AC Maintenance Contracts, Unit Register and Service Visits

AC Maintenance Contracts, Unit Register and Service Visits is an offline app (one HTML file in a zip) for a small AC maintenance company or a freelance technician with annual maintenance contracts. You enter each site and its units, then each contract with the number of visits it includes. The app works out when each contract is due its next visit, lists the contracts that are overdue, books the visit in one press, and keeps the service history of every unit.

The problem it removes: An annual contract promises four visits a year, but nobody is told when a visit is due. Visits are missed until the customer complains, nobody can say when a given split unit was last cleaned, and the contract fee is chased from memory. This app turns the contract into a visit schedule and a due list you open each morning.

What is inside:

• Today page: contracts with an overdue visit, visits booked for today, contracts ending soon, unpaid contract fees and units not serviced for too long
• Contracts with start date, term, visits included, fee, payments and balance, and a calculated next visit due date and state (On track, Due soon, Overdue, Booked)
• Unit register per site: type, model, capacity, refrigerant, installed year, last service date and a service state for each unit
• One press Book due visits creates a visit for every contract that needs one, with Undo
• A visit lists the units serviced and the work done, and refuses a unit that belongs to another site
• Two active contracts for the same site on overlapping dates are refused
• Printable contract page with the unit list, and a visit report to sign at the site
• Example data you can load in one click, a Start here guide and an Honest limits panel
• JSON backup and restore, CSV export, and CSV import with a check of every row before anything is added

Who it is for: small AC maintenance companies, villa and building service contractors and freelance technicians who sell annual maintenance contracts with a set number of visits and look after tens or hundreds of units.

What it is NOT: It does not know any manufacturer service interval: the number of days before a unit shows as due is a setting you enter. It does not diagnose faults, track spare parts or stock, send reminders by itself, or take payments. The contract wording is sample text that you must replace with your own terms. It is not legal, tax or accounting advice, it is not connected to any government system, bank or messaging service, and it does not file or send anything by itself. UAE e-invoicing is not part of it.

Your data stays on this device in your browser. Back it up with Export; clearing browser data loses it otherwise.

Verified by us: scripted tests in Chromium (185 checks through the real screens: adding, editing and deleting records in every table, required-field messages, backup then clear then restore, CSV export then import, keyboard order, print layouts rendered to PDF, no horizontal scrolling at 375 and 1280 pixels, no network requests) and an independent recalculation by a separately written Python evaluator of 2056 calculated values (25 randomised rows plus the example data) with 0 mismatches. Safari engine (WebKit): smoke test passed; Firefox: could not be launched. Not tested: Firefox beyond what is stated here, and no real printer was used (print layouts were checked as PDF).