From 36bcce563ab7f72d2b8864dd1c26bb807c701fbc Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Thu, 1 Oct 2026 13:35:15 -0500
Subject: [PATCH] [sensor] Fix a double promotion warning in the NTC resistance
 filter (#19985)

---
 esphome/components/sensor/filter.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/components/sensor/filter.cpp b/esphome/components/sensor/filter.cpp
index dbd6f4d34b..9b9d7c033a 100644
--- a/esphome/components/sensor/filter.cpp
+++ b/esphome/components/sensor/filter.cpp
@@ -450,7 +450,7 @@ optional<float> ToNTCResistanceFilter::new_value(float value) {
   }
   double k = 273.15;
   // https://de.wikipedia.org/wiki/Steinhart-Hart-Gleichung#cite_note-stein2_s4-3
-  double t = value + k;
+  double t = static_cast<double>(value) + k;
   double y = (this->a_ - 1 / (t)) / (2 * this->c_);
   double x = sqrt(pow(this->b_ / (3 * this->c_), 3) + y * y);
   double resistance = exp(pow(x - y, 1 / 3.0) - pow(x + y, 1 / 3.0));