Best for Invoicing and Crew Time Tracking
General-purpose (not HVAC-specific) tools with ongoing $0 plans, useful for a small shop before paying for full field service software.
| Tool | Category | Free tier / trial limits | Source | Last verified |
|---|---|---|---|---|
| Wave | Invoicing & accounting | Free plan (Starter, $0): unlimited estimates and invoices; card fees 2.9% + $0.60 per transaction | Official pricing page | 2026-10-22 |
| Connecteam | Crew scheduling & time clock | Small Business Plan free for up to 10 users | Official pricing page | 2026-10-22 |