Define the condition
Record where and when the complaint appears, who observes it and what the building and equipment are doing at that time.
Field method and authority
Measure the building. Assign regulated work to the right party.
ICY uses a repeatable record for the complaint, operating state, observations, measurements, working explanation, assigned action and final comparison. Scientific principles are global; licenses, codes, permits and contractual responsibility are not.
Identify the systems
Name the relevant equipment, air paths, envelope surfaces, controls, exhausts, internal loads and parties with access or authority.
Record context
Time, weather, occupancy, door activity, setpoints and operating states travel with every reading.
Test a working explanation
Change one controlled condition where safe and authorized, then repeat the same measurement method.
Assign the action
The written scope identifies the owner, tenant, property manager, qualified trade or other party responsible for each approved step.
Verify the result
Repeat the agreed checks under the operating condition that created the complaint and preserve unresolved exceptions.
The building science behind the method
The science library keeps the mechanisms, measurement questions and limits together. Start with the relevant guide, then follow its references in the primary-source catalog. The catalog and scientific guides are separate from the trade-authority links below.
- Heat balance and cooling load
- Sensible and latent cooling
- Dew point and condensation
- Airflow and building pressure
- Temporary cooling and heat rejection
- Cooling capacity and efficiency
- Measurement and uncertainty
- Commissioning and verification
For the broader decision sequence, see lower-energy cooling, temporary cooling and the field-record method. Sources explain principles; they do not diagnose a site or authorize regulated work.
What this page does not do
It does not certify GCT, determine a license, diagnose a site, assign lease responsibility, approve a permit or supersede adopted code and manufacturer instructions. Verify the current authority immediately before contracting regulated work.