| FurnAddl | Additional Furnace |
| ElecBase | Electric Baseboard |
| EC | Evaporative Cooling |
| EvapDuct | Evaporative With Ducts |
| EvapNoDuct | Evaporative Without Ducts |
| FASDMZ | Forced Air, using Heating Ducts, Multi-Zoned |
| FAHDSZ | Forced Air, using Heating Ducts, Single Zone |
| FASDSZ | Forced Air, using Separate Ducts, Single Zone |
| FAR | Forced Air, without Returns |
| FARMZ | Forced Air, with Returns, Multi-Zoned |
| FARSZ | Forced Air, with Returns, Single Zone |
| HeatSame | Heating and Air Conditioning Same Ducts |
| HeatSeparate | Heating and Air Conditioning Separate Ducts |
| HeatPump | Heat Pump |
| HP | Heat Pump Cooling |
| HydMZ | Hydronic, Multi-Zoned |
| HydSZ | Hydronic, Single Zone |
| OT | Other |
| RadInFlr | Radiant In Floor |
| SpHeat | Space Heaters |
| HD | Using Heating Ducts |
| SD | Using Separate Ducts |
| FurnWall | Wall Furnace |
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