"To warm the heart" means to bring happiness, comfort, and joy to someone's emotions. It refers to actions, words, or gestures that make someone feel happy and loved. Full definition
Every so often however, a personal post that doesn't have much to do with writing / your work can really warm the hearts of readers. (midnightpublishingllc.com)
I am an honest, open minded woman with warm heart. (loveawake.com)
You are just precious and you just warm my heart over and over. (sugarpiefarmhouse.com)