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Summary of HVAC system types in U.S. schools based on the U.S. Energy Information Administration, Commercial Buildings Energy Consumption Survey
| School Type | HVAC System Type | Heating | Cooling |
|---|---|---|---|
| Primary School | Central-Forced-Air | 41% | 26% |
| Ductless with Air Filter | 47% | 63% | |
| Ductless without Air Filter | 12% | 10% | |
| Secondary School | Central-Forced-Air | 43% | 35% |
| Ductless with Air Filter | 41% | 54% | |
| Ductless without Air Filter | 16% | 11% |
