diff --git a/public/js/appChart.js b/public/js/appChart.js
index 924d98cdc802cc15caec6729d7f7582bf9dd8e8b..7e4047912e90616217ea8c1945d8709cf9b7bfa4 100644
--- a/public/js/appChart.js
+++ b/public/js/appChart.js
@@ -18,370 +18,6 @@ const BASE_URL2 =
 const PARAM_FILTER2 =
   "resultTime ge 2020-06-01T00:00:00.000Z and resultTime le 2021-01-01T00:00:00.000Z";
 
-/**
- * Draw an EMPTY chart using Apexcharts library
- * @param {HTMLElement} htmlElement - HTML element where chart will be drawn
- * @param {String} mainTitle - Main chart title
- * @param {String} yAxisTitle - Y-axis title
- * @returns {Object} - An empty chart object
- */
-const drawEmptyLineChartAC = function (
-  htmlElement,
-  mainTitle = "Main Chart Title",
-  yAxisTitle = "y-axis title"
-) {
-  // Chart constants
-  const CHART_HTML_ELEMENT = htmlElement;
-  const TITLE_TEXT = mainTitle;
-  const Y_AXIS_TITLE = yAxisTitle;
-
-  const options = {
-    series: [],
-    chart: {
-      type: "area",
-      stacked: false,
-      height: 350,
-      zoom: {
-        type: "x",
-        enabled: true,
-        autoScaleYaxis: true,
-      },
-      toolbar: {
-        autoSelected: "zoom",
-      },
-    },
-    dataLabels: {
-      enabled: false,
-    },
-    markers: {
-      size: 0,
-    },
-    title: {
-      text: TITLE_TEXT,
-      align: "left",
-    },
-    noData: {
-      text: "Loading...",
-    },
-    fill: {
-      type: "gradient",
-      gradient: {
-        shadeIntensity: 1,
-        inverseColors: false,
-        opacityFrom: 0.5,
-        opacityTo: 0,
-        stops: [0, 90, 100],
-      },
-    },
-    yaxis: {
-      labels: {
-        formatter: function (val) {
-          return val.toFixed(0);
-        },
-        forceNiceScale: true,
-      },
-      title: {
-        text: Y_AXIS_TITLE,
-      },
-    },
-    xaxis: {
-      type: "datetime",
-    },
-    tooltip: {
-      shared: false,
-      y: {
-        formatter: function (val) {
-          return val.toFixed(2);
-        },
-      },
-    },
-  };
-
-  const chart = new ApexCharts(CHART_HTML_ELEMENT, options);
-  return chart;
-};
-
-// Line chart 1 constants
-const chart1LineHTML = document.querySelector("#chart-line");
-const chart1LineTitle = "Inlet flow (Vorlauf)";
-const chart1LineYAxisTitle = "Temperature (°C)";
-
-// Draw an empty line chart
-const lineChartApex = drawEmptyLineChartAC(
-  chart1LineHTML,
-  chart1LineTitle,
-  chart1LineYAxisTitle
-);
-lineChartApex.render();
-
-/**
- * Update an empty chart created using Apexcharts library
- * @param {String} chartName
- * @param {Array} dataArr
- * @returns {void}
- */
-const updateLineChartAC = function (chartName, dataArr) {
-  const CHART_NAME = chartName;
-  // Update the chart
-  lineChartApex.updateSeries([
-    {
-      name: CHART_NAME,
-      data: dataArr,
-    },
-  ]);
-};
-
-/**
- * Draw a heatmap using the ApexCharts library
- * ATTEMPT 1
- * @param {Array} obsArray - Response from SensorThings API as array
- * @returns {void}
- */
-const drawHeatMapAC1 = function (obsArray) {
-  // Chart constants
-  const CHART_HEATMAP_TITLE = "HeatMap Chart";
-  const CHART_HEATMAP_NAME_SERIES_1 = "VL-225";
-  // const CHART_HEATMAP_NAME_SERIES_2 = "W2";
-
-  /**
-   * Convert SensorThings API response (an array) into an object
-   * @returns {Object} - Chart series object
-   */
-  const generateHeatMapData = function () {
-    const series = [];
-    obsArray.forEach(([obsTime, obsValue]) => {
-      series.push({
-        x: obsTime.slice(0, -1), // remove trailing "Z" from timestamp
-        y: obsValue,
-      });
-    });
-    return series;
-  };
-
-  const data = [
-    {
-      name: CHART_HEATMAP_NAME_SERIES_1,
-      data: generateHeatMapData(obsArray),
-    },
-    // {
-    //   name: CHART_HEATMAP_NAME_SERIES_2,
-    //   data: generateHeatMapData(obsArray),
-    // },
-  ];
-
-  data.reverse();
-
-  const colors = [
-    "#F3B415",
-    "#F27036",
-    "#663F59",
-    "#6A6E94",
-    "#4E88B4",
-    "#00A7C6",
-    "#18D8D8",
-    "#A9D794",
-    "#46AF78",
-    "#A93F55",
-    "#8C5E58",
-    "#2176FF",
-    "#33A1FD",
-    "#7A918D",
-    "#BAFF29",
-  ];
-
-  // colors.reverse();
-
-  const options = {
-    series: data,
-    chart: {
-      height: 350,
-      type: "heatmap",
-    },
-    dataLabels: {
-      enabled: false,
-    },
-    colors: colors,
-
-    title: {
-      text: CHART_HEATMAP_TITLE,
-    },
-    grid: {
-      padding: {
-        right: 20,
-      },
-    },
-    xaxis: {
-      type: "datetime",
-    },
-    tooltip: {
-      shared: false,
-      x: {
-        formatter: function (val) {
-          return new Date(val).toLocaleString();
-        },
-      },
-      y: {
-        formatter: function (val) {
-          return val.toFixed(2);
-        },
-      },
-    },
-    plotOptions: {
-      heatmap: {
-        useFillColorAsStroke: true, // we need this option for the chart to be visible
-        // distributed: true,
-        // enableShades: false,
-      },
-    },
-  };
-
-  const chart = new ApexCharts(
-    document.querySelector("#chart-apex-heatmap"),
-    options
-  );
-  chart.render();
-};
-
-/**
- * Draw a heatmap using the ApexCharts library
- * ATTEMPT 2
- * @param {Array} obsArray - Response from SensorThings API as array
- * @returns {void}
- */
-const drawHeatMapAC2 = function (obsArray) {
-  // Chart constants
-  const CHART_HEATMAP_TITLE = "HeatMap Chart";
-  const CHART_HEATMAP_NAME_SERIES_1 = "VL-225";
-
-  /**
-   * Convert SensorThings API response (an array) into an object
-   * @returns {Object} - Chart series object
-   */
-  const generateHeatMapData = function () {
-    const series = [];
-    obsArray.forEach(([obsTime, obsValue]) => {
-      series.push({
-        x: obsTime.slice(0, -1), // remove trailing "Z" from timestamp
-        y: obsValue,
-      });
-    });
-    return series;
-  };
-
-  const data = [
-    {
-      name: CHART_HEATMAP_NAME_SERIES_1,
-      data: generateHeatMapData(obsArray),
-    },
-    // {
-    //   name: CHART_HEATMAP_NAME_SERIES_2,
-    //   data: generateHeatMapData(obsArray),
-    // },
-  ];
-
-  // Constants for our data range
-  const LOW_FROM = 65;
-  const LOW_TO = 70;
-  const MEDIUM_FROM = 70;
-  const MEDIUM_TO = 75;
-  const HIGH_FROM = 75;
-  const HIGH_TO = 80;
-  const EXTREME_FROM = 80;
-  const EXTREME_TO = 85;
-  const options = {
-    series: data,
-    chart: {
-      height: 450,
-      type: "heatmap",
-    },
-    plotOptions: {
-      heatmap: {
-        shadeIntensity: 0.5,
-        radius: 0,
-        useFillColorAsStroke: true,
-        colorScale: {
-          ranges: [
-            {
-              from: null,
-              to: null,
-              name: "null",
-              color: "#525252",
-            },
-            {
-              from: LOW_FROM,
-              to: LOW_TO,
-              name: `${LOW_FROM}°C`,
-              color: "#1a9641",
-            },
-            {
-              from: MEDIUM_FROM,
-              to: MEDIUM_TO,
-              name: `${MEDIUM_FROM}°C`,
-              color: "#a6d96a",
-            },
-            {
-              from: HIGH_FROM,
-              to: HIGH_TO,
-              name: `${HIGH_FROM}°C`,
-              color: "#fdae61",
-            },
-            {
-              from: EXTREME_FROM,
-              to: EXTREME_TO,
-              name: `${EXTREME_FROM}°C`,
-              color: "#d7191c",
-            },
-          ],
-        },
-      },
-    },
-    dataLabels: {
-      enabled: false,
-    },
-    stroke: {
-      width: 1,
-    },
-    title: {
-      text: CHART_HEATMAP_TITLE,
-    },
-    grid: {
-      padding: {
-        right: 20,
-      },
-    },
-    xaxis: {
-      type: "datetime",
-      // labels: {
-      //   format: "MMM",
-      // },
-    },
-    tooltip: {
-      shared: false,
-      x: {
-        formatter: function (val) {
-          return new Date(val).toLocaleString();
-        },
-      },
-      y: {
-        formatter: function (val) {
-          if (val) {
-            return val.toFixed(2);
-          } else {
-            return "null";
-          }
-        },
-      },
-    },
-    // distributed: true,
-  };
-
-  const chart = new ApexCharts(
-    document.querySelector("#chart-heatmap"),
-    options
-  );
-  chart.render();
-};
-
 /**
  * Draw a heatmap using Highcharts library
  * @param {*} obsArray - Response from SensorThings API as array
@@ -564,7 +200,6 @@ followNextLink(
     console.log(err);
   })
   .then((observationArr) => {
-    // updateLineChartAC(chart1LineTitle, observationArr);
     // drawHeatMapAC2(observationArr);
     drawHeatMapHC(observationArr);
   });