Mini-Split Heat Pump Evaluation and Zero Energy Ready Home Support

Stacey Rothgeb, Anastasia Herk, Stacey Rothgeb (NREL Technical Monitor)

Research output: NRELSubcontract Report


IBACOS worked with builder Imagine Homes to evaluate the performance of an occupied new construction test house following construction of the house in the hot, humid climate of San Antonio, Texas. The project measures the effectiveness of a space conditioning strategy using a multihead mini-split heat pump (MSHP) system in a reduced-load home to achieve acceptable comfort levels (temperature and humidity) and energy performance. IBACOS collected long-term data and analyzed the energy consumption and comfort conditions of the occupied house after one year of operation. Although measured results indicate that the test system provides comfort both inside and outside the ASHRAE Standard 55-2010 range, the occupants of the house claimed both adequate comfort and appreciation of the ease of use and flexibility of the installed MSHP system. IBACOS also assisted the builder to evaluate design and specification changes necessary to comply with Zero Energy Ready Home, but the builder chose to not move forward with it because of concerns about the 'solar ready' requirements of the program.
Original languageAmerican English
Number of pages65
StatePublished - 2017

Bibliographical note

Work performed by IBACOS, Inc., Pittsburgh, Pennsylvania

NREL Publication Number

  • NREL/SR-5500-64855

Other Report Number

  • DOE/GO-102017-4749


  • Building America
  • heating, ventilation, and air conditioning (HVAC)
  • mini-split heat pump
  • occupant comfort
  • residential
  • residential buildings
  • zero energy ready home


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