ADP (Automatic Data Processing) has been the default payroll backbone for American businesses since 1949 and today supports more than 1.1 million clients worldwide. For HVAC contractors, ADP becomes compelling once complexity outgrows Gusto or QuickBooks Payroll - when a shop runs crews in multiple states, handles union or prevailing-wage work, manages 50+ employees, or wants a single vendor for payroll, benefits, 401(k), recruiting, and HR compliance. ADP RUN serves shops under 50 employees; Workforce Now is the go-to for mid-market contractors; and ADP TotalSource (PEO) co-employs staff for shops that want to outsource HR entirely.
ADP's strength for HVAC is breadth. Certified payroll and prevailing-wage scenarios are supported natively or through ADP Marketplace partners like Points North. Workers' comp pay-as-you-go programs eliminate large up-front premiums. Retirement plans, health benefits, and ancillary products all flow through one system. ADP Assist, the platform's AI layer, handles common questions and surfaces compliance alerts. The employee-facing mobile app is polished, with pay stubs, W-2s, benefits, and retirement balances all in one place.
The tradeoff is cost and sales friction. ADP pricing is quote-based, contracts can be long, and per-run fees often exceed flat-rate competitors. Integration with HVAC FSMs (ServiceTitan, FieldEdge, Housecall Pro) usually requires a middleware tool or manual CSV import. For HVAC shops that value breadth, compliance depth, and a single vendor across HR/payroll/benefits, ADP is often the right answer; for shops that just want fast, simple payroll, Gusto or QuickBooks is usually a cleaner fit.