diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 97ee1f7..df08a5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,6 +10,27 @@ env:
   UV_PYTHON: "3.11"
 
 jobs:
+  wheel:
+    name: Unit tests (installed wheel)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v4
+        with:
+          version: "latest"
+      - run: uv python install 3.11
+      - name: Build and install the candidate wheel
+        run: |
+          uv build --wheel --out-dir "$RUNNER_TEMP/wheel-dist"
+          sha256sum "$RUNNER_TEMP"/wheel-dist/*.whl
+          uv venv --python 3.11 "$RUNNER_TEMP/wheel-env"
+          wheel=("$RUNNER_TEMP"/wheel-dist/*.whl)
+          test "${#wheel[@]}" -eq 1
+          uv pip install --python "$RUNNER_TEMP/wheel-env/bin/python" "${wheel[0]}[dev,all]"
+      - name: Run the unit suite against the installed wheel
+        run: |
+          "$RUNNER_TEMP/wheel-env/bin/python" -I scripts/check_wheel.py
+
   lint:
     name: Lint
     runs-on: ubuntu-latest
diff --git a/scripts/check_wheel.py b/scripts/check_wheel.py
new file mode 100644
index 0000000..e28ca38
--- /dev/null
+++ b/scripts/check_wheel.py
@@ -0,0 +1,31 @@
+"""Run the unit suite against the wheel installed in this environment, not the checkout."""
+
+import sys
+from importlib.metadata import version
+from pathlib import Path
+
+import pytest
+
+import arc_client
+
+repo = Path(__file__).resolve().parents[1]
+package = Path(arc_client.__file__).resolve().parent
+assert repo not in package.parents, f"Imported checkout instead of wheel: {package}"
+assert Path(sys.prefix).resolve() in package.parents, f"Package outside environment: {package}"
+print(f"arc-tsdb-client {version('arc-tsdb-client')}: {package}", flush=True)
+
+
+def check_imports():
+    for name, module in tuple(sys.modules.items()):
+        if name == "arc_client" or name.startswith("arc_client."):
+            origin = Path(module.__file__).resolve()
+            assert package in origin.parents, f"Source import during wheel tests: {name}: {origin}"
+
+
+check_imports()
+# The whole unit suite, so a module or data file the wheel leaves out fails
+# here whichever feature it belongs to. Install with [dev,all]: without pandas
+# and polars their tests skip instead of running.
+result = pytest.main(["--import-mode=importlib", "-o", "addopts=", "-q", str(repo / "tests/unit")])
+check_imports()
+sys.exit(result)