{"id":"ductless-split","version":"0.4.0","classification":{"uniformat":"D3050"},"names":["Ductless mini-split heat pump"],"aliases":["mini split","ductless split","DMS"],"service_life":{"median_years":15.3,"range_years":[15.3,15.3],"range_basis":"source_spread"},"pm_tasks":[],"basis":[{"type":"public_document","life_type":"planning","title":"Updated Buildings Sector Appliance and Equipment Costs and Efficiencies (March 2023), Appendix A: EIA - Technology Forecast Updates - Residential and Commercial Building Technologies - Reference Case (Guidehouse and Leidos, March 3, 2023)","by":"U.S. Energy Information Administration; Appendix A prepared by Guidehouse and Leidos","url":"https://www.eia.gov/analysis/studies/buildings/equipcosts/pdf/full.pdf","page":47,"code":"Residential Ductless Mini-Split Air-Source Heat Pumps","label":"Average Life (y) 15.3 (all years, typical and high efficiency); note 2: \"Assumed same lifespan and maintenance cost as air-source heat pumps given the technology is similar between air-source and ductless mini-split heat pumps, and ductwork itself is not expected to fail.\"","years":15.3,"note":"Printed page 43 (Appendix A). Residential 12 kBtu/h ductless mini-split heat pump. Weibull (15.88, 2, 1). Data-source sheet (PDF p.197, A-17) gives the life source as 'CACs and HPs EERE 2016 Direct Final Rule'; the transfer of that ducted-heat-pump life to mini-splits is the contractor's assumption. Light-commercial use is not stated."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-23","canonical_url":"https://unfinished.one/c/ductless-split","versioned_url":"https://unfinished.one/c/ductless-split/v/0.4.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Ductless mini-split heat pump, v0.4.0. https://unfinished.one/c/ductless-split/v/0.4.0"}