We address the energy transfer in the differential system $$ begin{cases} u_{ttt}+alpha u_{tt} - beta Delta u_t - gamma Delta u = -eta Delta theta theta_t - kappa Delta theta =eta Delta u_{tt}+ alphaeta Delta u_t end{cases} $$ made by a Moore-Gibson-Thompson equation in the supercritical regime, hence antidissipative, coupled with the classical heat equation. The asymptotic properties of the related solution semigroup depend on the strength of the coupling, ruling the competition between the Fourier damping and the MGT antidamping. Exponential stability will be shown always to occur, provided that the coupling constant is sufficiently large with respect to the other structural parameters. A fact of general interest will be also discussed, namely, the impossibility of attaining the optimal exponential decay rate of a given dissipative system via energy estimates.
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