Abstract: A retrofitting kit or system that both improves the efficiency of a heat pump, and inhibits theft or damage to the heat pump, the kit comprising one or more ground anchors connected to or forming part of a support frame, a plurality of transpired solar collector panels for attachment to or forming part of the support frame for forming an envelopment around a heat pump, an exhaust shroud for isolating heat pump exhaust ejected from the heat pump, the exhaust shroud adapted to fit over the exhaust portion of a heat pump, fastening means for fastening the exhaust shroud to the heat pump, an exhaust conduit connected to or forming part of the exhaust shroud, the exhaust conduit extending from the exhaust shroud through the envelopment at an exhaust port for isolating and conveying to an area external of the envelopment, the exhaust gas ejected from the heat pump, and a dilution air damper formed into the envelopment for selectively allowing heat pump inlet air to pass directly into the envelopment via the air dam