Evidence brief: climate-control assumptions and calculations
Which measurements and assumptions are needed before a mushroom-room climate record becomes actionable?
Scope of this review
Physical measurement and control design. The 800 m³/h result and dew-point table use assumed inputs and are independently reproducible, not observations from a Hamfy installation.
How we assessed the evidence
Sources checked on 5 October 2026. We compared university cultivation guidance, primary research and technical measurement literature. We distinguish published observations from Hamfy's proposed operating records and illustrative calculations; this is an editorial synthesis, not a systematic review or a farm trial.
What the evidence supports
The CO₂ balance is conditional
Steady state, source strength, supply concentration and mixing determine its applicability.
A sensor can become part of the problem
Condensation and position can bias the signal used for control.
Engineering and crop outcomes differ
Spatial uniformity, resource use and marketable yield need separate verification.
What this review does not establish
- No complete HVAC design, occupational exposure assessment or universal species target is provided.
- The cited room experiment is specific to Agaricus and does not validate every indoor mushroom configuration.
Hamfy’s proposed next step
Use the framework to define a monitoring brief with the grower: species, strain, crop stage, room layout, sensor locations and records needed to test a specific question.
Evidence to collect for a real project
- A named strain and supplier protocol.
- Timestamped room and substrate measurements linked to a batch.
- Comparable harvest, rejection and resource-use records across repeated cycles.
Source notes
- Research / technical guidance · 2006Environmental conditions within small-scale Agaricus bisporus mushroom production roomsSabeh et al. · Applied Engineering in Agriculture
Primary comparison of three air-distribution layouts, with limits on transferring the results.
- Research / technical guidance · 2019Measuring humidity in condensing environmentsVaisala · Joni Partanen
Manufacturer guidance about measurement errors and recovery in condensing environments.
- Research / technical guidance · 2025ASHRAE Position Document on Indoor Carbon DioxideASHRAE
2025 position document: limitations of CO₂-based ventilation inference, not a mushroom climate or safety standard.
- Research / technical guidance · n.d.Bacterial Blotch DiseasePenn State Extension
University explanation of surface wetness and bacterial blotch.