Is it efficient to heat a house with CPU crypto miners?

Yes, CPU crypto miners can heat your house, but they are usually no more energy-efficient than ordinary electric resistance heaters. Mining income may offset some heating costs, but a heat pump usually gives you more heat per unit of electricity. Miners make the most sense as supplemental heat in rooms you already need to warm.

Where the electricity goes

A running computer turns nearly all the electricity it uses into heat. That includes its processor, fans, memory, and power supply. If the computer is inside your heated space, that heat mostly stays in your house.

A miner drawing 300 watts from the wall gives you roughly 300 watts of heat. An electric resistance heater, which warms a heating element with electricity, does essentially the same thing.

So mining does not create “extra” heat for free. It adds a possible income stream to electricity you are already turning into warmth.

A heat pump works differently: it moves heat indoors rather than simply making it. Depending on the weather and equipment, it may deliver two to four units of heat for each unit of electricity, sometimes more. Mining revenue must overcome that efficiency gap before miners become cheaper to run for heating.

Work out the cost of useful heat

Start with electricity measured at the wall, not the processor’s advertised power rating. A plug-in energy meter captures the whole computer’s use.

For example, a computer drawing 300 watts continuously uses:

• 7.2 kilowatt-hours per day. A kilowatt-hour, or kWh, is the energy used by a 1,000-watt device running for one hour.
• At an example electricity price of $0.20 per kWh, that costs $1.44 per day before mining income.

Your practical calculation is:

Net heating cost = electricity cost + equipment costs − mining income after fees.

Count only heat you actually need. If mining warms an unused room or makes you open a window, that energy is not useful heating. In summer, air conditioning may add another cost to remove it.

Check a live mining calculator for estimated revenue. Monero’s price and mining competition change, so a profitable winter setup can become uneconomic later.

Why CPU choice and mining software matter

Monero uses RandomX, a mining calculation designed to favor CPUs, the main processors in computers. Still, not every CPU earns the same amount for the electricity it consumes.

For heating, distinguish two measures:

• Heat per watt: Nearly the same across computers and resistance heaters.
• Mining work per watt: Potentially very different between processors and settings.

Efficient hardware may earn more while producing the same amount of heat. Browser mining generally performs worse than well-configured native mining software, which runs directly on your computer. Do not assume a browser miner will meaningfully cover your heating bill.

Buying expensive computers solely for heat also adds a purchase cost that a basic heater avoids.

Practical limits in a house

One 300-watt computer is a small supplemental heater, not a whole-house heating system. Several machines add fan noise, dust, maintenance, and concentrated electrical demand.

Keep vents clear, use safe electrical circuits, and avoid overloaded extension leads. Unlike a purpose-built space heater, a computer is not designed around room-temperature control and heating safety features. Keep dependable conventional heating available.

The bottom line

CPU miners can make useful winter heat, especially from equipment you already own. Treat mining income as an uncertain discount on resistance heating—not proof that miners beat a heat pump or provide free warmth.