| Primary Data Source | ✓ Real 5-Min Thermostat Data + Bills | Generic Estimates & Regional Averages | Blower Door + Visual Inspection |
| Fossil Blower vs. Hydronic Boiler Math | ✓ Separates ~500W Blowers vs ~100W Circulators | ✕ Generic Regional HVAC Assumption | Manual Inspector Estimate |
| Heat Pump Aux-Strip Setback Trap | ✓ Detects Exact 10kW Aux Recovery Spikes | ✕ Cannot See Thermostat Staging | ✕ Does Not Analyze Runtime Logs |
| Wood Stove & Space Heater Detection | ✓ Flags Zero-Runtime Thermal Anomalies | ✕ Blind to Supplemental Heating | Visual Only (No Bill Reconciliation) |
| Hardware Safety Guarantee | ✓ 100% Read-Only (Never Touches Setpoints) | N/A (No Hardware Connection) | N/A |
| Business Model / Privacy | ✓ Direct Homeowner Tool (Zero Lead Spam) | ✕ Sells Leads to Up to 4 Contractors | Upsells Weatherization Contracts |