Technical guide

Build vs buy HVAC diagnostic knowledge

Building an OEM corpus in-house looks cheap until crawl drift, PDF versioning and liability land. Buying sourced lookup trades capex for metered API with citations.

Updated 30 August 2026

Hidden build costs

Manual versioning, regional SKUs, liability on wrong excerpts, and keeping embeddings fresh across 126+ brands.

Buy criteria

You need document_id + page citations in your CMMS/bot, abstention when unsure, and MCP or REST that your team can ship in weeks — see /api/docs/which-api.

Hybrid path

Developer tier for QA, pilot on one brand corridor, then Business quota — same endpoints, higher envelope.