Heat Pump (COP)

Heat pump (COP) refers to a device that moves heat from one place to another rather than creating it, and to the figure of merit that measures how well it does so. The Coefficient of Performance (COP) is the ratio of useful heat delivered to electrical energy consumed. Because a heat pump relocates existing heat — pulling it from outdoor air, the ground, or water — instead of converting electricity into heat, its COP is almost always greater than 1. Typical modern units achieve a COP of roughly 2.5 to 4 in real-world conditions, meaning every kilowatt-hour of electricity delivers two-and-a-half to four kilowatt-hours of heat. A resistive electric heater, by contrast, is capped at a COP of exactly 1: one kilowatt-hour in, one kilowatt-hour of heat out, no more.

Where the extra heat comes from

A heat pump runs a refrigeration cycle in reverse: a refrigerant absorbs low-grade heat outside, is compressed to raise its temperature, and releases that heat indoors. The electricity pays only for the compressor and fans, not for the heat itself, which is why the output can exceed the input several times over without violating any law of physics. The catch is that COP falls as the temperature difference grows — an air-source unit that manages COP 4 in mild weather may drop toward 2 in a deep Canadian cold snap, exactly when you need heat most. Ground-source systems hold their COP better because the earth stays at a stable temperature year-round.

Why this matters for miners

An ASIC miner is, thermodynamically, a resistive heater: essentially all the electricity it draws ends up as heat in the room, while producing hashrate as a byproduct. At COP 1 it can never match a heat pump on heat-per-kilowatt-hour. What changes the equation is that the miner's kilowatt-hours also earn sats. A miner warming a home office, garage, greenhouse, or workshop displaces heating that something else would have provided, so its electricity is paid for twice: once in bitcoin revenue and once in avoided heating cost. This is the foundation of D-Central's space-heater positioning — quiet, tuned machines that heat a room like any 1,000–1,500 W electric heater would, while working for you. See waste heat recovery for the same logic applied at larger scale.

Running the COP comparison honestly

COP is the benchmark that decides whether heating with a miner beats heating with a heat pump. Against baseboards, plug-in heaters, or any other resistive heat, the miner wins outright — identical heat output, plus revenue. Against a heat pump at COP 3–4, the heat pump delivers three to four times the heat per kilowatt-hour, so the miner must close that gap with mining revenue. Whether it does depends on your electricity rate, the current hashprice, and the machine's efficiency — which is why the break-even electricity price calculation should include displaced heating cost as a credit. In practice, homes already heated resistively are the slam-dunk case; homes with an efficient heat pump justify a miner on revenue and resilience grounds rather than pure heating economics.

The hybrid answer

The two technologies are not rivals in most real homes — they layer. A heat pump carries the base heating load at high COP; miners heat the specific rooms where their warmth and revenue are welcome, and their output can be dialed with underclocking to match the space. The sovereign-household version of heating strategy is not "miner versus heat pump" but "every kilowatt-hour should do at least one useful job — and some can do two."