diff --git a/src/components/Options/ProfileTypeOptions.tsx b/src/components/Options/ProfileTypeOptions.tsx
index 1583af0f45a672fc6259bbfaf1b96b53e190d7e3..f3fde3a9fa7a89176581c56d5e79d222c4873fb8 100644
--- a/src/components/Options/ProfileTypeOptions.tsx
+++ b/src/components/Options/ProfileTypeOptions.tsx
@@ -6,7 +6,11 @@ import StyledCard from 'components/CommonKit/Card/StyledCard'
 import StyledIcon from 'components/CommonKit/Icon/StyledIcon'
 import profileIcon from 'assets/icons/ico/profile.svg'
 import './profileTypeOptions.scss'
-import { IndividualOrCollective, HousingType } from 'enum/profileType.enum'
+import {
+  IndividualOrCollective,
+  HousingType,
+  ThreeChoicesAnswer,
+} from 'enum/profileType.enum'
 import { FluidType } from 'enum/fluid.enum'
 import { useHistory } from 'react-router-dom'
 
@@ -95,39 +99,39 @@ const ProfileTypeOptions: React.FC = () => {
                     )}
                   </ul>
                 </div>
-                <div className="fields">
-                  <div className="label">
-                    {t('profile_type.title_facilities_installation')}
+                {profile.profileType.hasInstalledVentilation ===
+                  ThreeChoicesAnswer.YES ||
+                profile.profileType.hasReplacedHeater ===
+                  ThreeChoicesAnswer.YES ? (
+                  <div className="fields">
+                    <div className="label">
+                      {t('profile_type.title_facilities_installation')}
+                    </div>
+                    <ul className="value">
+                      <li>
+                        {profile.profileType.hasInstalledVentilation ===
+                          ThreeChoicesAnswer.YES &&
+                          t(`profile_type.title_ventilation`)}
+                      </li>
+                      <li>
+                        {profile.profileType.hasReplacedHeater ===
+                          ThreeChoicesAnswer.YES &&
+                          t(`profile_type.title_heater_replacement`)}
+                      </li>
+                    </ul>
                   </div>
-                  <ul className="value">
-                    {profile.profileType.facilitiesInstallation.map(
-                      (equipment, index) => {
-                        return (
-                          <li key={index}>
-                            {t(
-                              `profile_type.facilities_installation.${equipment}`
-                            )}
-                          </li>
-                        )
-                      }
-                    )}
-                  </ul>
-                </div>
+                ) : (
+                  ''
+                )}
                 <div className="fields">
                   <div className="label">
                     {t('profile_type.title_hot_water_equipment')}
                   </div>
-                  <ul className="value">
-                    {profile.profileType.hotWaterEquipment.map(
-                      (equipment, index) => {
-                        return (
-                          <li key={index}>
-                            {t(`profile_type.hot_water_equipment.${equipment}`)}
-                          </li>
-                        )
-                      }
+                  <div className="value">
+                    {t(
+                      `profile_type.hot_water_equipment.${profile.profileType.hotWaterEquipment}`
                     )}
-                  </ul>
+                  </div>
                 </div>
                 {profile.profileType.warmingFluid !== null && (
                   <div className="fields">
diff --git a/src/components/ProfileType/ProfileTypeView.tsx b/src/components/ProfileType/ProfileTypeView.tsx
index 0f2edca3f157ecf96987cdc8c7474ba657e02d02..0fedddde479a8e4f46bff148be37f3c4413870f3 100644
--- a/src/components/ProfileType/ProfileTypeView.tsx
+++ b/src/components/ProfileType/ProfileTypeView.tsx
@@ -9,7 +9,6 @@ import ProfileTypeFormEnd from 'components/ProfileType/ProfileTypeFinished'
 import { ProfileType, ProfileTypeAnswer } from 'models/profileType.model'
 import {
   ConstructionYear,
-  FacilitiesInstallation,
   Floor,
   HotWaterEquipment,
   HousingType,
@@ -17,6 +16,7 @@ import {
   IndividualOrCollective,
   OutsideFacingWalls,
   ProfileTypeFormType,
+  ThreeChoicesAnswer,
 } from 'enum/profileType.enum'
 import { FluidType } from 'enum/fluid.enum'
 import { ProfileTypeStepForm } from 'enum/profileType.enum'
@@ -36,9 +36,10 @@ const ProfileTypeView = () => {
     floor: Floor.NOT_APPLICABLE,
     heating: IndividualOrCollective.INDIVIDUAL,
     individualInsulationWork: [IndividualInsulationWork.NONE],
-    facilitiesInstallation: [FacilitiesInstallation.NONE],
+    hasInstalledVentilation: ThreeChoicesAnswer.UNKWOWN,
+    hasReplacedHeater: ThreeChoicesAnswer.UNKWOWN,
     hotWater: IndividualOrCollective.INDIVIDUAL,
-    hotWaterEquipment: [HotWaterEquipment.OTHER],
+    hotWaterEquipment: HotWaterEquipment.OTHER,
     warmingFluid: FluidType.ELECTRICITY,
     hotWaterFluid: FluidType.ELECTRICITY,
     cookingFluid: FluidType.ELECTRICITY,
diff --git a/src/enum/profileType.enum.ts b/src/enum/profileType.enum.ts
index a60de8e23764bad5355180190bf3c58b6f15e74f..9791d5e7eaa81370ab93d9edc8209be47df7dfbb 100644
--- a/src/enum/profileType.enum.ts
+++ b/src/enum/profileType.enum.ts
@@ -36,13 +36,19 @@ export enum IndividualInsulationWork {
   WALL_INSULATION = 'wall_insulation',
 }
 
-export enum FacilitiesInstallation {
-  NONE = 'none',
-  COLLECTIVE_HEATER = 'collective_heater',
-  INDIVIDUAL_HEATER = 'individual_heater',
-  INDIVIDUAL_VENTILATION = 'individual_ventilation',
+export enum ThreeChoicesAnswer {
+  YES = 'yes',
+  NO = 'no',
+  UNKWOWN = 'unknown',
 }
 
+// export enum FacilitiesInstallation {
+//   NONE = 'none',
+//   COLLECTIVE_HEATER = 'collective_heater',
+//   INDIVIDUAL_HEATER = 'individual_heater',
+//   INDIVIDUAL_VENTILATION = 'individual_ventilation',
+// }
+
 export enum HotWaterEquipment {
   SOLAR = 'solar',
   THERMODYNAMIC = 'thermodynamic',
@@ -51,20 +57,21 @@ export enum HotWaterEquipment {
 
 export enum ProfileTypeStepForm {
   HOUSING_TYPE = 0,
-  CONSTRUCTION_YEAR = 1,
-  AREA = 2,
-  OCCUPANTS_NUMBER = 3,
+  AREA = 1,
+  OCCUPANTS_NUMBER = 2,
+  CONSTRUCTION_YEAR = 3,
   OUTSIDE_FACING_WALLS = 4,
   FLOOR = 5,
   HEATING = 6,
   WARMING_FLUID = 7,
   INDIVIDUAL_INSULATION_WORK = 8,
-  FACILITIES_INSTALLATION = 9,
-  HOT_WATER = 10,
-  HOT_WATER_FLUID = 11,
-  HOT_WATER_EQUIPMENT = 12,
-  COOKING_FLUID = 13,
-  END = 14,
+  VENTILATION = 9,
+  HEATER_REPLACEMENT = 10,
+  HOT_WATER = 11,
+  HOT_WATER_FLUID = 12,
+  HOT_WATER_EQUIPMENT = 13,
+  COOKING_FLUID = 14,
+  END = 15,
 }
 
 export enum ProfileTypeFormType {
diff --git a/src/locales/fr.json b/src/locales/fr.json
index 86df6f301ebfa46d54aabd0e27826f4ac68bb32b..e30f5d7e301ed6ea5854d68ef8c66ee2154d446c 100644
--- a/src/locales/fr.json
+++ b/src/locales/fr.json
@@ -465,13 +465,19 @@
       "built_after_1998": "construit après 1998"
     },
     "title_facilities_installation": "Équipement",
-    "facilities_installation": {
-      "question": "Quel équipement a été installé ou remplacé ces 10 dernières années ?",
-      "none": "Aucun",
-      "collective_heater": "Chauffage collectif",
-      "individual_heater": "Chauffage individuel",
-      "individual_ventilation": "Ventilation double flux individuel",
-      "individual_heater_and_ventilation": "Chauffage et ventilation individuel"
+    "title_ventilation": "Ventilation double flux",
+    "ventilation": {
+      "question": "Etes-vous équipé d'une ventialtion double flux ?",
+      "yes": "Oui",
+      "no": "Non",
+      "unknown": "Je ne sais pas"
+    },
+    "title_heater_replacement": "Pompe à chaleur ou poêle à bois",
+    "heater_replacement": {
+      "question": "Au cours de ces 10 dernières années, avez-vous remplacé votre chaudière ou vous êtes-vous équipé d'une pompe à chaleur ou d'un poêle à bois ?",
+      "yes": "Oui",
+      "no": "Non",
+      "unknown": "Je ne sais pas"
     },
     "title_hotWaterEquipment": "Eau chaude",
     "hot_water": {
@@ -481,9 +487,9 @@
     },
     "hot_water_equipment": {
       "question": "Quel équipement utilisez-vous pour produire votre eau chaude ?",
-      "solar": "Solaire",
-      "thermodynamic": "Thermodynamique",
-      "other": "Autre"
+      "solar": "Chauffe-eau solaire",
+      "thermodynamic": "Chauffe-eau thermodynamique",
+      "other": "Ni l'un ni l'autre"
     },
     "title_hot_water_equipment": "Eau chaude",
     "title_heating_source": "Source chauffage",
diff --git a/src/models/profileType.model.ts b/src/models/profileType.model.ts
index 9e0cc3240f2cea48c1cf74c77856dff1407f0ed8..50028e8d96e6035a0ae11a5da3be8a08f84e7106 100644
--- a/src/models/profileType.model.ts
+++ b/src/models/profileType.model.ts
@@ -3,11 +3,11 @@ import {
   Floor,
   ConstructionYear,
   IndividualInsulationWork,
-  FacilitiesInstallation,
   HotWaterEquipment,
   OutsideFacingWalls,
   IndividualOrCollective,
   ProfileTypeFormType,
+  ThreeChoicesAnswer,
 } from 'enum/profileType.enum'
 import { FluidType } from 'enum/fluid.enum'
 
@@ -19,8 +19,8 @@ interface ProfileTypeIndexableTypes {
     | Floor
     | IndividualOrCollective
     | IndividualInsulationWork[]
-    | FacilitiesInstallation[]
-    | HotWaterEquipment[]
+    | ThreeChoicesAnswer
+    | HotWaterEquipment
     | FluidType
     | number
     | string
@@ -36,8 +36,9 @@ export interface ProfileType extends ProfileTypeIndexableTypes {
   heating: IndividualOrCollective
   hotWater: IndividualOrCollective
   individualInsulationWork: IndividualInsulationWork[]
-  facilitiesInstallation: FacilitiesInstallation[]
-  hotWaterEquipment: HotWaterEquipment[]
+  hasInstalledVentilation: ThreeChoicesAnswer
+  hasReplacedHeater: ThreeChoicesAnswer
+  hotWaterEquipment: HotWaterEquipment
   warmingFluid: FluidType | null
   hotWaterFluid: FluidType | null
   cookingFluid: FluidType
@@ -71,8 +72,8 @@ export type ProfileTypeAnswerChoices =
   | Floor
   | IndividualOrCollective
   | IndividualInsulationWork[]
-  | FacilitiesInstallation[]
-  | HotWaterEquipment[]
+  | ThreeChoicesAnswer
+  | HotWaterEquipment
   | FluidType
   | null
 export interface ProfileTypeAnswer {
diff --git a/src/services/profileType.service.ts b/src/services/profileType.service.ts
index 572c490e4951dc2acfa40b6489b10cf22c86b847..7a1aeaa6c6502d68416608f121b2fc7e52a00937 100644
--- a/src/services/profileType.service.ts
+++ b/src/services/profileType.service.ts
@@ -13,7 +13,6 @@ import coldWaterData from 'constants/consumptionConstants/coldWater.json'
 import EcsData from 'constants/consumptionConstants/ecs.json'
 import {
   ConstructionYear,
-  FacilitiesInstallation,
   Floor,
   IndividualOrCollective,
   HotWaterEquipment,
@@ -22,6 +21,7 @@ import {
   OutsideFacingWalls,
   ProfileTypeStepForm,
   ProfileTypeFormType,
+  ThreeChoicesAnswer,
 } from 'enum/profileType.enum'
 import { FluidType } from 'enum/fluid.enum'
 import ConverterService from './converter.service'
@@ -62,8 +62,10 @@ export default class ProfileTypeService {
     const constructionYear: ConstructionYear = this.profileType.constructionYear
     const individualInsulationWork: IndividualInsulationWork[] = this
       .profileType.individualInsulationWork
-    const facilitiesInstallation: FacilitiesInstallation[] = this.profileType
-      .facilitiesInstallation
+    const hasInstalledVentilation: ThreeChoicesAnswer = this.profileType
+      .hasInstalledVentilation
+    const hasReplacedHeater: ThreeChoicesAnswer = this.profileType
+      .hasReplacedHeater
     const heating = this.profileType.heating
 
     //Apply corrections
@@ -136,17 +138,21 @@ export default class ProfileTypeService {
     } else correctionInsulation = 0
 
     if (
-      !facilitiesInstallation.includes(FacilitiesInstallation.NONE) &&
+      hasInstalledVentilation === ThreeChoicesAnswer.YES &&
+      hasReplacedHeater === ThreeChoicesAnswer.YES &&
       heating !== IndividualOrCollective.COLLECTIVE
     ) {
-      if (facilitiesInstallation.length === 1) {
-        correctionFacilities =
-          heatingData.adjustment_facilities[facilitiesInstallation[0]]
-      } else {
-        correctionFacilities =
-          heatingData.adjustment_facilities['individual_heater_and_ventilation']
-      }
-    } else correctionFacilities = 0
+      correctionFacilities =
+        heatingData.adjustment_facilities['individual_heater_and_ventilation']
+    } else if (hasReplacedHeater === ThreeChoicesAnswer.YES) {
+      correctionFacilities =
+        heatingData.adjustment_facilities['individual_heater']
+    } else if (hasInstalledVentilation === ThreeChoicesAnswer.YES) {
+      correctionFacilities =
+        heatingData.adjustment_facilities['individual_ventilation']
+    } else {
+      correctionFacilities = 0
+    }
 
     const correctedConsumption =
       estimatedConsumption *
@@ -464,12 +470,12 @@ export default class ProfileTypeService {
   public getNextFormStep(step: ProfileTypeStepForm): ProfileTypeStepForm {
     switch (step) {
       case ProfileTypeStepForm.HOUSING_TYPE:
-        return ProfileTypeStepForm.CONSTRUCTION_YEAR
-      case ProfileTypeStepForm.CONSTRUCTION_YEAR:
         return ProfileTypeStepForm.AREA
       case ProfileTypeStepForm.AREA:
         return ProfileTypeStepForm.OCCUPANTS_NUMBER
       case ProfileTypeStepForm.OCCUPANTS_NUMBER:
+        return ProfileTypeStepForm.CONSTRUCTION_YEAR
+      case ProfileTypeStepForm.CONSTRUCTION_YEAR:
         return ProfileTypeStepForm.OUTSIDE_FACING_WALLS
       case ProfileTypeStepForm.OUTSIDE_FACING_WALLS:
         return this.profileType.housingType === HousingType.INDIVIDUAL_HOUSE
@@ -483,11 +489,13 @@ export default class ProfileTypeService {
           : ProfileTypeStepForm.HOT_WATER
       case ProfileTypeStepForm.WARMING_FLUID:
         return this.profileType.constructionYear === ConstructionYear.AFTER_1999
-          ? ProfileTypeStepForm.FACILITIES_INSTALLATION
+          ? ProfileTypeStepForm.VENTILATION
           : ProfileTypeStepForm.INDIVIDUAL_INSULATION_WORK
       case ProfileTypeStepForm.INDIVIDUAL_INSULATION_WORK:
-        return ProfileTypeStepForm.FACILITIES_INSTALLATION
-      case ProfileTypeStepForm.FACILITIES_INSTALLATION:
+        return ProfileTypeStepForm.VENTILATION
+      case ProfileTypeStepForm.VENTILATION:
+        return ProfileTypeStepForm.HEATER_REPLACEMENT
+      case ProfileTypeStepForm.HEATER_REPLACEMENT:
         return this.profileType.housingType === HousingType.INDIVIDUAL_HOUSE
           ? ProfileTypeStepForm.HOT_WATER_FLUID
           : ProfileTypeStepForm.HOT_WATER
@@ -513,14 +521,14 @@ export default class ProfileTypeService {
    */
   public getPreviousFormStep(step: ProfileTypeStepForm): ProfileTypeStepForm {
     switch (step) {
-      case ProfileTypeStepForm.CONSTRUCTION_YEAR:
-        return ProfileTypeStepForm.HOUSING_TYPE
       case ProfileTypeStepForm.AREA:
-        return ProfileTypeStepForm.CONSTRUCTION_YEAR
+        return ProfileTypeStepForm.HOUSING_TYPE
       case ProfileTypeStepForm.OCCUPANTS_NUMBER:
         return ProfileTypeStepForm.AREA
-      case ProfileTypeStepForm.OUTSIDE_FACING_WALLS:
+      case ProfileTypeStepForm.CONSTRUCTION_YEAR:
         return ProfileTypeStepForm.OCCUPANTS_NUMBER
+      case ProfileTypeStepForm.OUTSIDE_FACING_WALLS:
+        return ProfileTypeStepForm.CONSTRUCTION_YEAR
       case ProfileTypeStepForm.FLOOR:
         return ProfileTypeStepForm.OUTSIDE_FACING_WALLS
       case ProfileTypeStepForm.HEATING:
@@ -531,17 +539,19 @@ export default class ProfileTypeService {
           : ProfileTypeStepForm.HEATING
       case ProfileTypeStepForm.INDIVIDUAL_INSULATION_WORK:
         return ProfileTypeStepForm.WARMING_FLUID
-      case ProfileTypeStepForm.FACILITIES_INSTALLATION:
+      case ProfileTypeStepForm.VENTILATION:
         return this.profileType.constructionYear === ConstructionYear.AFTER_1999
           ? ProfileTypeStepForm.WARMING_FLUID
           : ProfileTypeStepForm.INDIVIDUAL_INSULATION_WORK
+      case ProfileTypeStepForm.HEATER_REPLACEMENT:
+        return ProfileTypeStepForm.VENTILATION
       case ProfileTypeStepForm.HOT_WATER:
         return this.profileType.heating === IndividualOrCollective.INDIVIDUAL
-          ? ProfileTypeStepForm.FACILITIES_INSTALLATION
+          ? ProfileTypeStepForm.HEATER_REPLACEMENT
           : ProfileTypeStepForm.HEATING
       case ProfileTypeStepForm.HOT_WATER_FLUID:
         return this.profileType.housingType === HousingType.INDIVIDUAL_HOUSE
-          ? ProfileTypeStepForm.FACILITIES_INSTALLATION
+          ? ProfileTypeStepForm.HEATER_REPLACEMENT
           : ProfileTypeStepForm.HOT_WATER
       case ProfileTypeStepForm.HOT_WATER_EQUIPMENT:
         return ProfileTypeStepForm.HOT_WATER_FLUID
@@ -589,7 +599,7 @@ export default class ProfileTypeService {
         return {
           type: ProfileTypeFormType.NUMBER_SELECTION,
           attribute: 'outsideFacingWalls',
-          choices: [0, 1, 2, 3, 4],
+          choices: [1, 2, 3, 4],
         }
       case ProfileTypeStepForm.FLOOR:
         return {
@@ -609,11 +619,17 @@ export default class ProfileTypeService {
           attribute: 'individualInsulationWork',
           choices: Object.values(IndividualInsulationWork),
         }
-      case ProfileTypeStepForm.FACILITIES_INSTALLATION:
+      case ProfileTypeStepForm.VENTILATION:
         return {
-          type: ProfileTypeFormType.MULTI_CHOICE,
-          attribute: 'facilitiesInstallation',
-          choices: Object.values(FacilitiesInstallation),
+          type: ProfileTypeFormType.SINGLE_CHOICE,
+          attribute: 'hasInstalledVentilation',
+          choices: Object.values(ThreeChoicesAnswer),
+        }
+      case ProfileTypeStepForm.HEATER_REPLACEMENT:
+        return {
+          type: ProfileTypeFormType.SINGLE_CHOICE,
+          attribute: 'hasReplacedHeater',
+          choices: Object.values(ThreeChoicesAnswer),
         }
       case ProfileTypeStepForm.HOT_WATER:
         return {
@@ -623,7 +639,7 @@ export default class ProfileTypeService {
         }
       case ProfileTypeStepForm.HOT_WATER_EQUIPMENT:
         return {
-          type: ProfileTypeFormType.MULTI_CHOICE,
+          type: ProfileTypeFormType.SINGLE_CHOICE,
           attribute: 'hotWaterEquipment',
           choices: Object.values(HotWaterEquipment),
         }
@@ -673,7 +689,7 @@ export default class ProfileTypeService {
       }
       if (profileType.hotWater === IndividualOrCollective.COLLECTIVE) {
         profileType.hotWaterFluid = null
-        profileType.hotWaterEquipment = []
+        profileType.hotWaterEquipment = HotWaterEquipment.OTHER
       }
     }
     return profileType
diff --git a/src/store/profile/profile.reducer.ts b/src/store/profile/profile.reducer.ts
index 08b99d6f629cb488c7e052e3aaf827f5451e1710..dc50c96752c1c5b1493afeeb6f733663a8174cae 100644
--- a/src/store/profile/profile.reducer.ts
+++ b/src/store/profile/profile.reducer.ts
@@ -7,13 +7,13 @@ import { Profile } from 'models'
 import { DateTime } from 'luxon'
 import {
   ConstructionYear,
-  FacilitiesInstallation,
   Floor,
   HotWaterEquipment,
   HousingType,
   IndividualInsulationWork,
   IndividualOrCollective,
   OutsideFacingWalls,
+  ThreeChoicesAnswer,
 } from 'enum/profileType.enum'
 import { FluidType } from 'enum/fluid.enum'
 
@@ -45,8 +45,9 @@ const initialState: Profile = {
       IndividualInsulationWork.WINDOW_REPLACEMENT,
       IndividualInsulationWork.WALL_INSULATION,
     ],
-    facilitiesInstallation: [FacilitiesInstallation.NONE],
-    hotWaterEquipment: [HotWaterEquipment.SOLAR],
+    hasInstalledVentilation: ThreeChoicesAnswer.UNKWOWN,
+    hasReplacedHeater: ThreeChoicesAnswer.UNKWOWN,
+    hotWaterEquipment: HotWaterEquipment.SOLAR,
     warmingFluid: FluidType.ELECTRICITY,
     hotWaterFluid: FluidType.ELECTRICITY,
     cookingFluid: FluidType.ELECTRICITY,