diff --git a/cal_and_val/thermal/f3-vehicles/2021_Hyundai_Sonata_Hybrid_Blue.yaml b/cal_and_val/thermal/f3-vehicles/2021_Hyundai_Sonata_Hybrid_Blue.yaml
index 3f8ec9cc..36ad0c46 100644
--- a/cal_and_val/thermal/f3-vehicles/2021_Hyundai_Sonata_Hybrid_Blue.yaml
+++ b/cal_and_val/thermal/f3-vehicles/2021_Hyundai_Sonata_Hybrid_Blue.yaml
@@ -235,7 +235,7 @@ cabin:
 hvac:
   LumpedCabin:
     te_set_kelvin: 295.15
-    te_deadband_kelvin: 1.5
+    te_deadband_kelvin: 0.5
     p_watts_per_kelvin: 100.0
     i: 50.0
     # TODO: bump this up
diff --git a/fastsim-core/src/vehicle/hvac/hvac_sys_for_lumped_cabin.rs b/fastsim-core/src/vehicle/hvac/hvac_sys_for_lumped_cabin.rs
index 444f52c3..366bbd31 100644
--- a/fastsim-core/src/vehicle/hvac/hvac_sys_for_lumped_cabin.rs
+++ b/fastsim-core/src/vehicle/hvac/hvac_sys_for_lumped_cabin.rs
@@ -47,7 +47,7 @@ impl Default for HVACSystemForLumpedCabin {
     fn default() -> Self {
         Self {
             te_set: Some(*TE_STD_AIR),
-            te_deadband: 1.5 * uc::KELVIN_INT,
+            te_deadband: 0.5 * uc::KELVIN_INT,
             p: Default::default(),
             i: Default::default(),
             d: Default::default(),