feat: integrate bettervent.me device database and add BTU/kW unit switcher

Add bettervent.me provider with lazy-cached device list (~6,700 Eurovent-certified heat pumps), search API endpoint, device search UI with auto-populate, BTU/kW unit switcher for European users, and extended AC fields (SEER, SCOP, COP, TOL, Tbiv, refrigerant). Closes #2.
2026-02-11 00:31:39 +01:00
parent 21154d5d7f
commit a334dd57a0
14 changed files with 820 additions and 37 deletions
--- a/web/i18n/de.json
+++ b/web/i18n/de.json
@@ -115,7 +115,24 @@
      "rooms": { "label": "Zugewiesene R\u00e4ume", "tooltip": "Welche R\u00e4ume dieses Klimager\u00e4t versorgt" },
      "add": "Klimager\u00e4t hinzuf\u00fcgen",
      "save": "Klimager\u00e4t speichern",
-      "noItems": "Noch keine Klimager\u00e4te."
+      "noItems": "Noch keine Klimager\u00e4te.",
+      "search": {
+        "label": "Ger\u00e4tedatenbank durchsuchen",
+        "hint": "Daten von bettervent.me (Eurovent-zertifiziert)",
+        "placeholder": "Nach Marke oder Modell suchen...",
+        "noResults": "Keine Ger\u00e4te gefunden"
+      },
+      "unit": {
+        "btuh": "BTU/h",
+        "kw": "kW",
+        "switch": "Einheit wechseln"
+      },
+      "seer": "SEER",
+      "scop": "SCOP",
+      "cop": "COP",
+      "tol": "Min. Betriebstemp.",
+      "tbiv": "Bivalenztemperatur",
+      "refrigerant": "K\u00e4ltemittel"
    },
    "toggles": {
      "title": "Schalter",
@@ -282,7 +299,8 @@
  },
  "footer": {
    "source": "Quellcode",
-    "license": "GPL-3.0-Lizenz"
+    "license": "GPL-3.0-Lizenz",
+    "betterventCredit": "W\u00e4rmepumpendaten bereitgestellt von"
  },
  "common": {
    "save": "Speichern",
--- a/web/i18n/en.json
+++ b/web/i18n/en.json
@@ -115,7 +115,24 @@
      "rooms": { "label": "Assigned Rooms", "tooltip": "Which rooms this AC unit serves" },
      "add": "Add AC Unit",
      "save": "Save AC Unit",
-      "noItems": "No AC units yet."
+      "noItems": "No AC units yet.",
+      "search": {
+        "label": "Search device database",
+        "hint": "Data from bettervent.me (Eurovent certified)",
+        "placeholder": "Search by brand or model...",
+        "noResults": "No devices found"
+      },
+      "unit": {
+        "btuh": "BTU/h",
+        "kw": "kW",
+        "switch": "Switch unit"
+      },
+      "seer": "SEER",
+      "scop": "SCOP",
+      "cop": "COP",
+      "tol": "Min. operating temp",
+      "tbiv": "Bivalent temp",
+      "refrigerant": "Refrigerant"
    },
    "toggles": {
      "title": "Toggles",
@@ -282,7 +299,8 @@
  },
  "footer": {
    "source": "Source Code",
-    "license": "GPL-3.0 License"
+    "license": "GPL-3.0 License",
+    "betterventCredit": "Heat pump data powered by"
  },
  "common": {
    "save": "Save",
--- a/web/js/dashboard.js
+++ b/web/js/dashboard.js
@@ -10,6 +10,14 @@
  let _currentTimezone = null;
  let _currentDashDate = null;

+  const BTU_PER_KW = 3412.14;
+  let _capacityUnit = "btuh";
+
+  function fmtCap(btuh) {
+    if (_capacityUnit === "kw") return (btuh / BTU_PER_KW).toFixed(2) + " kW";
+    return btuh.toFixed(0) + " BTU/h";
+  }
+
  function show(id) { $(id).classList.remove("hidden"); }
  function hide(id) { $(id).classList.add("hidden"); }

@@ -118,6 +126,10 @@
      }
      const data = await resp.json();

+      // Load unit preference
+      const savedUnit = await getSetting("capacityUnit");
+      if (savedUnit === "kw" || savedUnit === "btuh") _capacityUnit = savedUnit;
+
      hide("loading");
      show("data-display");
      await renderDashboard(data);
@@ -361,9 +373,9 @@
        el.querySelector('[data-slot="internal-gains"]').textContent = `${rb.internalGainsW.toFixed(0)} W`;
        el.querySelector('[data-slot="solar-gain"]').textContent = `${rb.solarGainW.toFixed(0)} W`;
        el.querySelector('[data-slot="vent-gain"]').textContent = `${rb.ventGainW.toFixed(0)} W`;
-        el.querySelector('[data-slot="total-gain"]').textContent = `${rb.totalGainBtuh.toFixed(0)} BTU/h`;
-        el.querySelector('[data-slot="ac-capacity"]').textContent = `${rb.acCapacityBtuh.toFixed(0)} BTU/h`;
-        el.querySelector('[data-slot="headroom-value"]').textContent = `${rb.headroomBtuh.toFixed(0)} BTU/h`;
+        el.querySelector('[data-slot="total-gain"]').textContent = fmtCap(rb.totalGainBtuh);
+        el.querySelector('[data-slot="ac-capacity"]').textContent = fmtCap(rb.acCapacityBtuh);
+        el.querySelector('[data-slot="headroom-value"]').textContent = fmtCap(rb.headroomBtuh);

        if (rb.headroomBtuh >= 0) {
          const badEl = el.querySelector('[data-slot="headroom-bad"]');
@@ -372,7 +384,7 @@
          const okEl = el.querySelector('[data-slot="headroom-ok"]');
          if (okEl) okEl.remove();
          const badEl = el.querySelector('[data-slot="headroom-bad"]');
-          badEl.textContent = `${badEl.dataset.label} ${Math.abs(rb.headroomBtuh).toFixed(0)} BTU/h`;
+          badEl.textContent = `${badEl.dataset.label} ${fmtCap(Math.abs(rb.headroomBtuh))}`;
          badEl.classList.remove("hidden");
        }

@@ -386,9 +398,9 @@
        if (rb.thermalMode === "heating" && heatingSection) {
          heatingSection.classList.remove("hidden");
          const ts = t();
-          el.querySelector('[data-slot="heat-deficit"]').textContent = `${(rb.heatDeficitBtuh || 0).toFixed(0)} BTU/h`;
-          el.querySelector('[data-slot="heating-capacity"]').textContent = `${(rb.heatingCapBtuh || 0).toFixed(0)} BTU/h`;
-          el.querySelector('[data-slot="heating-headroom-value"]').textContent = `${(rb.heatingHeadroom || 0).toFixed(0)} BTU/h`;
+          el.querySelector('[data-slot="heat-deficit"]').textContent = fmtCap(rb.heatDeficitBtuh || 0);
+          el.querySelector('[data-slot="heating-capacity"]').textContent = fmtCap(rb.heatingCapBtuh || 0);
+          el.querySelector('[data-slot="heating-headroom-value"]').textContent = fmtCap(rb.heatingHeadroom || 0);
          if ((rb.heatingHeadroom || 0) >= 0) {
            const hbad = el.querySelector('[data-slot="heating-headroom-bad"]');
            if (hbad) hbad.remove();
@@ -397,7 +409,7 @@
            if (hok) hok.remove();
            const hbad = el.querySelector('[data-slot="heating-headroom-bad"]');
            if (hbad) {
-              hbad.textContent = `${hbad.dataset.label} ${Math.abs(rb.heatingHeadroom || 0).toFixed(0)} BTU/h`;
+              hbad.textContent = `${hbad.dataset.label} ${fmtCap(Math.abs(rb.heatingHeadroom || 0))}`;
              hbad.classList.remove("hidden");
            }
          }
--- a/web/js/db.js
+++ b/web/js/db.js
@@ -362,17 +362,28 @@ async function getComputePayload(profileId, dateStr) {
      activityLevel: o.activityLevel || "sedentary",
      vulnerable: !!o.vulnerable,
    })),
-    acUnits: acUnits.map(a => ({
-      id: a.id,
-      profileId: a.profileId,
-      name: a.name,
-      acType: a.acType || "portable",
-      capacityBtu: a.capacityBtu || 0,
-      hasDehumidify: !!a.hasDehumidify,
-      efficiencyEer: a.efficiencyEer || 10,
-      canHeat: !!a.canHeat,
-      heatingCapacityBtu: a.heatingCapacityBtu || 0,
-    })),
+    acUnits: acUnits.map(a => {
+      const unit = {
+        id: a.id,
+        profileId: a.profileId,
+        name: a.name,
+        acType: a.acType || "portable",
+        capacityBtu: a.capacityBtu || 0,
+        hasDehumidify: !!a.hasDehumidify,
+        efficiencyEer: a.efficiencyEer || 10,
+        canHeat: !!a.canHeat,
+        heatingCapacityBtu: a.heatingCapacityBtu || 0,
+      };
+      if (a.seer) unit.seer = a.seer;
+      if (a.seerClass) unit.seerClass = a.seerClass;
+      if (a.scop) unit.scop = a.scop;
+      if (a.scopClass) unit.scopClass = a.scopClass;
+      if (a.cop) unit.cop = a.cop;
+      if (a.tol !== undefined && a.tol !== 0) unit.tol = a.tol;
+      if (a.tbiv !== undefined && a.tbiv !== 0) unit.tbiv = a.tbiv;
+      if (a.refrigerant) unit.refrigerant = a.refrigerant;
+      return unit;
+    }),
    acAssignments: acAssignments.map(a => ({
      acId: a.acId,
      roomId: a.roomId,
--- a/web/js/setup.js
+++ b/web/js/setup.js
@@ -594,6 +594,234 @@
    showToast("Occupant saved", false);
  });

+  // ========== Unit Switcher ==========
+  const BTU_PER_KW = 3412.14;
+  let _capacityUnit = "btuh"; // "btuh" or "kw"
+
+  async function loadCapacityUnit() {
+    const saved = await getSetting("capacityUnit");
+    if (saved === "kw" || saved === "btuh") _capacityUnit = saved;
+    updateUnitToggleUI();
+  }
+
+  function updateUnitToggleUI() {
+    const btn = document.getElementById("ac-unit-toggle");
+    if (!btn) return;
+    btn.dataset.unit = _capacityUnit;
+    btn.textContent = _capacityUnit === "kw" ? "kW" : "BTU/h";
+    if (_capacityUnit === "kw") {
+      btn.classList.add("bg-orange-600", "text-white", "border-orange-600");
+      btn.classList.remove("border-gray-300", "dark:border-gray-600");
+    } else {
+      btn.classList.remove("bg-orange-600", "text-white", "border-orange-600");
+      btn.classList.add("border-gray-300", "dark:border-gray-600");
+    }
+    updateCapacityLabels();
+  }
+
+  function updateCapacityLabels() {
+    const suffix = _capacityUnit === "kw" ? " (kW)" : " (BTU)";
+    const capLabel = document.getElementById("ac-capacity-label");
+    const heatLabel = document.getElementById("ac-heating-capacity-label");
+    if (capLabel) {
+      const tooltip = capLabel.querySelector(".tooltip-trigger");
+      capLabel.textContent = "";
+      capLabel.append((_capacityUnit === "kw" ? "Capacity (kW) " : "Capacity (BTU) "));
+      if (tooltip) capLabel.appendChild(tooltip);
+    }
+    if (heatLabel) {
+      const tooltip = heatLabel.querySelector(".tooltip-trigger");
+      heatLabel.textContent = "";
+      heatLabel.append((_capacityUnit === "kw" ? "Heating Capacity (kW) " : "Heating Capacity (BTU) "));
+      if (tooltip) heatLabel.appendChild(tooltip);
+    }
+    // Update step for inputs
+    const capInput = document.querySelector('#ac-form input[name="capacityBtu"]');
+    const heatInput = document.querySelector('#ac-form input[name="heatingCapacityBtu"]');
+    if (capInput) capInput.step = _capacityUnit === "kw" ? "0.1" : "100";
+    if (heatInput) heatInput.step = _capacityUnit === "kw" ? "0.1" : "100";
+  }
+
+  function displayToUnit(btuValue) {
+    if (_capacityUnit === "kw") return +(btuValue / BTU_PER_KW).toFixed(2);
+    return btuValue;
+  }
+
+  function inputToBtu(inputValue) {
+    if (_capacityUnit === "kw") return +(inputValue * BTU_PER_KW).toFixed(0);
+    return inputValue;
+  }
+
+  function formatCapacity(btuValue) {
+    if (_capacityUnit === "kw") return (btuValue / BTU_PER_KW).toFixed(2) + " kW";
+    return btuValue.toFixed(0) + " BTU";
+  }
+
+  const unitToggle = document.getElementById("ac-unit-toggle");
+  if (unitToggle) {
+    unitToggle.addEventListener("click", async () => {
+      // Convert currently displayed values before switching
+      const capInput = document.querySelector('#ac-form input[name="capacityBtu"]');
+      const heatInput = document.querySelector('#ac-form input[name="heatingCapacityBtu"]');
+
+      const oldUnit = _capacityUnit;
+      _capacityUnit = _capacityUnit === "btuh" ? "kw" : "btuh";
+      await setSetting("capacityUnit", _capacityUnit);
+
+      // Convert displayed values
+      if (capInput && capInput.value) {
+        const raw = parseFloat(capInput.value);
+        if (!isNaN(raw)) {
+          if (oldUnit === "btuh" && _capacityUnit === "kw") capInput.value = (raw / BTU_PER_KW).toFixed(2);
+          else if (oldUnit === "kw" && _capacityUnit === "btuh") capInput.value = Math.round(raw * BTU_PER_KW);
+        }
+      }
+      if (heatInput && heatInput.value) {
+        const raw = parseFloat(heatInput.value);
+        if (!isNaN(raw)) {
+          if (oldUnit === "btuh" && _capacityUnit === "kw") heatInput.value = (raw / BTU_PER_KW).toFixed(2);
+          else if (oldUnit === "kw" && _capacityUnit === "btuh") heatInput.value = Math.round(raw * BTU_PER_KW);
+        }
+      }
+
+      updateUnitToggleUI();
+      await loadACUnits();
+    });
+  }
+
+  // ========== Device Search ==========
+  let _searchTimer = null;
+  const searchInput = document.getElementById("ac-device-search");
+  const searchResults = document.getElementById("ac-search-results");
+
+  if (searchInput) {
+    searchInput.addEventListener("input", () => {
+      if (_searchTimer) clearTimeout(_searchTimer);
+      const q = searchInput.value.trim();
+      if (q.length < 3) {
+        searchResults.classList.add("hidden");
+        return;
+      }
+      _searchTimer = setTimeout(() => doDeviceSearch(q), 300);
+    });
+
+    // Close dropdown on outside click
+    document.addEventListener("click", (e) => {
+      if (!e.target.closest("#ac-device-search") && !e.target.closest("#ac-search-results")) {
+        searchResults.classList.add("hidden");
+      }
+    });
+  }
+
+  async function doDeviceSearch(query) {
+    try {
+      const resp = await fetch(`/api/bettervent/search?q=${encodeURIComponent(query)}`);
+      if (!resp.ok) return;
+      const data = await resp.json();
+      renderSearchResults(data.devices || []);
+    } catch (e) {
+      console.error("Device search error:", e);
+    }
+  }
+
+  function renderSearchResults(devices) {
+    searchResults.replaceChildren();
+    if (devices.length === 0) {
+      const p = document.createElement("div");
+      p.className = "px-3 py-2 text-sm text-gray-400";
+      p.textContent = "No devices found";
+      searchResults.appendChild(p);
+      searchResults.classList.remove("hidden");
+      return;
+    }
+    for (const d of devices) {
+      const item = document.createElement("div");
+      item.className = "px-3 py-2 hover:bg-gray-100 dark:hover:bg-gray-700 cursor-pointer border-b border-gray-100 dark:border-gray-700 last:border-0";
+      item.innerHTML = `<div class="text-sm font-medium">${esc(d.tradeName)} — ${esc(d.modelName)}</div>` +
+        `<div class="text-xs text-gray-400">${d.coolingKw} kW cool / ${d.heatingKw} kW heat · EER ${d.eer} · ${d.seerClass || ""}</div>`;
+      item.addEventListener("click", () => selectDevice(d));
+      searchResults.appendChild(item);
+    }
+    searchResults.classList.remove("hidden");
+  }
+
+  function mapMountingToType(mounting) {
+    const m = (mounting || "").toLowerCase();
+    if (m.includes("wall")) return "split";
+    if (m.includes("floor")) return "portable";
+    if (m.includes("ceiling") || m.includes("cassette")) return "central";
+    if (m.includes("ducted")) return "central";
+    return "split";
+  }
+
+  function selectDevice(d) {
+    const form = document.getElementById("ac-form");
+    form.querySelector('input[name="name"]').value = d.tradeName + " " + d.modelName;
+    form.querySelector('select[name="acType"]').value = mapMountingToType(d.mounting);
+
+    // Capacity: convert kW to appropriate unit
+    const coolBtu = d.coolingKw * BTU_PER_KW;
+    const heatBtu = d.heatingKw * BTU_PER_KW;
+    form.querySelector('input[name="capacityBtu"]').value = _capacityUnit === "kw" ? d.coolingKw.toFixed(2) : Math.round(coolBtu);
+    form.querySelector('input[name="efficiencyEer"]').value = d.eer || 10;
+
+    const canHeatCb = form.querySelector('input[name="canHeat"]');
+    canHeatCb.checked = d.heatingKw > 0;
+    form.querySelector('input[name="heatingCapacityBtu"]').value = _capacityUnit === "kw" ? d.heatingKw.toFixed(2) : Math.round(heatBtu);
+
+    // Store extended fields in form dataset for later save
+    form.dataset.seer = d.seer || "";
+    form.dataset.seerClass = d.seerClass || "";
+    form.dataset.scop = d.scop || "";
+    form.dataset.scopClass = d.scopClass || "";
+    form.dataset.cop = d.cop || "";
+    form.dataset.tol = d.tol || "";
+    form.dataset.tbiv = d.tbiv || "";
+    form.dataset.refrigerant = d.refrigerant || "";
+
+    showExtendedInfo(d);
+
+    // Clear search
+    searchInput.value = "";
+    searchResults.classList.add("hidden");
+  }
+
+  function showExtendedInfo(d) {
+    const el = document.getElementById("ac-extended-info");
+    document.getElementById("ac-extended-title").textContent = (d.tradeName || "") + " " + (d.modelName || d.name || "");
+    document.getElementById("ac-ext-seer").textContent = d.seer ? `${d.seer} (${d.seerClass || ""})` : "—";
+    document.getElementById("ac-ext-scop").textContent = d.scop ? `${d.scop} (${d.scopClass || ""})` : "—";
+    document.getElementById("ac-ext-cop").textContent = d.cop || "—";
+    document.getElementById("ac-ext-tol").textContent = d.tol ? `${d.tol}\u00b0C` : "—";
+    document.getElementById("ac-ext-tbiv").textContent = d.tbiv ? `${d.tbiv}\u00b0C` : "—";
+    document.getElementById("ac-ext-refrigerant").textContent = d.refrigerant || "—";
+    el.classList.remove("hidden");
+  }
+
+  function hideExtendedInfo() {
+    document.getElementById("ac-extended-info").classList.add("hidden");
+  }
+
+  function clearACExtendedData() {
+    const form = document.getElementById("ac-form");
+    delete form.dataset.seer;
+    delete form.dataset.seerClass;
+    delete form.dataset.scop;
+    delete form.dataset.scopClass;
+    delete form.dataset.cop;
+    delete form.dataset.tol;
+    delete form.dataset.tbiv;
+    delete form.dataset.refrigerant;
+    hideExtendedInfo();
+  }
+
+  function esc(s) {
+    if (!s) return "";
+    const d = document.createElement("div");
+    d.textContent = s;
+    return d.innerHTML;
+  }
+
  // ========== AC Units ==========
  async function loadACUnits() {
    const profileId = await getActiveProfileId();
@@ -614,8 +842,10 @@
      const roomIds = assignments.filter(a => a.acId === u.id).map(a => a.roomId);
      const roomNames = roomIds.map(id => roomMap[id] || `Room ${id}`).join(", ");
      el.querySelector('[data-slot="name"]').textContent = u.name;
-      const heatInfo = u.canHeat ? ` \u00b7 Heat ${u.heatingCapacityBtu || u.capacityBtu} BTU` : '';
-      el.querySelector('[data-slot="details"]').textContent = `${u.capacityBtu} BTU \u00b7 ${u.acType}${heatInfo}${roomNames ? ' \u00b7 ' + roomNames : ''}`;
+      const capStr = formatCapacity(u.capacityBtu);
+      const heatInfo = u.canHeat ? ` \u00b7 Heat ${formatCapacity(u.heatingCapacityBtu || u.capacityBtu)}` : '';
+      const seerInfo = u.seer ? ` \u00b7 SEER ${u.seer}` : '';
+      el.querySelector('[data-slot="details"]').textContent = `${capStr} \u00b7 ${u.acType}${heatInfo}${seerInfo}${roomNames ? ' \u00b7 ' + roomNames : ''}`;
      el.firstElementChild.dataset.id = u.id;
      list.appendChild(el);
    }
@@ -628,11 +858,25 @@
    form.querySelector('input[name="id"]').value = u.id;
    form.querySelector('input[name="name"]').value = u.name;
    form.querySelector('select[name="acType"]').value = u.acType || "portable";
-    form.querySelector('input[name="capacityBtu"]').value = u.capacityBtu || 0;
+    form.querySelector('input[name="capacityBtu"]').value = displayToUnit(u.capacityBtu || 0);
    form.querySelector('input[name="efficiencyEer"]').value = u.efficiencyEer || 10;
    form.querySelector('input[name="hasDehumidify"]').checked = !!u.hasDehumidify;
    form.querySelector('input[name="canHeat"]').checked = !!u.canHeat;
-    form.querySelector('input[name="heatingCapacityBtu"]').value = u.heatingCapacityBtu || 0;
+    form.querySelector('input[name="heatingCapacityBtu"]').value = displayToUnit(u.heatingCapacityBtu || 0);
+    // Extended fields
+    form.dataset.seer = u.seer || "";
+    form.dataset.seerClass = u.seerClass || "";
+    form.dataset.scop = u.scop || "";
+    form.dataset.scopClass = u.scopClass || "";
+    form.dataset.cop = u.cop || "";
+    form.dataset.tol = u.tol || "";
+    form.dataset.tbiv = u.tbiv || "";
+    form.dataset.refrigerant = u.refrigerant || "";
+    if (u.seer || u.scop || u.refrigerant) {
+      showExtendedInfo(u);
+    } else {
+      hideExtendedInfo();
+    }
    // Check assigned rooms
    const assignments = await dbGetAll("ac_assignments");
    const assignedRoomIds = new Set(assignments.filter(a => a.acId === id).map(a => a.roomId));
@@ -670,16 +914,28 @@
    const profileId = await getActiveProfileId();
    if (!profileId) { showToast("Select a profile first", true); return; }
    const data = formData(e.target);
+    const rawCap = numOrDefault(data.capacityBtu, 0);
+    const rawHeat = numOrDefault(data.heatingCapacityBtu, 0);
    const unit = {
      profileId,
      name: data.name,
      acType: data.acType || "portable",
-      capacityBtu: numOrDefault(data.capacityBtu, 0),
+      capacityBtu: inputToBtu(rawCap),
      efficiencyEer: numOrDefault(data.efficiencyEer, 10),
      hasDehumidify: !!data.hasDehumidify,
      canHeat: !!data.canHeat,
-      heatingCapacityBtu: numOrDefault(data.heatingCapacityBtu, 0),
+      heatingCapacityBtu: inputToBtu(rawHeat),
    };
+    // Extended fields from form dataset
+    const form = e.target;
+    if (form.dataset.seer) unit.seer = parseFloat(form.dataset.seer) || 0;
+    if (form.dataset.seerClass) unit.seerClass = form.dataset.seerClass;
+    if (form.dataset.scop) unit.scop = parseFloat(form.dataset.scop) || 0;
+    if (form.dataset.scopClass) unit.scopClass = form.dataset.scopClass;
+    if (form.dataset.cop) unit.cop = parseFloat(form.dataset.cop) || 0;
+    if (form.dataset.tol) unit.tol = parseFloat(form.dataset.tol) || 0;
+    if (form.dataset.tbiv) unit.tbiv = parseFloat(form.dataset.tbiv) || 0;
+    if (form.dataset.refrigerant) unit.refrigerant = form.dataset.refrigerant;
    let acId;
    if (data.id) {
      unit.id = parseInt(data.id);
@@ -698,6 +954,7 @@
      await dbPut("ac_assignments", { acId, roomId: parseInt(cb.value) });
    }
    resetForm(e.target);
+    clearACExtendedData();
    await loadACUnits();
    await updateTabBadges();
    showToast("AC unit saved", false);
@@ -892,6 +1149,7 @@

  // ========== Init ==========
  async function init() {
+    await loadCapacityUnit();
    await loadProfiles();
    await loadRooms();
    await loadDevices();
--- a/web/templates/layout.html
+++ b/web/templates/layout.html
@@ -40,6 +40,7 @@
    <div class="mx-auto px-4 sm:px-6 lg:px-8 text-center text-xs text-gray-400 dark:text-gray-500 space-y-1">
      <div>{{t "app.name"}} v1.0.0 — {{t "app.tagline"}}</div>
      <div><a href="https://somegit.dev/vikingowl/HeatGuard" class="hover:text-orange-600 dark:hover:text-orange-400" target="_blank" rel="noopener">{{t "footer.source"}}</a> · {{t "footer.license"}}</div>
+      <div>{{t "footer.betterventCredit"}} <a href="https://bettervent.me" class="hover:text-orange-600 dark:hover:text-orange-400" target="_blank" rel="noopener">bettervent.me</a></div>
    </div>
  </footer>

--- a/web/templates/setup.html
+++ b/web/templates/setup.html
@@ -265,6 +265,23 @@
  <section id="tab-ac" class="tab-panel hidden">
    <p class="text-sm text-gray-500 dark:text-gray-400 mb-4">{{t "setup.ac.help"}}</p>
    <div id="ac-no-rooms" class="hidden text-sm text-amber-600 dark:text-amber-400 mb-3">{{t "setup.ac.noRooms"}}</div>
+
+    <!-- Device search -->
+    <div class="mb-3">
+      <label class="block text-sm font-medium mb-1">{{t "setup.ac.search.label"}}</label>
+      <div class="relative">
+        <input type="text" id="ac-device-search" placeholder="{{t "setup.ac.search.placeholder"}}" class="w-full px-3 py-1.5 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700 text-sm">
+        <div id="ac-search-results" class="hidden absolute z-40 w-full mt-1 bg-white dark:bg-gray-800 border border-gray-300 dark:border-gray-600 rounded-lg shadow-lg max-h-64 overflow-y-auto"></div>
+      </div>
+      <p class="text-xs text-gray-400 dark:text-gray-500 mt-1">{{t "setup.ac.search.hint"}} — <a href="https://bettervent.me" class="text-orange-600 dark:text-orange-400 hover:underline" target="_blank" rel="noopener">bettervent.me</a></p>
+    </div>
+
+    <!-- Unit toggle -->
+    <div class="flex items-center gap-2 mb-3">
+      <span class="text-sm text-gray-500 dark:text-gray-400">{{t "setup.ac.unit.switch"}}:</span>
+      <button type="button" id="ac-unit-toggle" class="px-3 py-1 text-xs rounded-full border border-gray-300 dark:border-gray-600 hover:bg-gray-100 dark:hover:bg-gray-700 transition font-medium" data-unit="btuh">BTU/h</button>
+    </div>
+
    <form id="ac-form" class="bg-white dark:bg-gray-800 rounded-xl p-4 shadow-sm space-y-3 mb-4">
      <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-3">
        <div>
@@ -279,7 +296,7 @@
          </select>
        </div>
        <div>
-          <label class="block text-sm font-medium mb-1">{{t "setup.ac.capacity.label"}} <span class="tooltip-trigger" data-tooltip="{{t "setup.ac.capacity.tooltip"}}">?</span></label>
+          <label class="block text-sm font-medium mb-1" id="ac-capacity-label">{{t "setup.ac.capacity.label"}} <span class="tooltip-trigger" data-tooltip="{{t "setup.ac.capacity.tooltip"}}">?</span></label>
          <input type="number" name="capacityBtu" step="100" required class="w-full px-3 py-1.5 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700 text-sm">
        </div>
        <div>
@@ -299,7 +316,7 @@
          </label>
        </div>
        <div>
-          <label class="block text-sm font-medium mb-1">{{t "setup.ac.heatingCapacity.label"}} <span class="tooltip-trigger" data-tooltip="{{t "setup.ac.heatingCapacity.tooltip"}}">?</span></label>
+          <label class="block text-sm font-medium mb-1" id="ac-heating-capacity-label">{{t "setup.ac.heatingCapacity.label"}} <span class="tooltip-trigger" data-tooltip="{{t "setup.ac.heatingCapacity.tooltip"}}">?</span></label>
          <input type="number" name="heatingCapacityBtu" step="100" value="0" class="w-full px-3 py-1.5 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700 text-sm">
        </div>
      </div>
@@ -313,6 +330,20 @@
      </div>
      <input type="hidden" name="id" value="">
    </form>
+
+    <!-- Extended device info (shown after search selection or when editing device with extended data) -->
+    <div id="ac-extended-info" class="hidden bg-gray-50 dark:bg-gray-900 rounded-lg p-3 text-sm space-y-1 mb-4">
+      <div class="font-medium text-gray-600 dark:text-gray-300 mb-1" id="ac-extended-title"></div>
+      <div class="grid grid-cols-2 sm:grid-cols-3 gap-x-4 gap-y-0.5 text-xs text-gray-500 dark:text-gray-400">
+        <div>{{t "setup.ac.seer"}}: <span id="ac-ext-seer" class="font-medium text-gray-700 dark:text-gray-200"></span></div>
+        <div>{{t "setup.ac.scop"}}: <span id="ac-ext-scop" class="font-medium text-gray-700 dark:text-gray-200"></span></div>
+        <div>{{t "setup.ac.cop"}}: <span id="ac-ext-cop" class="font-medium text-gray-700 dark:text-gray-200"></span></div>
+        <div>{{t "setup.ac.tol"}}: <span id="ac-ext-tol" class="font-medium text-gray-700 dark:text-gray-200"></span></div>
+        <div>{{t "setup.ac.tbiv"}}: <span id="ac-ext-tbiv" class="font-medium text-gray-700 dark:text-gray-200"></span></div>
+        <div>{{t "setup.ac.refrigerant"}}: <span id="ac-ext-refrigerant" class="font-medium text-gray-700 dark:text-gray-200"></span></div>
+      </div>
+    </div>
+
    <div id="ac-list" class="space-y-2">
      <p class="text-sm text-gray-400 dark:text-gray-500">{{t "setup.ac.noItems"}}</p>
    </div>