That's my objective in this situation. For the new hack, I'm rigging up a small outdoor air source unit to a water cylinder, much like the diy water heater heat pump. The water cylinder will act as a buffer or heat store for space heating via passive or forced air radiators. Rather than having a bang-bang thermostat directly sensing the indoor air, the odr demands heat pump operation based on the tank and outdoor temperature. When the zone is warm enough or not in use, the flow can be cut off. Meanwhile, the tank will radiate some heat on its own to offset the natural loss.
The main goal is to have long outdoor unit cycling and more even heating of the zone.
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