Long-Term Monitoring of Mini-Split Ductless Heat Pumps in the Northeast

Stacey Rothgeb, K. Ueno, H. Loomis, Stacey Rothgeb (NREL Technical Monitor)

Research output: NRELSubcontract Report


Transformations, Inc. has extensive experience building their high performance housing at a variety of Massachusetts locations, in both a production and custom home setting. The majority of their construction uses mini-split heat pumps (MSHPs) for space conditioning. This research covered the long-term performance of MSHPs in Zone 5A; it is the culmination of up to three years' worth of monitoring in a set of eight houses. This research examined electricity use of MSHPs, distributions of interior temperatures and humidity when using simplified (two-point) heating systems in high performance housing, and the impact of door open/closed status on temperature distributions. The use of simplified space conditioning distribution (MSHPs) provides significant first cost savings, which are used to offset the increased investment in the building enclosure.
Original languageAmerican English
Number of pages143
StatePublished - 2015

Bibliographical note

Work performed by Building Science Corporation, Westford, Massachusetts

NREL Publication Number

  • NREL/SR-5500-63079

Other Report Number

  • DOE/GO-102014-4529


  • BSC
  • Building America
  • comfort
  • ductless heat pump
  • heat pump
  • interior temperatures
  • Massachusetts
  • mini split heat pump
  • monitoring
  • Northeast
  • residential
  • residential buildings
  • Transformations Inc.


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