This study validates a simplified steady-state heating degree-day (HDD) energy model against measured natural gas consumption from two
rural houses in Uzbekistan's Tashkent region during the 2014–2015 heating season: an energy-efficient pilot house (100 mm mineral wool insulation, heat-recovery ventilation) and an uninsulated typical house. Four basetemperature variants were tested. The model overestimates demand for the insulated house (HDD(20): MBE = +40.6%) and underestimates it for the uninsulated one (HDD(22): MBE = −20.8%), both due to occupant behavior undetectable by a steady-state model. Despite absolute errors of 28–32%, the pilot-to-typical energy ratio is reproduced with only 5.5% error (0.477 vs. 0.504), confirming the model's suitability for comparative building stock assessment and retrofit prioritization in rural Uzbekistan.