Best Collections Software for HVAC Contractors in 2026

Disclosure: Abivo is our product. Facts about other tools come from their own websites as of October 2026.

The short answer: HVAC contractors usually have two AR problems at once: hundreds of small service and maintenance agreement invoices that nobody has time to chase, and a smaller number of large install, retrofit and progress billing invoices that need careful follow-up with general contractors and property managers. Field service platforms like ServiceTitan, BuildOps and Simpro handle invoicing and payment links well, and Simpro now sells an AR add-on called Fast Cash. If you want an AI agent that actually calls, texts and emails customers about overdue invoices and logs promises to pay, Abivo is built for that job and sits on top of your accounting system. Upflow and Versapay fit finance teams that want a broader AR platform with portals and payment tools.

Comparison table

Abivo

Abivo is AI collections software for B2B finance teams. Its AI agent, Kate, calls, texts and emails customers about overdue invoices in your company's name. Kate records promises to pay, disputes and next steps, and hands disputes and requests to speak with a person to your AR team with the full history attached.

For HVAC, the details matter. Reminders name the invoice details customers need to approve payment, such as the job, site, PO and billing period, which helps a property manager with many sites match the right repair. One message can cover every open invoice on an account, so a facilities customer with a dozen maintenance visits gets one clear follow-up instead of a dozen. You set the cadence per account or segment, pause any single invoice that is under review, and flag key accounts so a named owner handles them personally.

Abivo connects with QuickBooks, Xero, NetSuite, Sage Intacct, Microsoft Dynamics 365 Business Central, SAP and Chargebee, or works from an aging report export, which suits contractors whose FSM syncs into one of those ledgers. Multi-entity teams keep each subsidiary separate. Abivo does not replace your accounting system, invoicing, payment processing or cash application, so ServiceTitan, BuildOps or Simpro keep doing what they do. As proof in the trades, "OFS Group, a fire protection contractor, collected $842,518 in its first four months with Abivo" (case study).

For more on how this works in HVAC specifically, see our guide to collections software for HVAC contractors and how AI collections calls are handled.

Choose it when: you have more overdue invoices than people to chase them, your commercial customers need phone follow-up to get invoices approved, and you want to keep your FSM and accounting system as they are.

ServiceTitan

ServiceTitan's accounting page says it lets contractors "seamlessly manage your accounts receivable and know exactly where you stand," with real-time data on invoice aging, payment status and deposits. It supports moving payments between invoices, bulk application, refunds, and journal entry export to QuickBooks Online or Intacct. Its HVAC billing page describes field invoicing, online portal payments, and stored billing information for recurring membership payments.

On reminders, ServiceTitan's help center describes adding a Customer Portal link to Marketing Pro campaigns sent by email, text or direct mail, so customers can pay outstanding balances. The help article does not describe phone follow-up on overdue invoices.

Choose it when: you already run ServiceTitan, most of your customers are homeowners or small commercial accounts who pay through a portal or on-site, and you want AR visibility in the same system your dispatchers and techs use.

BuildOps

BuildOps describes itself as a platform for commercial contractors in HVAC, mechanical, electrical, plumbing, fire and life safety, and refrigeration. Its invoicing page says invoices can go out "the day the job closes," and its AI can "summarize who hasn't paid and suggest next actions." The payments page says every invoice email includes a Pay Now link for card or ACH, techs can collect in the field, and payments sync with QuickBooks, Intacct and NetSuite. The pages do not describe automated payment reminders.

Choose it when: you are a commercial HVAC or mechanical contractor on BuildOps and your biggest AR problem is billing speed and accuracy from the field, rather than repeated follow-up on aged invoices.

Simpro (with Fast Cash)

Simpro calls itself field service management software for trades that "quote, schedule and get paid faster." It supports payments in the office, in the field and through a customer portal, and exports invoices to QuickBooks, Xero and MYOB. Its Fast Cash add-on is described as "AI-powered accounts receivable management software." Fast Cash scores each customer into risk tiers using Simpro data, times outreach to each customer's likely payment behavior, stops contact once paid invoices are settled, and creates prioritized worklist tasks with history when automated outreach runs out. The page does not clearly list which outreach channels it uses.

Choose it when: you run Simpro, want AR follow-up inside the same vendor's system, and are comfortable with your staff making the harder calls from a prioritized worklist.

Upflow

Upflow describes itself as "the platform B2B finance teams need to collect smarter." Its collections page describes multi-step dunning sequences, "Smart Rules" that route customers by segment, and outreach by email, phone calls, SMS and postal letters, all logged on a customer timeline. It offers a branded payment portal with ACH, card and direct debit, plus a promise-to-pay option. Integrations include NetSuite, Sage Intacct, QuickBooks Online, Xero and Chargebee. Its listed industries lean toward SaaS, security and staffing rather than trades. Read our Upflow alternative comparison for more detail.

Choose it when: your HVAC company has a finance team that wants to design its own dunning sequences and payment portal and staff the calls itself.

Versapay

Versapay describes an AR automation platform covering invoicing through reconciliation, with automated follow-up, risk prioritization, a self-service portal where customers can pay or resolve disputes, ACH, card and wire payments, and AI cash application. It lists native connections to NetSuite, Sage Intacct and Microsoft Dynamics 365 and positions itself for midmarket finance teams. See our Versapay alternative page.

Choose it when: you are a larger multi-branch HVAC group on one of those ERPs and you want to replace invoice delivery, payments and cash application together.

How to choose collections software for an HVAC company

HVAC AR is unusual because one company often runs two businesses: high-volume service and a project-style install business. Use this checklist against your own aging report.

• Service agreement volume: Count how many open invoices are under a few hundred dollars. Maintenance visits create a long tail nobody calls. Ask whether the tool will follow up on every one of them, or only send emails.

• Consolidated follow-up: A property management company with many sites should get one message listing all open invoices, with site addresses, not one reminder per visit.

• Invoice details customers need: Commercial AP teams reject or park invoices missing a PO, work order number or service location. Check that reminders include those fields so the approver can match them.

• Install and retrofit billing: Progress billing, change orders and retainage on install jobs need a named person on the account. Make sure you can flag key accounts and keep automated outreach away from them, or pause a single invoice while a change order is negotiated.

• Disputes from the field: "The unit still isn't cooling" is a service issue, not a collections issue. The tool should log the dispute and route it to your team with the history, so a tech can be sent and the invoice paused. Our guide to resolving invoice disputes covers this.

• Promises to pay: Facilities managers often say "it's in the next check run." Record the date and follow up if it slips. See promise to pay tracking.

• Seasonality: Set a firmer cadence for aged service AR before summer and winter peaks.

• FSM and ledger fit: Confirm the tool reads from where your invoices end up, whether that is ServiceTitan synced to QuickBooks, BuildOps synced to Sage Intacct, or Simpro synced to Xero.

• Phone coverage: Commercial AP departments often respond to calls, not emails. Decide whether you want software that calls for you or one that gives your staff a call list.

Mechanical and electrical contractors with similar mixes can also read our roundup of the best collections software for mechanical and electrical contractors.

If you want to see how Abivo handles your own mix of service and install invoices, book a 30-minute demo on your own aging report.

Frequently Asked Questions

What is the best collections software for an HVAC company?

It depends on where your AR breaks down. If your FSM already invoices well but nobody follows up on overdue service and agreement invoices, an AI collections agent like Abivo adds the calls, texts and emails your team does not have time for. If you want everything inside your FSM, ServiceTitan, BuildOps and Simpro Fast Cash offer AR features within their platforms.

Does ServiceTitan have automated payment reminders?

ServiceTitan's help center describes adding a Customer Portal payment link to Marketing Pro campaigns sent by email, text or direct mail, and its accounting module shows invoice aging. It does not describe phone follow-up on overdue invoices in that article.

Can collections software work alongside ServiceTitan, BuildOps or Simpro?

Yes. Abivo connects with accounting systems such as QuickBooks, Xero, NetSuite, Sage Intacct and Business Central, or uses an aging report export, so it works with whichever FSM feeds that ledger. It does not replace your FSM, invoicing or payment processing.

How should HVAC contractors collect on small maintenance agreement invoices?

Group them. Send one message per customer covering every open invoice with the site, job and PO on each, set a steady cadence for that segment, and escalate to a person only when the customer disputes the work or asks to talk to someone.

Will an AI agent calling my commercial customers hurt relationships?

Not if you control it. With Abivo you set the cadence per account or segment, pause any invoice, flag key accounts for a named owner, and every dispute or request for a person goes to your AR team with the full history.