diff --git a/control_plane/attachment_service/src/reconciler.rs b/control_plane/attachment_service/src/reconciler.rs
index 603da9bf02..2d563a4f35 100644
--- a/control_plane/attachment_service/src/reconciler.rs
+++ b/control_plane/attachment_service/src/reconciler.rs
@@ -18,6 +18,8 @@ use crate::compute_hook::{ComputeHook, NotifyError};
 use crate::node::Node;
 use crate::tenant_state::{IntentState, ObservedState, ObservedStateLocation};
 
+const DEFAULT_HEATMAP_PERIOD: &str = "60s";
+
 /// Object with the lifetime of the background reconcile task that is created
 /// for tenants which have a difference between their intent and observed states.
 pub(super) struct Reconciler {
@@ -525,7 +527,12 @@ impl Reconciler {
                 )));
             };
 
-            let mut wanted_conf = attached_location_conf(generation, &self.shard, &self.config);
+            let mut wanted_conf = attached_location_conf(
+                generation,
+                &self.shard,
+                &self.config,
+                !self.intent.secondary.is_empty(),
+            );
             match self.observed.locations.get(&node.get_id()) {
                 Some(conf) if conf.conf.as_ref() == Some(&wanted_conf) => {
                     // Nothing to do
@@ -662,10 +669,26 @@ impl Reconciler {
     }
 }
 
+/// We tweak the externally-set TenantConfig while configuring
+/// locations, using our awareness of whether secondary locations
+/// are in use to automatically enable/disable heatmap uploads.
+fn ha_aware_config(config: &TenantConfig, has_secondaries: bool) -> TenantConfig {
+    let mut config = config.clone();
+    if has_secondaries {
+        if config.heatmap_period.is_none() {
+            config.heatmap_period = Some(DEFAULT_HEATMAP_PERIOD.to_string());
+        }
+    } else {
+        config.heatmap_period = None;
+    }
+    config
+}
+
 pub(crate) fn attached_location_conf(
     generation: Generation,
     shard: &ShardIdentity,
     config: &TenantConfig,
+    has_secondaries: bool,
 ) -> LocationConfig {
     LocationConfig {
         mode: LocationConfigMode::AttachedSingle,
@@ -674,7 +697,7 @@ pub(crate) fn attached_location_conf(
         shard_number: shard.number.0,
         shard_count: shard.count.literal(),
         shard_stripe_size: shard.stripe_size.0,
-        tenant_conf: config.clone(),
+        tenant_conf: ha_aware_config(config, has_secondaries),
     }
 }
 
@@ -689,6 +712,6 @@ pub(crate) fn secondary_location_conf(
         shard_number: shard.number.0,
         shard_count: shard.count.literal(),
         shard_stripe_size: shard.stripe_size.0,
-        tenant_conf: config.clone(),
+        tenant_conf: ha_aware_config(config, true),
     }
 }
diff --git a/control_plane/attachment_service/src/service.rs b/control_plane/attachment_service/src/service.rs
index 556d6a6828..024e4058aa 100644
--- a/control_plane/attachment_service/src/service.rs
+++ b/control_plane/attachment_service/src/service.rs
@@ -899,6 +899,7 @@ impl Service {
                             tenant_state.generation.unwrap(),
                             &tenant_state.shard,
                             &tenant_state.config,
+                            false,
                         )),
                     },
                 )]);
@@ -2424,7 +2425,12 @@ impl Service {
                     child_observed.insert(
                         pageserver,
                         ObservedStateLocation {
-                            conf: Some(attached_location_conf(generation, &child_shard, &config)),
+                            conf: Some(attached_location_conf(
+                                generation,
+                                &child_shard,
+                                &config,
+                                matches!(policy, PlacementPolicy::Double(n) if n > 0),
+                            )),
                         },
                     );
 
diff --git a/control_plane/attachment_service/src/tenant_state.rs b/control_plane/attachment_service/src/tenant_state.rs
index c775736b31..202248a6d1 100644
--- a/control_plane/attachment_service/src/tenant_state.rs
+++ b/control_plane/attachment_service/src/tenant_state.rs
@@ -577,7 +577,12 @@ impl TenantState {
                 .generation
                 .expect("Attempted to enter attached state without a generation");
 
-            let wanted_conf = attached_location_conf(generation, &self.shard, &self.config);
+            let wanted_conf = attached_location_conf(
+                generation,
+                &self.shard,
+                &self.config,
+                !self.intent.secondary.is_empty(),
+            );
             match self.observed.locations.get(&node_id) {
                 Some(conf) if conf.conf.as_ref() == Some(&wanted_conf) => {}
                 Some(_) | None => {