The Best Offline HVAC App for Jobsites With No Signal
Half the jobs that pay the bills happen exactly where the signal dies — a basement plant room, a walk-in freezer, a rooftop unit on a remote site. R-Pro is built for that reality: a field app that does full AI fault diagnosis, nameplate scanning, and job records entirely offline, paired with an office ERP that turns every job into clean books. Two powerful tools, one workflow — field and office, together.
The field app that doesn't need bars
- Run AI fault diagnosis with zero signal — symptom to likely cause to repair steps, built on 600+ real HVAC and refrigeration cases stored on the device, not in the cloud.
- Scan equipment nameplates and receipts with the camera to auto-fill model, serial, and refrigerant details — no typing in a cramped, dark plant room.
- Capture voice memos hands-free while you work, and pull up that customer's full service history even when the building has no coverage.
- Issue a receipt to the customer on site and close the job out — everything is saved locally the moment you tap, and syncs later when you're back in range.
- No spinning loaders, no 'reconnecting' errors mid-diagnosis — the app behaves identically whether you have five bars or none.
The office ERP that turns jobs into books
- Build quotes and estimates — including itemized construction quotes — then convert them to invoices and tax invoices without re-keying anything.
- Run real accounting: sales, purchases, expenses, and net profit, so you always know what the month actually made.
- Track inventory, suppliers, purchase orders, and a per-customer ledger in one place instead of three spreadsheets.
- Set your OWN country's tax name and rate — VAT, GST, or sales tax — so invoices are correct wherever you operate.
- Pull reports that show the health of the business, not just a pile of completed jobs.
How field and office stay in sync
- Work offline all day in the field; the moment you're back on signal, the device syncs on its own — nothing is lost from the no-coverage hours.
- Completed jobs, receipts, and customer records flow straight into the office books — no double entry, no end-of-day re-typing.
- A receipt issued on site and the invoice in the ERP are the same record, so your accounting matches what the customer actually got.
- One subscription covers both tools in 10 languages, so the field tech and the office work from a single source of truth.
Built for the jobs where the signal dies
R-Pro gives you a field app that runs full diagnosis and job records offline, plus an office ERP for quotes, invoices, and accounting — two powerful tools, one workflow, so no-signal jobsites still flow straight into your books.
Get R-Pro →FAQ
Does the AI diagnosis really work with no internet at all?
Yes. The fault diagnosis, the 600+ case knowledge base, nameplate and receipt scanning, voice memos, customer history, and on-site receipts all run fully offline on the device. When you regain signal the app syncs in the background — nothing from the no-coverage period is lost.
Is R-Pro a field app or an office program?
Both, and they're equals. The field app handles offline diagnosis, scanning, and job records on site; the office ERP handles quotes, invoices, accounting, inventory, and suppliers. They're two powerful tools used together in one workflow — neither is an add-on to the other.
Can I set my own country's tax for invoices?
Yes. You define your own tax name and rate — VAT, GST, sales tax, whatever applies where you work — so quotes, invoices, and tax invoices are correct for your country.
What happens to a job I finished in a dead-signal basement?
It's saved on the device instantly when you complete it. Once the phone or tablet reconnects, that job — receipt, notes, customer record and all — syncs and flows into the office books automatically, with no double entry.