{"engine":"home-heating-and-cooling-planner","routes":{"quick":{"what":"Cooling one room or a few rooms. Returns a system: portable, window, through-wall, single-split, multi-split or ducted.","answeredBy":"An Answers object with no `home` block.","steps":["scope","room_type","room_size","preference","permanent","outdoor","windows","usage","heating","extras","cost"]},"whole_home":{"what":"Heating, cooling and hot water for a whole home. Returns a plan: what stays, what is added, what is removed, and which equipment does each job.","answeredBy":"An Answers object with scope 'whole_home', no rooms, and a `home` block.","steps":["scope","existing_heating","hot_water","disruption","appearance","outdoor_location"]}},"notes":["Questions are asked in this order for a room-based flow; the whole-home route asks the `home` questions instead.","installPreference 'removable' means permanentChanges and outdoorUnit are not asked — send 'unknown' for both.","priority defaults to 'overall'. Send a specific priority to re-weigh the cooling comparison; home.weighBy does the same for a whole-home plan.","Whole-home answers must set scope to 'whole_home' and rooms to []. home.heatDistribution can be omitted where the fuel implies it; home.storeys can be omitted for a flat or bungalow.","No whole-home price is returned: costTier is a qualitative tier of ours. The air-conditioning part of a plan carries a real estimate from the site's versioned estimator."],"questions":[{"id":"scope","field":"scopeChoice","heading":"What are you trying to sort out?","supporting":null,"whyWeAsk":"It decides which questions follow.","multiSelect":null,"options":[{"value":"few_rooms","label":"Rooms that get too hot or too cold","hint":"A bedroom, an office, a conservatory"},{"value":"whole_home","label":"The whole home","hint":"Heating and cooling, planned together"},{"value":"heating_replacement","label":"My heating","hint":"Replacing a boiler or an old system"},{"value":"renovation","label":"A renovation or new build","hint":"Plan it in from the start"},{"value":"unsure","label":"I'm not sure yet","hint":"We'll help you work it out"}],"comparison":null},{"id":"unsure_fix","field":"scopeResolved","heading":"What's the main thing you want to fix?","supporting":null,"whyWeAsk":null,"multiSelect":null,"options":[{"value":"few_rooms","label":"Certain rooms","hint":"Usually a bedroom, office or conservatory"},{"value":"whole_home","label":"The whole house","hint":"Too hot in summer, or not warm enough"},{"value":"heating_replacement","label":"My heating","hint":"Old, expensive, or about to fail"},{"value":"renovation","label":"I'm renovating","hint":"Plan it in from the start"}],"comparison":null},{"id":"room_type","field":"roomType","heading":"Which room is it for?","supporting":null,"whyWeAsk":"Lofts, conservatories and open-plan spaces gain heat very differently from a bedroom.","multiSelect":null,"options":[{"value":"bedroom","label":"Bedroom","hint":null},{"value":"living_room","label":"Living room","hint":null},{"value":"kitchen_open_plan","label":"Kitchen or open-plan space","hint":null},{"value":"home_office","label":"Home office","hint":null},{"value":"loft","label":"Loft room","hint":null},{"value":"conservatory","label":"Conservatory","hint":null},{"value":"other","label":"Other","hint":null}],"comparison":null},{"id":"room_size","field":"roomSize","heading":"Roughly how big is the room?","supporting":"A rough idea is plenty — no tape measure needed.","whyWeAsk":"Very large spaces rule out the smaller options; an installer sizes the unit itself.","multiSelect":null,"options":[{"value":"small","label":"Small","hint":"Box room · under 10 m²"},{"value":"medium","label":"Medium","hint":"Typical bedroom · 10–20 m²"},{"value":"large","label":"Large","hint":"A big bedroom or living room · 20–35 m²"},{"value":"very_large","label":"Very large or open plan","hint":"35 m² and up"},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"replace_heating","field":"replaceHeating","heading":"Are you replacing your heating too?","supporting":null,"whyWeAsk":null,"multiSelect":null,"options":[{"value":"yes","label":"Yes","hint":null},{"value":"no","label":"No","hint":null},{"value":"unsure","label":"I'm not sure","hint":null}],"comparison":null},{"id":"major_work","field":"majorBuildingWork","heading":"Are you renovating, or open to building work?","supporting":null,"whyWeAsk":null,"multiSelect":null,"options":[{"value":"yes","label":"Yes","hint":null},{"value":"no","label":"No","hint":null},{"value":"maybe","label":"Maybe","hint":null}],"comparison":null},{"id":"preference","field":"installPreference","heading":"A fixed system, or something you can put away?","supporting":null,"whyWeAsk":"This is what you'd prefer — what the property allows comes next.","multiSelect":null,"options":[{"value":"removable","label":"Something I can put away","hint":"A portable or window unit"},{"value":"fixed","label":"A fixed, installed system","hint":"Wall-mounted, fitted by an installer"},{"value":"either","label":"Either — show me what makes sense","hint":null}],"comparison":{"summary":"What's the difference?","columns":["Put away","Fixed"],"basis":"Noise and power are our general assessment across typical UK units; costs are indicative and ours.","rows":[["Cost","A few hundred pounds to buy","Thousands, installed"],["Noise indoors","Noticeable — the whole machine is in the room","Quiet — the noisy part is outside"],["Cooling power","One room, on a hot day","Any room size; heats in winter too"],["Installation","None — plug in, or lift into a window","A professional, an outdoor unit, a hole in the wall"],["Out of season","Stored in a cupboard","Stays on the wall"]]}},{"id":"permanent","field":"permanentChanges","heading":"Can permanent changes be made to the property?","supporting":"For example, drilling through an outside wall or mounting equipment.","whyWeAsk":"Every fixed system needs it. Without it, it's portable or window units.","multiSelect":null,"options":[{"value":"yes","label":"Yes","hint":null},{"value":"permission","label":"Yes, but I'd need permission","hint":null},{"value":"no","label":"No","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"outdoor","field":"outdoorUnit","heading":"Could you have a separate outdoor unit?","supporting":"A box on an outside wall, balcony, flat roof or the ground. An air-conditioning condenser is roughly 0.8m wide and 0.3m deep.","whyWeAsk":"This decides whether a split system is even possible.","multiSelect":null,"options":[{"value":"yes","label":"Yes","hint":null},{"value":"probably","label":"Probably","hint":null},{"value":"no","label":"No","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"windows","field":"windowType","heading":"What kind of windows does the room have?","supporting":null,"whyWeAsk":"Window units only fit certain kinds of window.","multiSelect":null,"options":[{"value":"vertical_sash","label":"Vertical sash","hint":"Slides up and down"},{"value":"sliding","label":"Sliding","hint":"Slides sideways"},{"value":"casement","label":"Casement","hint":"Opens outwards on hinges"},{"value":"tilt_turn","label":"Tilt-and-turn","hint":null},{"value":"other","label":"Other","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"usage","field":"usage","heading":"How often do you expect to use it?","supporting":null,"whyWeAsk":"The strongest signal between a portable and a fixed system.","multiSelect":null,"options":[{"value":"occasional","label":"Just during hot spells","hint":"A few weeks each year"},{"value":"summer","label":"Regularly through summer","hint":null},{"value":"frequent","label":"Much of the year","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"heating","field":"heating","heading":"Would you like it to heat the room too?","supporting":"Most fixed AC is an air-to-air heat pump: it heats in winter as well as cooling in summer.","whyWeAsk":"Fixed systems heat efficiently; portables and window units mostly don't.","multiSelect":null,"options":[{"value":"yes","label":"Yes","hint":null},{"value":"nice_to_have","label":"Nice to have","hint":null},{"value":"no","label":"No — cooling is what matters","hint":null}],"comparison":null},{"id":"extras","field":"extras","heading":"Anything else that matters?","supporting":"Pick any. They don't change the type of system — they shape the brief we send installers.","whyWeAsk":null,"multiSelect":{"max":5,"min":0,"emptySentinel":"none"},"options":[{"value":"clean_air","label":"Cleaner air","hint":"Allergies or asthma"},{"value":"humidity","label":"Taking the humidity out","hint":null},{"value":"quiet_night","label":"Very quiet at night","hint":null},{"value":"app_control","label":"Control from my phone","hint":null},{"value":"discreet","label":"A slim, discreet indoor unit","hint":null},{"value":"none","label":"Nothing else","hint":null}],"comparison":null},{"id":"cost","field":"costStance","heading":"What feels about right to spend?","supporting":"A good portable or window unit is usually under £1,000. A properly installed fixed system starts from around £2,500 in our estimator, and does far more.","whyWeAsk":"If a better system costs more than this, we'll still show it to you.","multiSelect":null,"options":[{"value":"under_500","label":"Under about £500","hint":null},{"value":"under_1500","label":"Up to about £1,500","hint":null},{"value":"open_to_fixed","label":"Open to a fixed installation","hint":"From around £2,500"},{"value":"unknown","label":"I'm not sure","hint":"Show me everything"}],"comparison":null},{"id":"existing_heating","field":"existingHeating","heading":"How is your home heated today?","supporting":null,"whyWeAsk":"It decides whether your radiators can stay, and whether support is available.","multiSelect":null,"options":[{"value":"gas_boiler","label":"Gas boiler","hint":"A gas meter, and a boiler somewhere indoors"},{"value":"oil_boiler","label":"Oil boiler","hint":"An oil tank outside, filled by delivery"},{"value":"lpg_boiler","label":"LPG boiler","hint":"Bottled gas or a tank outside, not oil"},{"value":"electric_radiators","label":"Electric radiators or panel heaters","hint":"Slim wall heaters, warm when switched on"},{"value":"storage_heaters","label":"Storage heaters","hint":"Bulky heaters that charge overnight"},{"value":"air_to_water","label":"Air-to-water heat pump","hint":"A unit outside feeding your radiators"},{"value":"air_to_air","label":"Air-to-air heat pump or fixed AC","hint":"Wall units that blow warm or cool air"},{"value":"communal","label":"Communal or district heating","hint":"From a shared plant room, no boiler"},{"value":"none","label":"No fixed heating","hint":null},{"value":"other","label":"Something else","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"heat_distribution","field":"heatDistribution","heading":"How does the heat reach your rooms?","supporting":null,"whyWeAsk":"A heat pump can use radiators you already have. Without them, they'd have to go in first.","multiSelect":null,"options":[{"value":"radiators","label":"Water-filled radiators","hint":"Metal wall panels that get hot all over"},{"value":"underfloor","label":"Underfloor heating","hint":"The floor warms up; no radiators"},{"value":"mixture","label":"A mixture","hint":"Underfloor downstairs, radiators upstairs"},{"value":"warm_air","label":"Warm-air vents","hint":"Grilles that blow warm air, not radiators"},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"hot_water","field":"hotWater","heading":"How is your hot water heated?","supporting":null,"whyWeAsk":"A combi makes hot water in the boiler, so replacing it means solving hot water too.","multiSelect":null,"options":[{"value":"combi","label":"Combi boiler","hint":"No tank anywhere; hot water within seconds"},{"value":"boiler_cylinder","label":"Boiler with a hot-water cylinder","hint":"A tank in the airing cupboard"},{"value":"immersion_cylinder","label":"Electric immersion cylinder","hint":"A tank with its own electric switch"},{"value":"heat_pump_cylinder","label":"Heat-pump cylinder","hint":"A tank fed by a heat pump"},{"value":"communal","label":"Communal system","hint":"From a shared plant room"},{"value":"instant_electric","label":"Instantaneous electric heater","hint":"A heater at the tap or shower"},{"value":"other","label":"Something else","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":{"summary":"Not sure which? Look for a tank","columns":["Combi","Cylinder","Electric"],"basis":"A rule of thumb, not a survey. If it does not match your home, choose \"I'm not sure\" — it costs you nothing here.","rows":[["Tank in an airing cupboard","None","Yes","Yes"],["Cold tank in the loft","None","Sometimes","No"],["Hot water when the heating is off","Yes","Depends on the timer","Yes"],["What heats the water","The boiler, on demand","The boiler, into the tank","Electricity"]]}},{"id":"retain","field":"retain","heading":"What would you prefer to keep?","supporting":"The question that decides your plan. \"Replacing my heating\" needn't mean losing your radiators.","whyWeAsk":"We'd rather build around what you keep than assume you'll replace it.","multiSelect":null,"options":[{"value":"keep_heating_add_cooling","label":"Keep my heating, add cooling","hint":null},{"value":"keep_radiators_replace_boiler","label":"Keep my radiators, replace the boiler","hint":null},{"value":"keep_hot_water","label":"Keep my hot water as it is","hint":null},{"value":"replace_everything","label":"I'm open to replacing everything","hint":null},{"value":"show_trade_offs","label":"I'm not sure","hint":"Show me the trade-offs"}],"comparison":null},{"id":"coverage","field":"coverage","heading":"Which parts of the home need cooling?","supporting":"Pick any. Heating is handled for the whole home either way.","whyWeAsk":"Cooling is the expensive half — better where it's needed than everywhere.","multiSelect":{"max":6,"min":1},"options":[{"value":"bedrooms","label":"The bedrooms","hint":null},{"value":"living_areas","label":"The living areas","hint":null},{"value":"kitchen_open_plan","label":"The kitchen or open-plan space","hint":null},{"value":"loft_top_floor","label":"The loft or top floor","hint":null},{"value":"conservatory","label":"The conservatory","hint":null},{"value":"whole_home","label":"Every room","hint":null},{"value":"none","label":"None — this is about heating","hint":null}],"comparison":null},{"id":"property_type","field":"propertyType","heading":"What kind of home is it?","supporting":null,"whyWeAsk":"It sets what's likely possible outside, and whose permission you may need.","multiSelect":null,"options":[{"value":"detached","label":"Detached house","hint":null},{"value":"semi_detached","label":"Semi-detached house","hint":null},{"value":"terraced","label":"Terraced house","hint":null},{"value":"bungalow","label":"Bungalow","hint":null},{"value":"flat_purpose_built","label":"Purpose-built flat","hint":null},{"value":"flat_converted","label":"Converted flat","hint":null},{"value":"other","label":"Something else","hint":null}],"comparison":null},{"id":"disruption","field":"disruption","heading":"How much disruption are you comfortable with?","supporting":"Be honest here — it rules options in and out more sharply than budget does.","whyWeAsk":"Concealed equipment needs the building open. Living in it changes the plan.","multiSelect":null,"options":[{"value":"minimal","label":"Minimal work","hint":"I'm living in the property"},{"value":"some","label":"Some redecorating and pipework","hint":null},{"value":"renovating","label":"I'm already renovating","hint":null},{"value":"major","label":"A major refurbishment or new build","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"appearance","field":"appearance","heading":"How hidden does the indoor equipment need to be?","supporting":null,"whyWeAsk":"Appearance changes the architecture and the price, not just the model.","multiSelect":null,"options":[{"value":"visible_fine","label":"Visible wall units are fine","hint":"Usually the cheapest fixed option"},{"value":"pay_for_discreet","label":"I'd pay more for less-visible units","hint":"Low consoles or ceiling cassettes"},{"value":"concealed_only","label":"Concealed — grilles and nothing else","hint":"Needs ceiling or loft space, and more work"},{"value":"unknown","label":"I'm not sure","hint":"Show me the difference"}],"comparison":{"summary":"What's the difference?","columns":["Visible","Less visible","Concealed"],"rows":[["What you see","A unit on the wall in each room","A slim console or a ceiling cassette","A grille, and nothing else"],["Building work","Pipework and a wall penetration","More careful routing and making good","Ceiling or loft access, duct routes, making good"],["Cost","The least of the three","More, for the same cooling","The most, for the same cooling"],["Best suited to","An occupied home","An occupied home, done carefully","A refurbishment or new build"]],"basis":"Airva's own assessment of these three approaches relative to each other. An installer's survey decides what your home can take."}},{"id":"concealed_space","field":"concealedSpace","heading":"Is there space for concealed equipment?","supporting":"Hidden equipment has to go somewhere — usually above a ceiling.","whyWeAsk":"Without usable space, concealed systems aren't an option however much you'd prefer them.","multiSelect":null,"options":[{"value":"loft","label":"An accessible loft above the rooms","hint":null},{"value":"ceiling_void","label":"Suspended ceilings or ceiling voids","hint":null},{"value":"being_created","label":"Space being created during the work","hint":null},{"value":"none","label":"None of these","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"outdoor_location","field":"outdoorLocation","heading":"Where could an outdoor unit go?","supporting":"Pick any that could work. A heat pump's outdoor unit is roughly the size of a large suitcase — about 1m wide and 0.4m deep — and needs around a metre of clear air in front of it. A heat pump has to stand on the ground or a solid flat surface; an installer confirms the exact spot.","whyWeAsk":"Nearly every efficient system has something outside. This decides which are possible.","multiSelect":{"max":7,"min":1},"options":[{"value":"ground_beside_house","label":"On the ground beside the house","hint":null},{"value":"side_passage","label":"In a side passage","hint":null},{"value":"external_wall","label":"On an external wall","hint":"Bracket-mounted — no room for a heat pump"},{"value":"balcony_terrace","label":"On a balcony or terrace","hint":"Usually no room for a heat pump"},{"value":"flat_roof","label":"On a flat roof","hint":null},{"value":"garden_patio","label":"In a small garden or patio","hint":null},{"value":"nowhere","label":"I can't see anywhere suitable","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"outdoor_sensitivity","field":"outdoorSensitivity","heading":"How sensitive are you to how it looks outside?","supporting":null,"whyWeAsk":"One larger unit or several smaller ones is a real choice, and it changes which systems suit you.","multiSelect":null,"options":[{"value":"not_particularly","label":"Not particularly","hint":null},{"value":"one_not_several","label":"One unit rather than several","hint":null},{"value":"hidden_as_possible","label":"Hidden as much as possible","hint":null},{"value":"planning_restrictions","label":"Planning or building restrictions","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"home_permanent","field":"permanentChanges","heading":"Can permanent changes be made to the property?","supporting":"For example, drilling through an outside wall or mounting equipment.","whyWeAsk":"Every fixed system needs this. Without it, the honest answer is room units.","multiSelect":null,"options":[{"value":"yes","label":"Yes","hint":null},{"value":"permission","label":"Yes, but I'd need permission","hint":null},{"value":"no","label":"No","hint":null},{"value":"unknown","label":"I'm not sure","hint":null}],"comparison":null},{"id":"constraints","field":"constraints","heading":"Does any of this apply?","supporting":"Pick any. These don't change the recommendation — they change what an installer has to confirm.","whyWeAsk":"They go into your brief, so nobody surveys the property and discovers them on the day.","multiSelect":{"max":5,"min":0,"emptySentinel":"none"},"options":[{"value":"listed_or_conservation","label":"Listed building or conservation area","hint":null},{"value":"leasehold_flat","label":"Leasehold flat","hint":null},{"value":"rented","label":"Rented","hint":null},{"value":"tight_cylinder_space","label":"Space for a hot-water tank is tight","hint":"About 2m² of floor and 2m of height"},{"value":"no_loft_access","label":"The loft isn't accessible","hint":null},{"value":"none","label":"None of these","hint":null}],"comparison":null},{"id":"home_budget","field":"homeBudget","heading":"What level of investment are you considering?","supporting":"We don't publish a price range for whole-home systems — the spread between properties is too wide to be honest about. This just tells us how to weigh the options.","whyWeAsk":"Nothing is ruled out by your answer. You'll see every route either way.","multiSelect":null,"options":[{"value":"lowest_disruption","label":"Prefer the lowest-disruption option","hint":null},{"value":"modest","label":"Keep it as modest as possible","hint":null},{"value":"mid","label":"A mid-range project","hint":null},{"value":"premium","label":"A premium or concealed system, if it's worth it","hint":null},{"value":"show_realistic","label":"Show me the realistic options first","hint":null}],"comparison":null}],"rooms":{"heading":"Which rooms, and roughly how big?","roomTypes":[{"value":"bedroom","label":"Bedroom"},{"value":"living_room","label":"Living room"},{"value":"kitchen_open_plan","label":"Kitchen or open-plan space"},{"value":"home_office","label":"Home office"},{"value":"loft","label":"Loft room"},{"value":"conservatory","label":"Conservatory"},{"value":"other","label":"Other"}],"sizeBands":[{"value":"small","label":"Small","hint":"Box room · under 10 m²"},{"value":"medium","label":"Medium","hint":"Typical bedroom · 10–20 m²"},{"value":"large","label":"Large","hint":"A big bedroom or living room · 20–35 m²"},{"value":"very_large","label":"Very large or open plan","hint":"35 m² and up"},{"value":"unknown","label":"I'm not sure"}],"max":3},"answersSchema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"scope":{"type":"string","enum":["one_room","few_rooms","whole_home"]},"rooms":{"maxItems":3,"type":"array","items":{"type":"object","properties":{"type":{"type":"string","enum":["bedroom","living_room","kitchen_open_plan","home_office","loft","conservatory","other"]},"sizeBand":{"type":"string","enum":["small","medium","large","very_large","unknown"]}},"required":["type","sizeBand"],"additionalProperties":false}},"permanentChanges":{"type":"string","enum":["yes","permission","no","unknown"]},"outdoorUnit":{"type":"string","enum":["yes","probably","no","unknown"]},"windowType":{"type":"string","enum":["vertical_sash","sliding","casement","tilt_turn","other","unknown"]},"usage":{"type":"string","enum":["occasional","summer","frequent","unknown"]},"heating":{"type":"string","enum":["yes","nice_to_have","no"]},"installPreference":{"type":"string","enum":["fixed","removable","either"]},"priority":{"type":"string","enum":["overall","quiet","upfront_cost","running_cost","minimal_work","external_appearance"]},"secondaryPriority":{"type":"string","enum":["overall","quiet","upfront_cost","running_cost","minimal_work","external_appearance"]},"costStance":{"type":"string","enum":["under_500","under_1500","open_to_fixed","unknown"]},"extras":{"maxItems":5,"type":"array","items":{"type":"string","enum":["clean_air","humidity","quiet_night","app_control","discreet"]}},"wholeHome":{"type":"object","properties":{"replaceHeating":{"type":"string","enum":["yes","no","unsure"]},"majorBuildingWork":{"type":"string","enum":["yes","no","maybe"]}},"required":["replaceHeating","majorBuildingWork"],"additionalProperties":false},"home":{"type":"object","properties":{"objective":{"type":"string","enum":["comfort","heating_replacement","renovation","unsure"]},"existingHeating":{"type":"string","enum":["gas_boiler","oil_boiler","lpg_boiler","electric_radiators","storage_heaters","air_to_water","air_to_air","communal","none","other","unknown"]},"heatDistribution":{"type":"string","enum":["radiators","underfloor","mixture","electric_panels","storage","wall_units","warm_air","unknown"]},"hotWater":{"type":"string","enum":["combi","boiler_cylinder","immersion_cylinder","heat_pump_cylinder","communal","instant_electric","other","unknown"]},"retain":{"type":"string","enum":["keep_heating_add_cooling","keep_radiators_replace_boiler","keep_hot_water","replace_everything","show_trade_offs"]},"coverage":{"maxItems":6,"type":"array","items":{"type":"string","enum":["living_areas","bedrooms","kitchen_open_plan","loft_top_floor","conservatory","whole_home","none"]}},"propertyType":{"type":"string","enum":["detached","semi_detached","terraced","bungalow","flat_purpose_built","flat_converted","other"]},"bedrooms":{"anyOf":[{"type":"number","const":1},{"type":"number","const":2},{"type":"number","const":3},{"type":"number","const":4},{"type":"number","const":5}]},"storeys":{"anyOf":[{"type":"number","const":1},{"type":"number","const":2},{"type":"number","const":3}]},"disruption":{"type":"string","enum":["minimal","some","renovating","major","unknown"]},"appearance":{"type":"string","enum":["visible_fine","pay_for_discreet","concealed_only","unknown"]},"concealedSpace":{"type":"string","enum":["loft","ceiling_void","being_created","none","unknown"]},"outdoorLocation":{"maxItems":7,"type":"array","items":{"type":"string","enum":["ground_beside_house","side_passage","external_wall","balcony_terrace","flat_roof","garden_patio","nowhere","unknown"]}},"outdoorSensitivity":{"type":"string","enum":["not_particularly","one_not_several","hidden_as_possible","planning_restrictions","unknown"]},"permanentChanges":{"type":"string","enum":["yes","permission","no","unknown"]},"constraints":{"maxItems":5,"type":"array","items":{"type":"string","enum":["listed_or_conservation","leasehold_flat","rented","tight_cylinder_space","no_loft_access"]}},"budget":{"type":"string","enum":["lowest_disruption","modest","mid","premium","show_realistic"]},"grantCheck":{"type":"object","properties":{"nation":{"type":"string","enum":["england","wales","scotland","northern_ireland","unknown"]},"ownership":{"type":"string","enum":["owner_occupier","landlord","leaseholder","tenant","other","unknown"]},"newBuild":{"anyOf":[{"type":"boolean"},{"type":"string","const":"unknown"}]}},"required":["nation","ownership","newBuild"],"additionalProperties":false},"weighBy":{"type":"string","enum":["overall","lowest_disruption","lowest_upfront_cost","lowest_running_cost","best_cooling","most_discreet","best_complete_replacement"]}},"required":["objective","existingHeating","hotWater","coverage","propertyType","bedrooms","disruption","appearance","outdoorLocation","permanentChanges","budget"],"additionalProperties":false}},"required":["scope","rooms","permanentChanges","outdoorUnit","priority"],"additionalProperties":false},"commonSituations":[{"slug":"rented-flat-no-permanent-changes","situation":"A 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