Running HVAC Service Calls Where There's No Internet
A walk-in freezer in a sub-level kitchen, a rooftop unit behind concrete, a farm chiller an hour past the last cell tower: that's where your techs actually work, and that's exactly where cloud-only software goes blank. R-Pro is built the opposite way. The field app stores every job, scan, and receipt on the device first, so a dead signal never stops the work, and the data flows up to your office books the moment a connection comes back.
The field app keeps working with zero bars
- AI fault diagnosis runs on the device against 600+ real HVAC and refrigeration cases: enter the symptom, get likely causes and repair steps, no live server call needed in the basement or the field.
- Scan an equipment nameplate with the phone camera and the model, serial, and refrigerant fields auto-fill into the job, so techs stop hand-typing tiny stamped numbers in bad light.
- Scan a parts receipt the same way: the supplier, items, and total auto-fill and attach to the job instead of piling up in a glovebox.
- Add a voice memo while your hands are dirty, and pull up the full per-customer service history for that exact site before you touch a wrench.
- Issue a receipt to the customer on site, right at the truck, even with no signal at all.
Why most apps fail underground and out in the country
- Cloud-first tools read and write to a server on every tap, so a mechanical room, a metal-roof rooftop, or a rural call with no LTE leaves the app spinning or erroring out.
- Techs end up scribbling on paper 'to enter later,' and those notes get lost, smudged, or never make it into the office system.
- R-Pro saves to the phone's own storage first (IndexedDB), so the job, photos, scans, and receipt are safe on the device the instant you tap save, signal or not.
- Installed as a PWA, the app opens and runs without a browser connection, the same way a native app would.
- Nothing is queued in your memory or on a sticky note: it's already a real record the moment you finish the visit.
Back in range, the office ERP picks it up automatically
- When the phone reconnects, completed jobs sync up on their own, so there's no end-of-day data entry marathon waiting at the office.
- Field work flows straight into the office books with no double entry: a job's revenue, the receipt total, and the parts you scanned land in accounting (sales, purchases, expenses, net profit) automatically.
- Run the full back office from one subscription: quotes and estimates, invoices and tax invoices, inventory, suppliers, purchase orders, the customer ledger, and reports.
- Set your OWN country's tax name and rate on invoices, so the paperwork matches how you actually bill where you operate.
- The field app and the office ERP are two equal halves of one system, in 10 languages, so what your tech captures in a no-signal freezer is what your office invoices and your accountant sees.
One system for the field and the office, online or off
R-Pro pairs a fully offline FIELD APP (AI diagnosis, nameplate and receipt scanning, voice memos, per-customer history, on-site receipts) with a complete OFFICE ERP (quotes, invoices and tax invoices, accounting, inventory, suppliers, purchase orders, ledger, reports). Two equally powerful tools, one subscription, 10 languages: capture the job in a no-signal freezer and watch it flow into your books the moment you're back online. Try R-Pro at r-pro.app.
Get R-Pro →FAQ
Does the AI diagnosis really work with no internet?
Yes. The diagnosis is built on 600+ real HVAC and refrigeration cases and runs on the device, so you can enter a symptom and get likely causes and repair steps in a basement or a rural site with no signal.
What happens to a job if I never get a signal at the site?
Nothing is lost. The job, photos, nameplate and receipt scans, voice memos, and the on-site receipt are all saved to the phone's own storage the moment you tap save. They sync up to the office automatically the next time the device gets a connection.
Do I have to re-type field jobs into the office accounting later?
No. That's the point of having both tools in one system. A completed field job flows into the office ERP on its own: its revenue, receipt total, and scanned parts land in accounting with no double entry.
Can I set invoices to my own country's tax?
Yes. In the office ERP you set your own tax name and rate, so invoices and tax invoices match how you bill in your country. Both the field app and the ERP are available in 10 languages.