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Short answer: before buying accounts payable software for an HVAC or plumbing company, check six things: how supply house invoices reach one place, whether one invoice splits across jobs, how duplicates and statement copies are caught, who approves what, how coded bills reach QuickBooks, and which jobs belong to your field service software instead. A tool that answers all six for a flat monthly price fits most shops with five to forty trucks.
1. One inbox for every supply house and sub
Most late and lost bills in a service company never reach the person who pays them. A tech leaves a ticket on the dash, the owner forwards some PDFs and misses others. Ask any vendor how invoices arrive. The workable answer is one email address that suppliers can send to and the office can forward to, plus an upload for paper tickets someone photographs. If the tool needs each small sub to sign in to a portal, they will not do it and the keying comes back.
2. Splitting an invoice across jobs
A distributor invoice covers parts for a furnace replacement, two service calls and truck stock. Test whether coding happens at the line level, not only on the invoice total. If every invoice has to land on one job, job cost reports will be wrong the day you run them, and your bookkeeper will fix it by hand at month end, which is exactly the work you wanted to remove.
3. Duplicates, statements and reminders
Supply houses send the invoice, then a statement listing it, then a past due reminder. Any of them can be paid by someone in a hurry. Ask what the duplicate check actually compares. The useful checks are file content, vendor plus invoice number, and vendor plus amount plus date. A tool that only matches the invoice number will miss a re-issued bill with a new number and the same amount.
4. Approval that does not slow the shop down
You do not want to approve every box of fittings. You do want to see the $9,000 equipment invoice before it is paid. Look for a dollar threshold you set once, an approval log with name and time, and a way to approve without logging into a heavy dashboard. Per-branch routing trees are useful at fifty locations and a burden at one office.
5. Getting coded bills into QuickBooks
Most HVAC and plumbing companies under $20 million in revenue run QuickBooks Online or Desktop, and some run Xero or Sage. The tool should export an import file in the layout your accounting system expects, with vendor, bill number, dates, accounts, classes or jobs and line amounts. If the vendor says it has an integration, ask what happens to a bill that fails to sync and who sees the error. Our QuickBooks accounts payable automation page shows what the export contains.
6. What belongs to your field service software
Dispatch, scheduling, price book, technician apps and customer invoices are a separate purchase. AP software should not pretend to do them, and field service suites are usually weak at supplier invoice capture. Buying both and letting each do its own job is cleaner than a suite that handles both poorly. The same goes for payroll and for full construction job costing with committed cost and retainage, which larger commercial contractors keep in a construction accounting package.
What it should cost
Expect a published monthly price with an invoice allowance, not a quote after a demo. For a shop handling 150 to 300 invoices a month, a flat plan in the tens of dollars to low hundreds is realistic, while enterprise AP suites quote five figures a year and assume a controller to run them. Per-user pricing hurts when the owner, the office manager and a bookkeeper all need access. AutoPayables is $49 a month for 200 invoices and $149 for unlimited, with one price for the whole account. Compare any quote against what a person costs to key the same bills, using your own cost per invoice.
How to run a fair test
Take last month's supply house invoices, a statement that repeats some of them, and one invoice with mixed jobs. Process them in each tool you are considering. Count the minutes, check that the statement copies are flagged, that the mixed invoice is coded to the right jobs, and that the owner can see and approve the large bill. If a vendor will not let you test with real invoices, treat that as an answer. Once your payables are flowing cleanly into QuickBooks, the next job is usually the bank side, and turning a bank statement PDF into a QBO file for reconciliation takes minutes instead of hand entry.
Common mistakes contractors make when buying
The first is buying for the demo. A clean sample invoice from a national distributor reads fine in every tool. Your problem invoices are the handwritten ticket from a local pipe supplier, the scanned sub bill with a crooked photo and the statement that mixes credits with new charges. Test those. The second mistake is paying per seat. A shop where the owner, the office manager and an outside bookkeeper all touch bills ends up paying three times for one workflow. The third is skipping the export test. A tool that reads invoices beautifully but needs an hour of cleanup before the import file loads has moved the keying, not removed it.
The fourth is expecting AP software to fix job costing by itself. It will code what you tell it to code. If your jobs and classes in QuickBooks are inconsistent, clean those up first, because the software will faithfully send bad structure into your books at higher speed. Plan an hour with your bookkeeper to settle the list of jobs, classes and expense accounts before the first batch.
Questions to ask every vendor
Ask what the confidence score tells the reviewer, and whether low-confidence fields are highlighted. Ask how many invoices are included in the price and what happens at the 201st. Ask whether duplicate checks run before or after approval, whether a flagged duplicate can still be paid and by whom, and whether the approval log can be exported when a surety or lender asks. Ask how a credit memo from a supply house is handled, since credits are routine in this trade. Ask what happens to your data if you cancel. Straight answers, in writing, are worth more than a polished deck.
Who should not buy this
A one-truck operator with a dozen bills a month does not need AP software. A company that wants dispatch, billing and payables in one platform should shop for that suite. For service contractors where one person still types supplier invoices at month end, the details, including what is out of scope, are on the HVAC and plumbing contractor accounts payable automation page. Larger commercial builders can also read the construction version.
Stop keying invoices by hand
AutoPayables captures vendor, amounts and dates from any invoice with AI, applies spend-threshold approval, and keeps a full audit trail. Accounting sync pushes approved bills to your general ledger.
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