[{"data":1,"prerenderedAt":377},["ShallowReactive",2],{"project-32838748":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":10,"maker":11,"posted_at":12,"year":13,"points":14,"comments":15,"rank_in_year":16,"shown_in_year":17,"top":18,"tier":19,"category":20,"subcategory":21,"format":22,"keywords":23,"reception":28,"sentiment":29,"stance_mix":30,"scored_comments":14,"aspects":35,"strip":45,"post_text":47,"what":48,"said":76,"maker_in_thread":192,"shape":201,"grid":205,"attempts":338,"same_week":339,"maker_shows":37,"maker_hidden":369,"reader_version":370,"card":371},"32838748","Heat Pumps, Hooray","A heat pump calculator for your home","title","Show HN: Heat Pumps, Hooray – A heat pump calculator for your home","https:\u002F\u002Fheatpumpshooray.com\u002F","heatpumpshooray.com","calvinfo",1663170082,2022,40,56,1089,2570,43,"shown","infrastructure","home energy calculator","web_app",[24,25,26,27],"heat pump calculator","home electrification","heating cost comparison","air source heat pump","mixed",-0.534,{"positive":31,"neutral":32,"mixed":33,"critical":34},7,15,0,18,{"idea":36,"execution":39,"design":40,"performance":42,"pricing":44},{"positive":37,"critical":38},3,1,{"positive":38,"critical":37},{"positive":33,"critical":41},9,{"positive":33,"critical":43},4,{"positive":38,"critical":38},[46,46,46,37,37,38,37,38,38,38,37,38,38,46,38,33,37,37,33,33,33,33,33,33,38,37,38,37,37,38,33,33,38,37,38,38,38,46,37,37],5,null,{"problem":49,"audience":57,"pricing":64,"motivation":68,"time_to_build":47,"stack":72,"openness":73,"stage":74,"team_size":75},{"value":50,"source":51,"evidence":52},"Hard to find good calculators showing a heat pump's impact on a specific home.","commenter",[53],{"id":54,"by":55,"text":56},"32839214","bake","Hi HN -- We’re Baker and Calvin, two heat pump nerds who are really excited about home electrification and its impact on climate change. During our explorations, we realized…",{"value":58,"source":51,"evidence":59},"US homeowners considering heat pumps; the site only works for US homes.",[60,61],{"id":54,"by":55,"text":56},{"id":62,"by":55,"text":63},"32841942","I'd suggest asking the folks at https:\u002F\u002Flun.energy, to start. You're right that our site doesn't yet work for homes outside of the US, unfortunately. The approach would be…",{"value":65,"source":51,"evidence":66},"Free to use.",[67],{"id":54,"by":55,"text":56},{"value":69,"source":51,"evidence":70},"Makers are excited about home electrification and its impact on climate change.",[71],{"id":54,"by":55,"text":56},[],"free","launched","team",{"praise":77,"objections":85,"requests":136,"questions":168,"alternatives":180},[78],{"value":79,"source":51,"evidence":80},"Good information without an overwhelming UI.",[81],{"id":82,"by":83,"text":84},"32839323","Siecje","Great job! This has a lot of information without making the UI overwhelming. I have a bug report I got \"1.5e+2% of your annual heating.\"",[86,96,111,119,129],{"value":87,"source":51,"evidence":88},"Default indoor heating temperature of 68F seems too low, skewing savings.",[89,93],{"id":90,"by":91,"text":92},"32843049","mrguyorama","From the \"calculator\" the default \"heat to\" temp is 68. That seems kind of absurd to call a default indoor air temperature during winter months. Is used for all day or just night…",{"id":94,"by":91,"text":95},"32843618","It's very low for a daytime temperature. Maybe it makes sense with the gas crunch and energy prices in europe, but the specific thing that bothers me about it is hiding that…",{"value":97,"source":51,"evidence":98},"Savings figures don't add up; $24K or $37K totals seem implausible.",[99,103,107],{"id":100,"by":101,"text":102},"32839378","sparrish","\"Switching to a heat pump, you'll save $67.53 per year\" also \"Total savings over a 15-year period are up to $37,000\" I must be missing something cause that doesn't add up.",{"id":104,"by":105,"text":106},"32846356","vba616","It doesn't seem like the chart of costs includes the effect of summer A\u002FC. And the chart that is shown peaks in winter a couple months early. Overall, it seems to significantly…",{"id":108,"by":109,"text":110},"32842756","ars","If you already have an A\u002FC a furnace is very very cheap, so cheap it's almost free (i.e. included with the A\u002FC). I don't see how you can possibly save $37,000 just by getting rid…",{"value":112,"source":51,"evidence":113},"Results underestimate costs and show odd seasonal peaks.",[114,115],{"id":104,"by":105,"text":106},{"id":116,"by":117,"text":118},"32851351","8fingerlouie","I'm a european (with a heat pump), but i tried it anyway. I entered : - Zip 56714 - 2500 sqft - 4 occupants - 1 boiler - no aircon - natural gas and the result was : Switching to…",{"value":120,"source":51,"evidence":121},"Mobile display shows truncated numbers and multi-zone mini-split inputs are miscalculated.",[122,126],{"id":123,"by":124,"text":125},"32842911","sokoloff","On iOS at least, expanded ducts are showing as $15 (despite adding the more reasonable $15K to the total). Similarly, a panel upgrade is listed as “$1,000 to $3” despite adding…",{"id":127,"by":109,"text":128},"32843195","I'm not sure it's doing the right thing when I entered a multi-zone mini-split. It's acting like I'm buying a separate A\u002FC for each zone, but that's not how they are priced. I…",{"value":130,"source":51,"evidence":131},"Performance in very cold climates like Fairbanks is poor.",[132],{"id":133,"by":134,"text":135},"32843372","mig39","Put in the zip code for Fairbanks, Alaska. 99701. Not so good :-( I guess heat pumps aren't great when it's really really cold?",[137,144,155,161],{"value":138,"source":51,"evidence":139},"Support for hydronic\u002Fair-to-water systems.",[140,141],{"id":123,"by":124,"text":125},{"id":142,"by":55,"text":143},"32843571","Roger that! We're hearing the desire for hydronic \u002F air-to-water systems and support for Europe \u002F elsewhere from a few different places, so this is helpful. Note for those in…",{"value":145,"source":51,"evidence":146},"Support for countries outside the US, such as Europe.",[147,151,154],{"id":148,"by":149,"text":150},"32841293","woutgaze","Does anyone know something similar for Europeans (I live in The Netherlands)? Common units used here are all metric; for heating I've seen Natural Gas Usage (in m3) used and…",{"id":152,"by":55,"text":153},"32843517","Thanks for the feedback! We can make those sliders better, thanks for the suggestions. Yes, unfortunately we haven't seen great resources for the rest of the world, either. The…",{"id":142,"by":55,"text":143},{"value":156,"source":51,"evidence":157},"Ground-source heat pump support.",[158],{"id":159,"by":55,"text":160},"32843479","Big plus to ground-source here! Everything shown on the site today is air-source only.",{"value":162,"source":51,"evidence":163},"Clearer labels for basic and advanced sliders.",[164],{"id":165,"by":166,"text":167},"32843435","benj111","The sliders labelled basic are slightly confusing, especially as it's dimmed suggesting 'basic' is off. Maybe a down arrow and advanced? Also as a non USian without a zip code,…",[169,173],{"value":170,"source":51,"evidence":171},"Is the heat-to temperature used for all day or only night?",[172],{"id":90,"by":91,"text":92},{"value":174,"source":51,"evidence":175},"Why does the simulation take so long to run?",[176],{"id":177,"by":178,"text":179},"32850325","Dork1234","It seems like it takes a long time to process\u002Fcalculate the simulation. Is this done server side? Is there a reason for the slowness?",[181,188],{"value":182,"source":51,"evidence":183},"NREL's BEopt software for building energy scenarios.",[184],{"id":185,"by":186,"text":187},"32846698","rainbowzootsuit","I would suggest that folks interested in energy efficiency improvement take a spin with NREL's BEopt software. It allows you to make a simple 3D model of your home, enter its…",{"value":189,"source":51,"evidence":190},"lun.energy, a Swedish heat pump site.",[191],{"id":62,"by":55,"text":63},{"comments":193,"answered":38,"key":194},2,[195,198],{"id":196,"text":197},"32839464","Thanks for giving it a try! We've tried to make this a little clearer in the \"receipt view\", but the major difference is in terms of cost of the hardware. Furnaces, heat pumps,…",{"id":199,"text":200},"32843467","The colder it gets, the lower the efficiency. In a more extreme climate like Fairbanks, the efficiency pretty much drops down to resistive heating (1.0). If you're set on…",{"commenters":202,"max_depth":31,"maker_replies":193,"first_comment_mins":203,"lifespan_hours":204},28,29,38,[206,208,210,212,216,219,221,223,224,227,228,231,234,237,240,244,247,249,252,255,256,259,262,264,265,269,272,274,276,278,281,284,286,289,291,292,294,296,298,300,302,305,310,313,315,317,318,320,322,323,325,327,328,330,332,334],[185,33,46,207,186,33],"project\u002Fpositive\u002Fidea",[209,33,46,207,55,33],"32851574",[54,38,37,211,55,33],"project\u002Fneutral\u002Fnone",[213,38,46,214,215,33],"32840971","maker\u002Fpositive\u002Fexecution","drx",[217,38,37,218,55,33],"32842514","maker\u002Fneutral\u002Fnone",[123,38,38,220,124,33],"project\u002Fcritical\u002Fdesign",[142,38,46,222,55,33],"maker\u002Fpositive\u002Fnone",[90,38,38,220,91,33],[225,38,37,218,226,33],"32843136","mwint",[94,38,38,220,91,33],[229,38,37,230,55,33],"32843730","maker\u002Fneutral\u002Fdesign",[232,38,38,220,233,33],"32845162","callalex",[235,38,38,220,236,33],"32846307","athorax",[238,38,38,220,239,33],"32846990","stevenhubertron",[241,38,37,242,243,33],"32848106","project\u002Fneutral\u002Fdesign","ZeroGravitas",[245,38,38,220,246,33],"32843852","cjrp",[104,38,38,248,105,33],"project\u002Fcritical\u002Fperformance",[250,38,37,251,55,33],"32851646","maker\u002Fneutral\u002Fpricing",[253,38,46,254,55,33],"32852705","maker\u002Fpositive\u002Fpricing",[116,193,38,248,117,33],[257,193,37,258,55,33],"32851525","maker\u002Fneutral\u002Fperformance",[260,193,33,261,117,33],"32862464","commenter\u002Fneutral\u002Fnone",[148,37,37,263,149,33],"project\u002Fneutral\u002Fidea",[62,37,37,263,55,33],[266,37,33,267,268,33],"32842219","other\u002Fneutral\u002Fnone","pjc50",[270,37,33,267,271,33],"32842170","Glawen",[273,37,33,267,268,33],"32842249",[275,37,33,267,55,33],"32842485",[277,37,33,261,124,33],"32842836",[279,37,33,280,105,33],"32846664","commenter\u002Fcritical\u002Fperformance",[282,37,33,283,124,33],"32849684","commenter\u002Fneutral\u002Fperformance",[285,37,33,261,109,33],"32846067",[287,37,33,267,288,33],"32843129","brnt",[290,37,33,267,117,33],"32851510",[127,43,38,220,109,33],[293,43,37,230,55,33],"32843703",[82,46,38,295,83,33],"project\u002Fcritical\u002Fexecution",[297,46,46,222,55,33],"32839432",[177,299,38,248,178,33],6,[301,299,37,258,55,33],"32851388",[303,31,38,295,304,33],"32853402","gs17",[306,307,38,308,309,33],"32844624",8,"project\u002Fcritical\u002Fidea","Projectiboga",[311,307,33,261,312,33],"32845026","teruakohatu",[314,307,33,267,117,33],"32851376",[316,307,37,258,55,33],"32845100",[165,41,38,220,166,33],[152,41,37,319,55,33],"maker\u002Fneutral\u002Fidea",[100,321,38,295,101,33],10,[196,321,33,251,11,38],[108,321,38,324,109,33],"project\u002Fcritical\u002Fpricing",[133,326,38,248,134,33],11,[199,326,33,258,11,38],[159,326,46,329,55,33],"maker\u002Fpositive\u002Fidea",[331,326,37,258,55,33],"32843471",[333,326,33,261,105,33],"32846825",[335,326,37,336,337,33],"32843504","project\u002Fneutral\u002Fperformance","thehappypm",[],[340,345,350,355,359,364],{"id":341,"name":342,"points":343,"category":344},"32768590","Modern for HN",308,"productivity",{"id":346,"name":347,"points":348,"category":349},"32798891","HiFiScan",260,"creative",{"id":351,"name":352,"points":353,"category":354},"32828309","Infernal Sigil",238,"games",{"id":356,"name":357,"points":358,"category":20},"32837829","StackAid",226,{"id":360,"name":361,"points":362,"category":363},"32828799","s3sqlite",160,"dev_tools",{"id":365,"name":366,"points":367,"category":368},"32823589","pg_netstat",158,"data",false,"v2",{"id":372,"name":5,"line":6,"ai":369,"cat":20,"year":13,"points":14,"comments":15,"rec":28,"s":373,"top":18,"kw":374,"maker":11,"domain":10,"tier":19,"attempts":33,"strip":375,"url":9,"mix":376,"praise":79,"objection":87,"sub":21},32838748,-0.53,[24,25,26,27],"5553313111311510330000001313310013111533",[31,32,33,34],1793991051760]