How to Do Accounting for a Small HVAC Business: Sales, Purchases, and Profit Made Simple
Running a one-van HVAC shop means you're the technician in the morning and the bookkeeper at night. R-Pro gives you two powerful tools that share one workflow: a field app for AI fault diagnosis, scanning, and on-site receipts, and an office ERP for quotes, invoices, and full accounting. The work you do at a job site flows straight into your books, so sales, purchases, and profit add up by themselves.
Capture the money where the work happens
- Every dollar of your accounting starts at the job, so the field app lets you scan supplier receipts on site and auto-fill the item, amount, and supplier instead of keeping a shoebox of paper.
- Scan equipment nameplates to log exactly what you serviced, and attach the cost so a repair is tied to real revenue, not a guess later.
- Issue a receipt to the customer on the spot the moment the job is done, creating a clean record of the sale at the source.
- It all works fully offline, so a basement mechanical room with no signal never costs you a missing entry — the data syncs once you're back in range.
- Voice memos and per-customer service history mean nothing about a paid call gets forgotten before it reaches the books.
Keep proper books in the office ERP
- The office ERP separates your numbers the way real accounting needs them: sales (money in), purchases and expenses (money out), and net profit calculated as sales minus purchases minus expenses.
- Send quotes and estimates — including itemized construction quotes — then turn an accepted quote into an invoice or tax invoice without retyping anything.
- Set your OWN country's tax: name it VAT, GST, or sales tax and enter your own rate, so totals and tax invoices are correct wherever you operate.
- Track inventory, suppliers, and purchase orders so a part you bought shows up as a purchase and lowers your stock, keeping cost of goods honest.
- Use the customer ledger and reports to see who still owes you, what each month earned, and whether the business actually made money — not just stayed busy.
Field and office, one workflow — no double entry
- The job you finish on site flows automatically into the office books, so a completed repair becomes a recorded sale without you re-keying it at a desk.
- A scanned receipt in the field lands in the ERP as a purchase or expense, so the same data never gets entered twice and never goes missing.
- Because both halves share one record per customer and per job, your sales total, your purchase total, and your net profit always reconcile.
- Field and office are two equal tools under one subscription, available in 10 languages — strong on their own, far stronger run together.
- The result is real bookkeeping with the effort of a single tap on site, instead of a weekend lost to catching up the books.
Field and office, one workflow
R-Pro pairs an AI-powered field app with a full office ERP as two equal tools — diagnose and invoice on site, then watch sales, purchases, and profit add up in the books automatically. Try them together.
Get R-Pro →FAQ
Is R-Pro a field app or an office accounting program?
It's both, as two equal tools under one subscription. The field app handles AI fault diagnosis, scanning, voice memos, customer history, and on-site receipts; the office ERP handles quotes, invoices, accounting, inventory, and reports. They share one workflow, so field work flows into the books automatically.
Can I set my own country's tax for invoices and accounting?
Yes. You set the tax name and rate yourself — VAT, GST, or sales tax — so invoices, tax invoices, and your profit calculations are correct for wherever you do business.
Do I have to enter every sale and purchase twice?
No. A job you complete on site becomes a recorded sale in the office ERP, and a receipt you scan in the field becomes a purchase or expense. The data flows one way into the books, so there's no double entry and nothing slips through the cracks.
How does R-Pro calculate my net profit?
Net profit is sales minus purchases minus expenses. Because sales come from completed jobs and purchases come from scanned receipts and purchase orders, the totals reconcile on their own and the reports show whether you actually made money.