We compared a typical $250/mo answering service against usage-based AI answering across slow months and peak season for real shop call volumes.
Most answering services charge a flat monthly fee plus per-minute rates once you exceed a minute threshold. For a typical HVAC shop, that means paying $250–400 a month whether it’s a dead February or a record-breaking July heat wave.
With pay-per-call AI, you pay only for calls the AI actually handles. A slow February with 40 handled calls at $0.15/min might cost $30–50. A busy July with 300 calls might cost $200. But in July, those calls are booking jobs — so the AI is self-funding. In February, you’re not paying for capacity you don’t need.