How much electricity does a freeze dryer use?
Updated 2026-09-20
A home freeze dryer draws somewhere between a large refrigerator and a small space heater while it runs, and a cycle lasts roughly a day to a day and a half. Multiply the maker's published power draw by the cycle hours and you get the kilowatt-hours per batch; at the 2025 US average of about 17 cents per kilowatt-hour, a typical medium unit lands in the range of a few dollars per batch. The number swings most with how wet the food is and how full the trays are — a half-empty run costs nearly as much as a full one.
The arithmetic
Power draw in watts, multiplied by hours, divided by a thousand, is kilowatt-hours. A unit that publishes a 1,100 W draw and a 24-hour cycle uses about 26 kWh per batch; at 17 cents that is around $4.50. Every unit on this site with both a published draw and a published cycle range shows this estimate, labelled as an estimate, with the rate it assumes. Check your own utility's rate — it ranges from under 10 cents to over 30 across the US.
Peak versus typical
Makers publish different things. Some quote the peak draw — what the machine pulls when the shelves are heating and the compressor and pump are all running — and some quote a typical or average figure. A peak figure overstates the energy per batch, because the machine spends much of a cycle below it. Where a maker's figure is a peak, the unit's page says so and the estimate is an upper bound.
What moves the number
Water. Freeze drying removes water, and the energy goes into turning ice to vapour and then freezing that vapour back onto the condenser. A tray of watery fruit takes longer and costs more than a tray of cooked meat. Ambient temperature matters too: a garage in August makes the compressor work harder. And load matters — the machine runs its fixed overhead whether the trays are full or half-full, so cost per pound is lowest when you run it full.
The circuit is a separate question
Energy is what you pay for; circuit is what you need on the wall. Small and medium home units run on a standard 110–120 V outlet, though some makers ask for a dedicated 20 A circuit so nothing else trips it. Large and extra-large units generally need 220–240 V. The catalog lists the maker's published voltage and amps for every unit, and the 220 V guide collects the ones that need the bigger circuit.