The article presents a novel approach to heat control using external pressure on 2-amino-2-methyl-1,3-propanediol (AMP) in its supercooled plastic crystal state. The supercooled plastic crystal state of AMP is highly sensitive to pressure, with even several megapascals inducing crystallization and a substantial temperature increase of 48 K within 20 seconds. The authors demonstrate a proof-of-concept device that can programmably heat with an ultrahigh work-to-heat conversion efficiency of approximately 383. This efficient and delicate heat tuning has significant potential for rational utilization of waste heat, addressing the challenge of controlling heat in thermal engineering. The study highlights the feasibility of using external pressure to manipulate heat, offering a promising method for thermal energy recycling and waste heat recovery.The article presents a novel approach to heat control using external pressure on 2-amino-2-methyl-1,3-propanediol (AMP) in its supercooled plastic crystal state. The supercooled plastic crystal state of AMP is highly sensitive to pressure, with even several megapascals inducing crystallization and a substantial temperature increase of 48 K within 20 seconds. The authors demonstrate a proof-of-concept device that can programmably heat with an ultrahigh work-to-heat conversion efficiency of approximately 383. This efficient and delicate heat tuning has significant potential for rational utilization of waste heat, addressing the challenge of controlling heat in thermal engineering. The study highlights the feasibility of using external pressure to manipulate heat, offering a promising method for thermal energy recycling and waste heat recovery.