Table 1. Classification System for Identifying the Climate Control Potential for Buildings
| Category of Control | Classification Designation | Practical Limit of Climate Control | Systems Employed | Expected Benefit | Typical Construction Features | Typical Structure Types |
|---|---|---|---|---|---|---|
| Uncontrolled | I. | None | No Systems | None | Open Structure | Privy, stocks, bridge, sawmill, well |
| Uncontrolled | II. | Ventilation | Exhaust fans, open windows, supply fans, attic venting; no heat | Reduce summer temperature extremes; reduce moisture accumulation | Sheathed post and beam | Cabins, barns, sheds, silos, icehouse |
| Partial Control | III. | Heating, ventilation | Low level heating, summer exhaust ventilation, humidistatic heating winter control employed | Summer: same as II. Winter: good temperature control and limited humidity control; no winter occupancy |
Uninsulated masonry, framed and sided walls, single-glaxed windows. | Boat, train lighthouse, rough frame house, forge |
| Partial Control | IV. | Basic HVAC | Ducted low level heating; summer cooling, on/off control; DX cooling, some humidification; reheat capability | Reduction of all T&H extremes year-round; winter maximum indoor temperature 60 degrees F. | Heavy masonry or composite walls with plaster; tight construction; storm windows | Finished house, church, meeting house, store, inn |
| Climate Controlled | V. | Climate control with seasonal drift | Ducted heating; cooling, reheat and humidification with control dead band | Precision T&H control, but gradual season drift allowed | Insulated structures, double glazing, vapor retardant, double doors | Museums, research libraries, galleries, exhibits, storage rooms |
| Climate Controlled | VI. | Special constant Environments | Special heating, cooling, and humidity control systems with precision constraint stability control | Constant year-round T&H without drift | Metal wall construction, interior rooms with sealed walls and controlled occupancy | Vaults, storage rooms, cases |