Feasibility Study: Ductless Hydronic Distribution Systems with Fan Coil Delivery

Research output: NRELSubcontract Report


The primary objectives of this study are to estimate potential energy savings relative to conventional ducted air distribution, and to identify equipment requirements, costs, and barriers with a focus on ductless hydronic delivery systems that utilize water-to-air terminal units in each zone. Results indicate that annual heating and cooling energy use can be reduced by up to 27% assumingreplacement of the conventional 13 SEER heat pump and coil with a similarly rated air-to-water heat pump.
Original languageAmerican English
Number of pages33
StatePublished - 2012

Bibliographical note

Work performed by Alliance for Residential Building Innovation (ARBI), Davis, California

NREL Publication Number

  • NREL/SR-5500-55206

Other Report Number

  • DOE/GO-102012-3629


  • air to water heat pumps
  • ductless hydronic distribution
  • efficient space cooling
  • efficient space heating
  • low load homes
  • terminal fan coil


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