id,name,formula,input_rows,result,unit,limitations
d_ratio_2009,"Heat pumps shipped per gas furnace shipped, 2009",hp / gas,"rows 1, 2",0.755,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2009,"Heat pump shipments minus gas furnace shipments, 2009",hp - gas,"rows 1, 2",-532464,units,Shipments not installs
d_hpshare_2009,"Heat pump share of central AC plus heat pump shipments, 2009",hp / (hp + ac) x 100,"rows 1, 3",31.8,percent,Includes commercial units up to the largest size class
d_heatshare_2009,"Heat pump share of heat pump plus gas and oil furnace shipments, 2009",hp / (hp + gas + oil) x 100,"rows 1, 2, 4",42.4,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2010,"Heat pumps shipped per gas furnace shipped, 2010",hp / gas,"rows 5, 6",0.712,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2010,"Heat pump shipments minus gas furnace shipments, 2010",hp - gas,"rows 5, 6",-705359,units,Shipments not installs
d_hpshare_2010,"Heat pump share of central AC plus heat pump shipments, 2010",hp / (hp + ac) x 100,"rows 5, 7",33.8,percent,Includes commercial units up to the largest size class
d_heatshare_2010,"Heat pump share of heat pump plus gas and oil furnace shipments, 2010",hp / (hp + gas + oil) x 100,"rows 5, 6, 8",41.1,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2011,"Heat pumps shipped per gas furnace shipped, 2011",hp / gas,"rows 9, 10",0.796,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2011,"Heat pump shipments minus gas furnace shipments, 2011",hp - gas,"rows 9, 10",-451158,units,Shipments not installs
d_hpshare_2011,"Heat pump share of central AC plus heat pump shipments, 2011",hp / (hp + ac) x 100,"rows 9, 11",32.0,percent,Includes commercial units up to the largest size class
d_heatshare_2011,"Heat pump share of heat pump plus gas and oil furnace shipments, 2011",hp / (hp + gas + oil) x 100,"rows 9, 10, 12",43.8,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2012,"Heat pumps shipped per gas furnace shipped, 2012",hp / gas,"rows 13, 14",0.757,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2012,"Heat pump shipments minus gas furnace shipments, 2012",hp - gas,"rows 13, 14",-545601,units,Shipments not installs
d_hpshare_2012,"Heat pump share of central AC plus heat pump shipments, 2012",hp / (hp + ac) x 100,"rows 13, 15",30.2,percent,Includes commercial units up to the largest size class
d_heatshare_2012,"Heat pump share of heat pump plus gas and oil furnace shipments, 2012",hp / (hp + gas + oil) x 100,"rows 13, 14, 16",42.7,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2013,"Heat pumps shipped per gas furnace shipped, 2013",hp / gas,"rows 17, 18",0.757,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2013,"Heat pump shipments minus gas furnace shipments, 2013",hp - gas,"rows 17, 18",-633128,units,Shipments not installs
d_hpshare_2013,"Heat pump share of central AC plus heat pump shipments, 2013",hp / (hp + ac) x 100,"rows 17, 19",31.9,percent,Includes commercial units up to the largest size class
d_heatshare_2013,"Heat pump share of heat pump plus gas and oil furnace shipments, 2013",hp / (hp + gas + oil) x 100,"rows 17, 18, 20",42.8,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2014,"Heat pumps shipped per gas furnace shipped, 2014",hp / gas,"rows 21, 22",0.861,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2014,"Heat pump shipments minus gas furnace shipments, 2014",hp - gas,"rows 21, 22",-380723,units,Shipments not installs
d_hpshare_2014,"Heat pump share of central AC plus heat pump shipments, 2014",hp / (hp + ac) x 100,"rows 21, 23",34.3,percent,Includes commercial units up to the largest size class
d_heatshare_2014,"Heat pump share of heat pump plus gas and oil furnace shipments, 2014",hp / (hp + gas + oil) x 100,"rows 21, 22, 24",45.9,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2015,"Heat pumps shipped per gas furnace shipped, 2015",hp / gas,"rows 25, 26",0.806,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2015,"Heat pump shipments minus gas furnace shipments, 2015",hp - gas,"rows 25, 26",-544741,units,Shipments not installs
d_hpshare_2015,"Heat pump share of central AC plus heat pump shipments, 2015",hp / (hp + ac) x 100,"rows 25, 27",33.3,percent,Includes commercial units up to the largest size class
d_heatshare_2015,"Heat pump share of heat pump plus gas and oil furnace shipments, 2015",hp / (hp + gas + oil) x 100,"rows 25, 26, 28",44.3,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2016,"Heat pumps shipped per gas furnace shipped, 2016",hp / gas,"rows 29, 30",0.826,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2016,"Heat pump shipments minus gas furnace shipments, 2016",hp - gas,"rows 29, 30",-512678,units,Shipments not installs
d_hpshare_2016,"Heat pump share of central AC plus heat pump shipments, 2016",hp / (hp + ac) x 100,"rows 29, 31",33.1,percent,Includes commercial units up to the largest size class
d_heatshare_2016,"Heat pump share of heat pump plus gas and oil furnace shipments, 2016",hp / (hp + gas + oil) x 100,"rows 29, 30, 32",44.9,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2017,"Heat pumps shipped per gas furnace shipped, 2017",hp / gas,"rows 33, 34",0.836,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2017,"Heat pump shipments minus gas furnace shipments, 2017",hp - gas,"rows 33, 34",-513986,units,Shipments not installs
d_hpshare_2017,"Heat pump share of central AC plus heat pump shipments, 2017",hp / (hp + ac) x 100,"rows 33, 35",33.6,percent,Includes commercial units up to the largest size class
d_heatshare_2017,"Heat pump share of heat pump plus gas and oil furnace shipments, 2017",hp / (hp + gas + oil) x 100,"rows 33, 34, 36",45.2,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2018,"Heat pumps shipped per gas furnace shipped, 2018",hp / gas,"rows 37, 38",0.861,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2018,"Heat pump shipments minus gas furnace shipments, 2018",hp - gas,"rows 37, 38",-476069,units,Shipments not installs
d_hpshare_2018,"Heat pump share of central AC plus heat pump shipments, 2018",hp / (hp + ac) x 100,"rows 37, 39",35.3,percent,Includes commercial units up to the largest size class
d_heatshare_2018,"Heat pump share of heat pump plus gas and oil furnace shipments, 2018",hp / (hp + gas + oil) x 100,"rows 37, 38, 40",46.0,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2019,"Heat pumps shipped per gas furnace shipped, 2019",hp / gas,"rows 41, 42",0.904,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2019,"Heat pump shipments minus gas furnace shipments, 2019",hp - gas,"rows 41, 42",-332032,units,Shipments not installs
d_hpshare_2019,"Heat pump share of central AC plus heat pump shipments, 2019",hp / (hp + ac) x 100,"rows 41, 43",36.7,percent,Includes commercial units up to the largest size class
d_heatshare_2019,"Heat pump share of heat pump plus gas and oil furnace shipments, 2019",hp / (hp + gas + oil) x 100,"rows 41, 42, 44",47.2,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2020,"Heat pumps shipped per gas furnace shipped, 2020",hp / gas,"rows 45, 46",1.02,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2020,"Heat pump shipments minus gas furnace shipments, 2020",hp - gas,"rows 45, 46",67302,units,Shipments not installs
d_hpshare_2020,"Heat pump share of central AC plus heat pump shipments, 2020",hp / (hp + ac) x 100,"rows 45, 47",36.6,percent,Includes commercial units up to the largest size class
d_heatshare_2020,"Heat pump share of heat pump plus gas and oil furnace shipments, 2020",hp / (hp + gas + oil) x 100,"rows 45, 46, 48",50.2,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2021,"Heat pumps shipped per gas furnace shipped, 2021",hp / gas,"rows 49, 50",0.977,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2021,"Heat pump shipments minus gas furnace shipments, 2021",hp - gas,"rows 49, 50",-92128,units,Shipments not installs
d_hpshare_2021,"Heat pump share of central AC plus heat pump shipments, 2021",hp / (hp + ac) x 100,"rows 49, 51",38.4,percent,Includes commercial units up to the largest size class
d_heatshare_2021,"Heat pump share of heat pump plus gas and oil furnace shipments, 2021",hp / (hp + gas + oil) x 100,"rows 49, 50, 52",49.2,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2022,"Heat pumps shipped per gas furnace shipped, 2022",hp / gas,"rows 53, 54",1.119,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2022,"Heat pump shipments minus gas furnace shipments, 2022",hp - gas,"rows 53, 54",462111,units,Shipments not installs
d_hpshare_2022,"Heat pump share of central AC plus heat pump shipments, 2022",hp / (hp + ac) x 100,"rows 53, 55",41.7,percent,Includes commercial units up to the largest size class
d_heatshare_2022,"Heat pump share of heat pump plus gas and oil furnace shipments, 2022",hp / (hp + gas + oil) x 100,"rows 53, 54, 56",52.6,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2023,"Heat pumps shipped per gas furnace shipped, 2023",hp / gas,"rows 57, 58",1.21,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2023,"Heat pump shipments minus gas furnace shipments, 2023",hp - gas,"rows 57, 58",627116,units,Shipments not installs
d_hpshare_2023,"Heat pump share of central AC plus heat pump shipments, 2023",hp / (hp + ac) x 100,"rows 57, 59",41.8,percent,Includes commercial units up to the largest size class
d_heatshare_2023,"Heat pump share of heat pump plus gas and oil furnace shipments, 2023",hp / (hp + gas + oil) x 100,"rows 57, 58, 60",54.6,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2024,"Heat pumps shipped per gas furnace shipped, 2024",hp / gas,"rows 61, 62",1.321,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2024,"Heat pump shipments minus gas furnace shipments, 2024",hp - gas,"rows 61, 62",1001327,units,Shipments not installs
d_hpshare_2024,"Heat pump share of central AC plus heat pump shipments, 2024",hp / (hp + ac) x 100,"rows 61, 63",42.6,percent,Includes commercial units up to the largest size class
d_heatshare_2024,"Heat pump share of heat pump plus gas and oil furnace shipments, 2024",hp / (hp + gas + oil) x 100,"rows 61, 62, 64",56.7,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_ratio_2025,"Heat pumps shipped per gas furnace shipped, 2025",hp / gas,"rows 65, 66",1.122,ratio,Shipments not installs; heat pumps also serve cooling-only replacements
d_lead_2025,"Heat pump shipments minus gas furnace shipments, 2025",hp - gas,"rows 65, 66",397170,units,Shipments not installs
d_hpshare_2025,"Heat pump share of central AC plus heat pump shipments, 2025",hp / (hp + ac) x 100,"rows 65, 67",47.0,percent,Includes commercial units up to the largest size class
d_heatshare_2025,"Heat pump share of heat pump plus gas and oil furnace shipments, 2025",hp / (hp + gas + oil) x 100,"rows 65, 66, 68",52.6,percent,"Excludes boilers, ductless-only lines not reported, and electric furnaces"
d_first,First year in 2009 to 2025 in which heat pump shipments exceeded gas furnace shipments,min(year) where hp > gas,rows 1 to 68,2020,year,AHRI releases before 2009 not compiled
d_lead25_pct,"Heat pump lead over gas furnaces, 2025",(hp2025 / gas2025 - 1) x 100,"rows 65, 66",12.2,percent,Shipments not installs
d_lead24_pct,"Heat pump lead over gas furnaces, 2024",(hp2024 / gas2024 - 1) x 100,"rows 61, 62",32.1,percent,2024 includes pre-transition shipping noted by trade press
d_ytdratio_2024,"Heat pumps per gas furnace, January to August 2024 (SIGNATURE)",hp_ytd_aug / gas_ytd_aug,"rows 69, 70",1.409,ratio,Jan to Aug excludes the September to December furnace season
d_ytdgap_2024,"Jan to Aug ratio minus full-year ratio, 2024",ytd_ratio - full_ratio,"rows 69, 70, 61, 62",0.088,ratio points,Two years of observation only
d_gas_sepdec_2024,Share of 2024 gas furnace shipments made September to December,(gas_full - gas_ytd_aug) / gas_full x 100,"rows 62, 70",35.6,percent,Uses Aug YTD from the August 2026 release and full year from December 2025 release (revisions may differ slightly)
d_hp_sepdec_2024,Share of 2024 heat pump shipments made September to December,(hp_full - hp_ytd_aug) / hp_full x 100,"rows 61, 69",31.3,percent,Same as above
d_ytdratio_2025,"Heat pumps per gas furnace, January to August 2025 (SIGNATURE)",hp_ytd_aug / gas_ytd_aug,"rows 73, 74",1.241,ratio,Jan to Aug excludes the September to December furnace season
d_ytdgap_2025,"Jan to Aug ratio minus full-year ratio, 2025",ytd_ratio - full_ratio,"rows 73, 74, 65, 66",0.119,ratio points,Two years of observation only
d_gas_sepdec_2025,Share of 2025 gas furnace shipments made September to December,(gas_full - gas_ytd_aug) / gas_full x 100,"rows 66, 74",31.8,percent,Uses Aug YTD from the August 2026 release and full year from December 2025 release (revisions may differ slightly)
d_hp_sepdec_2025,Share of 2025 heat pump shipments made September to December,(hp_full - hp_ytd_aug) / hp_full x 100,"rows 65, 73",24.5,percent,Same as above
d_ytdratio_2026,"Heat pumps per gas furnace, January to August 2026 (SIGNATURE)",hp_ytd_aug / gas_ytd_aug,"rows 77, 78",1.381,ratio,Jan to Aug excludes the September to December furnace season
d_ytdchg_hp,"Change in heat pump shipments, Jan to Aug 2026 vs Jan to Aug 2025",(hpytd2026 / hpytd2025 - 1) x 100,"rows 77, 73",5.7,percent,Preliminary; AHRI revises
d_ytdchg_gas,"Change in gas furnace shipments, Jan to Aug 2026 vs Jan to Aug 2025",(gasytd2026 / gasytd2025 - 1) x 100,"rows 78, 74",-5.0,percent,Preliminary; AHRI revises
d_ytdchg_ac,"Change in central AC shipments, Jan to Aug 2026 vs Jan to Aug 2025",(acytd2026 / acytd2025 - 1) x 100,"rows 79, 75",6.5,percent,Preliminary; AHRI revises
d_ytd_hpshare,"Heat pump share of central AC plus heat pump shipments, Jan to Aug 2026",hp / (hp + ac) x 100,"rows 77, 79",45.5,percent,Partial year
d_hp_gt_ac,Months in Jan 2020 to Aug 2026 when heat pump shipments exceeded central AC shipments,count(month) where hp > ac,tables/monthly_2020_2026_full.csv,5,months,Sep 2025 to Jan 2026; latest months subject to revision
d_gas_gt_hp,Months in Jan 2020 to Aug 2026 when gas furnace shipments exceeded heat pump shipments,count(month) where gas > hp,tables/monthly_2020_2026_full.csv,20,months,80 months observed
d_maxratio,"Highest monthly heat pump to gas furnace ratio, Jan 2020 to Aug 2026 (July 2024)",max(hp / gas),"rows 94, 95",1.686,ratio,Single month
d_minratio,"Lowest monthly heat pump to gas furnace ratio, Jan 2020 to Aug 2026 (December 2020)",min(hp / gas),"rows 96, 97",0.686,ratio,Single month
d_aug26ratio,"Heat pumps per gas furnace, August 2026",hp / gas,"rows 91, 92",1.176,ratio,"Single month, preliminary"
d_g_hp,"Growth in annual heat pump shipments, 2009 to 2025",(hp2025 / hp2009 - 1) x 100,"rows 65, 1",122.0,percent,2009 was a recession trough
d_g_gas,"Growth in annual gas furnace shipments, 2009 to 2025",(gas2025 / gas2009 - 1) x 100,"rows 66, 2",49.3,percent,2009 was a recession trough
d_g_ac,"Change in annual central AC shipments, 2009 to 2025",(ac2025 / ac2009 - 1) x 100,"rows 67, 3",16.8,percent,2009 was a recession trough
d_g_hp2225,"Change in heat pump shipments, 2022 peak to 2025",(hp2025 / hp2022 - 1) x 100,"rows 65, 53",-15.9,percent,
d_res2025,"Share of 2025 central AC plus heat pump shipments under 65,000 BTUH (residential sizes)",res / total x 100,"rows 111, 112",96.5,percent,Combined AC and HP; not separated
d_recs_Total U.S.,"Share of homes heated mainly by a central heat pump, Total U.S., 2020",hp / homes x 100,"rows 114, 113",13.1,percent,Main heat only; sampling error
d_recsany_Total U.S.,"Share of homes heated mainly by a central or ductless heat pump, Total U.S., 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 114, 115, 113",13.9,percent,"Q cells treated as zero, so a floor"
d_recsfur_Total U.S.,"Share of homes heated mainly by a central furnace (any fuel), Total U.S., 2020",fur / homes x 100,"rows 116, 113",60.2,percent,Sampling error
d_recs_East South Central,"Share of homes heated mainly by a central heat pump, East South Central, 2020",hp / homes x 100,"rows 118, 117",31.8,percent,Main heat only; sampling error
d_recsany_East South Central,"Share of homes heated mainly by a central or ductless heat pump, East South Central, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 118, 119, 117",31.8,percent,"Q cells treated as zero, so a floor"
d_recsfur_East South Central,"Share of homes heated mainly by a central furnace (any fuel), East South Central, 2020",fur / homes x 100,"rows 120, 117",53.4,percent,Sampling error
d_recs_South Atlantic,"Share of homes heated mainly by a central heat pump, South Atlantic, 2020",hp / homes x 100,"rows 122, 121",30.1,percent,Main heat only; sampling error
d_recsany_South Atlantic,"Share of homes heated mainly by a central or ductless heat pump, South Atlantic, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 122, 123, 121",31.0,percent,"Q cells treated as zero, so a floor"
d_recsfur_South Atlantic,"Share of homes heated mainly by a central furnace (any fuel), South Atlantic, 2020",fur / homes x 100,"rows 124, 121",48.0,percent,Sampling error
d_recs_West South Central,"Share of homes heated mainly by a central heat pump, West South Central, 2020",hp / homes x 100,"rows 126, 125",18.5,percent,Main heat only; sampling error
d_recsany_West South Central,"Share of homes heated mainly by a central or ductless heat pump, West South Central, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 126, 127, 125",19.2,percent,"Q cells treated as zero, so a floor"
d_recsfur_West South Central,"Share of homes heated mainly by a central furnace (any fuel), West South Central, 2020",fur / homes x 100,"rows 128, 125",61.1,percent,Sampling error
d_recs_Mountain,"Share of homes heated mainly by a central heat pump, Mountain, 2020",hp / homes x 100,"rows 130, 129",9.1,percent,Main heat only; sampling error
d_recsany_Mountain,"Share of homes heated mainly by a central or ductless heat pump, Mountain, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 130, 131, 129",9.9,percent,"Q cells treated as zero, so a floor"
d_recsfur_Mountain,"Share of homes heated mainly by a central furnace (any fuel), Mountain, 2020",fur / homes x 100,"rows 132, 129",69.6,percent,Sampling error
d_recs_West North Central,"Share of homes heated mainly by a central heat pump, West North Central, 2020",hp / homes x 100,"rows 134, 133",5.4,percent,Main heat only; sampling error
d_recsany_West North Central,"Share of homes heated mainly by a central or ductless heat pump, West North Central, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 134, 135, 133",5.4,percent,"Q cells treated as zero, so a floor"
d_recsfur_West North Central,"Share of homes heated mainly by a central furnace (any fuel), West North Central, 2020",fur / homes x 100,"rows 136, 133",77.6,percent,Sampling error
d_recs_Pacific,"Share of homes heated mainly by a central heat pump, Pacific, 2020",hp / homes x 100,"rows 138, 137",4.8,percent,Main heat only; sampling error
d_recsany_Pacific,"Share of homes heated mainly by a central or ductless heat pump, Pacific, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 138, 139, 137",6.4,percent,"Q cells treated as zero, so a floor"
d_recsfur_Pacific,"Share of homes heated mainly by a central furnace (any fuel), Pacific, 2020",fur / homes x 100,"rows 140, 137",56.9,percent,Sampling error
d_recs_Middle Atlantic,"Share of homes heated mainly by a central heat pump, Middle Atlantic, 2020",hp / homes x 100,"rows 142, 141",4.2,percent,Main heat only; sampling error
d_recsany_Middle Atlantic,"Share of homes heated mainly by a central or ductless heat pump, Middle Atlantic, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 142, 143, 141",5.3,percent,"Q cells treated as zero, so a floor"
d_recsfur_Middle Atlantic,"Share of homes heated mainly by a central furnace (any fuel), Middle Atlantic, 2020",fur / homes x 100,"rows 144, 141",51.4,percent,Sampling error
d_recs_East North Central,"Share of homes heated mainly by a central heat pump, East North Central, 2020",hp / homes x 100,"rows 146, 145",3.4,percent,Main heat only; sampling error
d_recsany_East North Central,"Share of homes heated mainly by a central or ductless heat pump, East North Central, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 146, 147, 145",3.4,percent,"Q cells treated as zero, so a floor"
d_recsfur_East North Central,"Share of homes heated mainly by a central furnace (any fuel), East North Central, 2020",fur / homes x 100,"rows 148, 145",78.8,percent,Sampling error
d_recs_New England,"Share of homes heated mainly by a central heat pump, New England, 2020",hp / homes x 100,"rows 150, 149",1.7,percent,Main heat only; sampling error
d_recsany_New England,"Share of homes heated mainly by a central or ductless heat pump, New England, 2020",(hp + ductless) / homes x 100 (Q treated as 0),"rows 150, 151, 149",3.1,percent,"Q cells treated as zero, so a floor"
d_recsfur_New England,"Share of homes heated mainly by a central furnace (any fuel), New England, 2020",fur / homes x 100,"rows 152, 149",54.8,percent,Sampling error
d_recs_any_us,"Homes heated mainly by central or ductless heat pump, US, 2020",16.13 + 1.06,"rows 114, 115",17.19,million homes,Main heat only
d_recs_gasfur_share,"Share of homes heated mainly by a natural gas central furnace, US, 2020",gasfur / homes x 100,"rows 161, 113",43.1,percent,
d_hp_per100,2020 heat pump shipments per 100 homes heated mainly by a heat pump (central or ductless),hp2020 / (17.19 million) x 100,"rows 45, 114, 115",19.9,units per 100 homes,"Shipments also go to cooling-only, dual-fuel, new and commercial installs, so this is not a replacement rate"
d_gas_per100,2020 gas furnace shipments per 100 homes heated mainly by a gas central furnace,gas2020 / (53.26 million) x 100,"rows 46, 161",6.3,units per 100 homes,"Furnaces also go to new homes, propane conversions and commercial uses"
d_stock_Single-family detached,"Share of homes heated mainly by a central heat pump, Single-family detached, 2020",hp / homes x 100,"rows 165, 164",13.0,percent,Sampling error
d_stock_Single-family attached,"Share of homes heated mainly by a central heat pump, Single-family attached, 2020",hp / homes x 100,"rows 167, 166",10.1,percent,Sampling error
d_stock_Apartments (2 to 4 units),"Share of homes heated mainly by a central heat pump, Apartments (2 to 4 units), 2020",hp / homes x 100,"rows 169, 168",9.9,percent,Sampling error
d_stock_Apartments (5 or more units),"Share of homes heated mainly by a central heat pump, Apartments (5 or more units), 2020",hp / homes x 100,"rows 171, 170",12.6,percent,Sampling error
d_stock_Mobile home,"Share of homes heated mainly by a central heat pump, Mobile home, 2020",hp / homes x 100,"rows 173, 172",23.1,percent,Sampling error
d_stock_Before 1950,"Share of homes heated mainly by a central heat pump, Before 1950, 2020",hp / homes x 100,"rows 175, 174",4.2,percent,Sampling error
d_stock_1950 to 1959,"Share of homes heated mainly by a central heat pump, 1950 to 1959, 2020",hp / homes x 100,"rows 177, 176",7.3,percent,Sampling error
d_stock_1960 to 1969,"Share of homes heated mainly by a central heat pump, 1960 to 1969, 2020",hp / homes x 100,"rows 179, 178",10.0,percent,Sampling error
d_stock_1970 to 1979,"Share of homes heated mainly by a central heat pump, 1970 to 1979, 2020",hp / homes x 100,"rows 181, 180",13.5,percent,Sampling error
d_stock_1980 to 1989,"Share of homes heated mainly by a central heat pump, 1980 to 1989, 2020",hp / homes x 100,"rows 183, 182",17.2,percent,Sampling error
d_stock_1990 to 1999,"Share of homes heated mainly by a central heat pump, 1990 to 1999, 2020",hp / homes x 100,"rows 185, 184",17.9,percent,Sampling error
d_stock_2000 to 2009,"Share of homes heated mainly by a central heat pump, 2000 to 2009, 2020",hp / homes x 100,"rows 187, 186",17.2,percent,Sampling error
d_stock_2010 to 2015,"Share of homes heated mainly by a central heat pump, 2010 to 2015, 2020",hp / homes x 100,"rows 189, 188",18.6,percent,Sampling error
d_stock_2016 to 2020,"Share of homes heated mainly by a central heat pump, 2016 to 2020, 2020",hp / homes x 100,"rows 191, 190",20.8,percent,Sampling error
d_cenchg_South,"Change in new-home heat pump share, South, 2020 to 2025",p25 - p20,"rows 192, 193",4.0,percentage points,Survey estimates
d_recsreg_South,"Share of existing homes heated mainly by a central heat pump, South, 2020",region hp / region homes x 100,"rows 158, 157",26.7,percent,Sampling error
d_gap_South,"New-home heat pump share 2025 divided by installed central heat pump share 2020, South (SIGNATURE 2)",p25 / recs_share,"rows 193, 158, 157",2.4,times,Different years (2025 vs 2020) and universes (new single-family vs all occupied homes)
d_cenchg_West,"Change in new-home heat pump share, West, 2020 to 2025",p25 - p20,"rows 196, 197",25.0,percentage points,Survey estimates
d_recsreg_West,"Share of existing homes heated mainly by a central heat pump, West, 2020",region hp / region homes x 100,"rows 160, 159",6.3,percent,Sampling error
d_gap_West,"New-home heat pump share 2025 divided by installed central heat pump share 2020, West (SIGNATURE 2)",p25 / recs_share,"rows 197, 160, 159",6.7,times,Different years (2025 vs 2020) and universes (new single-family vs all occupied homes)
d_cenchg_Northeast,"Change in new-home heat pump share, Northeast, 2020 to 2025",p25 - p20,"rows 200, 201",3.0,percentage points,Survey estimates
d_recsreg_Northeast,"Share of existing homes heated mainly by a central heat pump, Northeast, 2020",region hp / region homes x 100,"rows 154, 153",3.6,percent,Sampling error
d_gap_Northeast,"New-home heat pump share 2025 divided by installed central heat pump share 2020, Northeast (SIGNATURE 2)",p25 / recs_share,"rows 201, 154, 153",3.9,times,Different years (2025 vs 2020) and universes (new single-family vs all occupied homes)
d_cenchg_Midwest,"Change in new-home heat pump share, Midwest, 2020 to 2025",p25 - p20,"rows 204, 205",-3.0,percentage points,Survey estimates
d_recsreg_Midwest,"Share of existing homes heated mainly by a central heat pump, Midwest, 2020",region hp / region homes x 100,"rows 156, 155",4.0,percent,Sampling error
d_gap_Midwest,"New-home heat pump share 2025 divided by installed central heat pump share 2020, Midwest (SIGNATURE 2)",p25 / recs_share,"rows 205, 156, 155",1.8,times,Different years (2025 vs 2020) and universes (new single-family vs all occupied homes)
d_gap_US,"New-home heat pump share 2025 divided by installed central heat pump share 2020, US",48 / 13.1,"rows 209, 114, 113",3.7,times,Different years and universes
d_cen_gap_us,"New single-family houses: furnace count minus heat pump count, US, 2025",490 - 483,"rows 212, 210",7.0,thousand houses,Within survey error