Guide
Heat loss inputs: measurements and assumptions
Heat loss outputs are only as reliable as the inputs and assumptions that sit behind them.
If a calculation can’t be explained, it can’t be trusted. The pack should make inputs and assumptions visible.
1) Measurements
- Measurements relevant to the agreed scope
- Room-by-room context where applicable
- Evidence where it helps clarify constraints
2) Assumptions
- Assumptions documented in plain language
- Constraints highlighted early
- Notes placed next to the evidence (where possible)
3) Handoff
- Installer-ready structure
- Designed to reduce follow-up questions
- Clear enough to explain to a homeowner