word, Google Docs or WPS.Word · 6 KB

How it is graded

CriterionWeight
Diagnosis or install plan is correct, logical and follows the right order of steps30%
Tools, materials and repair/install steps are complete and realistic25%
Safety section correctly covers electrical and refrigerant/fire precautions20%
Naira quote is clear, fair and separates labour, parts/gas and call-out15%
Document is professional, clear and ready to share with a real customer10%

You need 65% overall to pass. A failed submission comes back with feedback and can be revised and resubmitted.

Before you submit: make your link public

If your work lives in Google Drive or Google Docs, open Share → General access and change “Restricted” to “Anyone with the link” (Viewer). Then paste the link into a private browser window: if it opens without sign-in, you are ready. A private link cannot be graded — it is the single most common reason a good project fails.

Frequently asked questions

Do I have to finish AC Installation & Repair before submitting the project?

Yes. The submission screen opens once every lesson in AC Installation & Repair is marked complete. The lessons are where the methods, the Nigerian context and the worked examples the project depends on are taught.

How is the project graded?

An examiner scores each rubric criterion from 0 to 100 and weights them as shown on this page; you need 65% overall to pass. Most submissions are graded within minutes and you get written feedback on what was strong and what to improve.

Can I resubmit if I fail?

Yes. A failed project comes back with feedback; revise the weak parts and resubmit. A passed project is final — the certificate is issued and cannot be re-rolled.

What do I actually submit?

A write-up of what you did (under 5,000 characters) plus a public link to your work — a Google Drive folder, Google Doc, spreadsheet, GitHub repository or video. The link must open without sign-in; a private link cannot be graded. The free project workbook on this page walks you through all 6 steps.

Is the certificate real?

Yes. Passing this project issues a certificate with a unique verification code. Anyone — an employer, a client, a school — can open the verification page and see that the certificate is genuine and which project earned it.

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Ready to earn this certificate?

AC Installation & Repair is free and self-paced. Finish the lessons, complete this project, and the certificate is yours to share.

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