# ICY AC

> A public, source-backed commercial building-science library operated by Gulf Coast Technologies, LLC.

ICY explains heat, moisture, airflow, cooling capacity, measurement uncertainty and commissioning in plain language. Educational pages do not diagnose a site, replace qualified trade or engineering authority, or assign contractual responsibility.

## Science library

- [Why a Building Stays Hot: A Heat-Balance Primer](https://icy.ac/science/heat-balance/): Follow heat entering, accumulating in and leaving a building before treating a hot-space complaint as an equipment-size decision.
- [Dew Point, Surface Temperature and Condensation](https://icy.ac/science/dew-point-condensation/): Understand why relative humidity alone cannot predict condensation and how moisture, air pathways and cold surfaces interact.
- [Sensible and Latent Cooling: Temperature Is Only Part of the Load](https://icy.ac/science/sensible-latent-cooling/): Separate temperature reduction from moisture removal when evaluating comfort, coil performance, runtime and ventilation load.
- [Airflow and Building Pressure: Follow the Complete Path](https://icy.ac/science/airflow-building-pressure/): Trace supply, return, outdoor air, exhaust and leakage as one mass-balance system instead of treating a door or grille symptom in isolation.
- [Temporary Cooling Works Only When Heat Leaves the Boundary](https://icy.ac/science/temporary-cooling-heat-rejection/): Evaluate the cold side, hot side, replacement air, condensate and electrical input before calling portable cooling a net building solution.
- [Cooling Capacity and Efficiency Are Different Questions](https://icy.ac/science/cooling-capacity-efficiency/): Read equipment ratings in context and separate heat-removal rate, electrical input, part-load behavior and installed delivery.
- [Measurement Uncertainty: Report What the Reading Can Support](https://icy.ac/science/measurement-uncertainty/): Define the measurand, preserve operating context and report instrument, sampling and calculation limits instead of false precision.
- [Commissioning and Verification: Prove the Intended Operation](https://icy.ac/science/commissioning-verification/): Turn requirements into functional tests, acceptance evidence, corrections and repeatable records across the operating modes that matter.

## Reference and use

- [Science hub](https://icy.ac/science/)
- [Glossary](https://icy.ac/science/glossary/)
- [Primary source catalog](https://icy.ac/science/sources/)
- [Blank field record](https://icy.ac/science/field-record/)
- [Editorial and correction policy](https://icy.ac/editorial-policy/)
- [Machine-readable library JSON](https://icy.ac/science/library.json)
- [Atom update feed](https://icy.ac/feed.xml)
- [Commercial problem guides](https://icy.ac/commercial-ac-problems/)
- [Service inquiries](https://icy.ac/service-areas/)

Linking and accurate citation are welcome. No open-content license is granted unless a specific asset says otherwise.