Thermodynamic heat recovery without an additional thermodynamic circuit

A computer-program product comprising a non-transitory computer-usable medium having computer-readable program code embodied therein, the computer-readable program code adapted to be executed to implement a method, the method comprising:

• operating a refrigerant circuit in a cooling mode or a heating mode to condition an indoor air in a conditioned space, the refrigerant circuit comprising a compressor operable to compress a refrigerant, an expansion valve, an outdoor heat exchanger, an indoor heat exchanger in a fresh air inlet to the conditioned space, first dampers operable to control a flow of fresh air through the fresh air inlet into a fresh air region, a recovery heat exchanger in an extracted air outlet from the conditioned space, second dampers operable to control a flow of exhausted air from an indoor air region through the extracted air outlet, and cross-dampers operable to allow recirculation from the indoor air region to the fresh air region;
• and
• recovering energy from the indoor air via the recovery heat exchanger,
• wherein the first dampers and the second dampers are open while the cross-dampers are closed in the heating mode and the cooling mode.