Imagine Homes New Construction Occupied Test House

Research output: NRELSubcontract Report


This report summarizes the research findings of a long-term monitoring plan to evaluate the performance of an energy-efficient home constructed in 2010 in San Antonio, Texas. Monitoring of the energy use, energy generation, and temperature conditions for this project occurred between July 2010 and October 2011. The heating, ventilation, and air conditioning system effectively maintainedacceptable temperatures and humidity levels in peak cooling and heating and non-peak operating periods. Discrepancies were found between modeled and actual energy use values, with actual space cooling energy use closest to the corresponding modeled value. Energy consumption predicted for lighting, appliances, and miscellaneous electrical loads was significantly higher than measured amounts, andenergy consumption predicted for cooling was significantly lower than measured amounts. A high amount of the 1,600 kWh of PV-generated electricity produced annually was sent to the electric grid every month. The solar thermal DHW system was the main source of hot water for most of the year and performed well; during summer, electrical use by the backup system was rare.
Original languageAmerican English
Number of pages45
StatePublished - 2013

Bibliographical note

Work performed by IBACOS, Pittsburgh, Pennsylvania

NREL Publication Number

  • NREL/SR-5500-58084

Other Report Number

  • DOE/GO-102013-3911


  • ACH
  • actual meteorological year
  • AFUE
  • AHU
  • air changes per hour
  • air handler units
  • annual fuel utilization efficiency
  • BA
  • BEopt building energy optimization software
  • Building America
  • building energy optimization
  • heating, ventilation, and air conditioning (HVAC)
  • house simulation protocol (HSP)
  • HSP
  • HVAC
  • lighting, appliances, and miscellaneous electric loads
  • null
  • residential
  • residential


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