Freeze Dryer Running Costs
The recurring costs are electricity for a 20 to 40 hour cycle, pump maintenance (oil and filtering on rotary vane pumps), and packaging, meaning Mylar bags and oxygen absorbers for every batch. Trays, silicone mats and dividers are consumables too. Electricity cost depends entirely on your tariff and the machine's wattage, so calculate it rather than trusting a headline figure.
The sticker price is the easy number. The one that decides whether a freeze dryer fits your life is what each batch costs you, and that has four parts.
1. Electricity, which you can calculate properly
Take the machine's stated wattage, which listings in this class commonly put in the 1,000 to 1,600W range for the combined compressor, pump and heaters, though not all of that draws continuously. Multiply kilowatts by the cycle hours to get kilowatt hours, then multiply by your tariff per kWh.
A worked example of the method, not a prediction: a 1.5kW machine averaging roughly half that draw across a 30 hour cycle is about 22kWh. At your own rate per kWh, that is your cost per batch. The important part is that cycles are long, so this is the recurring cost that dominates.
2. Pump maintenance
Most machines in this class use a rotary vane oil pump. Oil picks up moisture and contamination over cycles, so it needs filtering or replacing on a schedule set by the manufacturer. Budget for oil and for a filter if your pump uses one. Oil free pumps remove this cost but usually trade some ultimate vacuum, and they are less common at this price.
This is also the maintenance that gets skipped and then becomes a repair, because a pump running on degraded oil does not reach the pressure sublimation needs, which shows up as cycles that never finish properly.
3. Packaging, every single batch
This is the cost people forget, and it is not optional. Freeze dried food is porous and reabsorbs moisture from air quickly, so the shelf life only exists if the output goes into a sealed oxygen barrier. In practice that means a Mylar bag plus an oxygen absorber sized to the bag, for every batch, forever.
Absorber sizing is a real number rather than a guess, covered in how many oxygen absorbers do I need, and bag sizing in the Mylar bag size guide.
4. Trays, mats and dividers
Tray gear is genuinely consumable. Silicone mats and parchment make unloading possible without scraping, dividers let you run several foods in one cycle without them touching, and extra tray sets let you load the next batch while one is sealing. None of it is expensive individually, and all of it recurs.
Putting it together
| Cost | Frequency | How to size it |
|---|---|---|
| Electricity | Every cycle | Stated wattage times cycle hours times your tariff |
| Pump oil and filters | On a schedule | Check the manufacturer interval before buying |
| Mylar and absorbers | Every batch | Absorber cc sized to bag volume, roughly 300cc per gallon |
| Mats, parchment, dividers | Ongoing | Replace as they wear; buy in multipacks |
| Trap defrost time | Every cycle | Not money, but it is machine downtime between batches |
If these numbers are what will make or break the decision for you, read them alongside is a freeze dryer worth it.
Frequently asked questions
How much electricity does a freeze dryer use?
Calculate it rather than trusting a headline: stated kilowatts times cycle hours gives kWh, then apply your own tariff. Long cycles are what make this the dominant running cost.
How often does pump oil need changing?
It depends on the pump and how wet your loads are, so follow the manufacturer interval. Degraded oil stops the pump reaching working vacuum, which looks like a machine fault.
Do I really need Mylar and oxygen absorbers?
Yes, if you want the shelf life. Freeze dried food is porous and reabsorbs moisture from air quickly, so a sealed oxygen barrier is part of the process, not an upgrade.
Is an oil free pump cheaper to run?
It removes oil and filter costs, which is a real saving, but these pumps usually trade some ultimate vacuum and are less common in this price class.