Chest freezer
How much electricity does a chest freezer use?
100–300 W running · 0.5–1.5 kWh/day · $3–$7 per month
Every time an upright freezer door opens, the cold air spills out onto the floor and is replaced by warm room air the compressor must then cool. A chest freezer holds its cold air in, which is why the same volume typically uses 20–30% less energy.
Typical consumption
- 5 cu ft chest: 0.4–0.7 kWh/day
- 7–9 cu ft chest: 0.6–1.0 kWh/day
- 15 cu ft chest: 1.0–1.5 kWh/day
- Upright, same size: add 20–30%
The second freezer trap
An old chest freezer in the garage running mostly empty is one of the worst energy offenders in a house — often 1.5–2.5 kWh/day to keep a few items frozen. If it is less than half full, either fill it or unplug it. A full freezer is more efficient than an empty one because frozen mass holds the temperature.
Placement matters more than rating
A freezer in an unheated garage works harder in summer and can struggle in winter, and many "garage ready" models are simply rated for a wider ambient range. Placing it in a cool, dry, ventilated spot can save 10–15% with no other change.
Frequently asked questions
How many watts does a chest freezer use?
100–300 W running. The figure on the rating label is the maximum draw; actual use varies with settings, age and usage pattern.
How much does it cost to run a chest freezer per month?
With the defaults above it comes to the monthly figure shown in the calculator. At 16.5¢/kWh — the US residential average — that is a realistic middle estimate. Your own bill may be 30% lower or higher depending on state.
Is it cheaper to run a chest freezer at night?
Only if your utility offers a time-of-use plan and you avoid the 4pm–9pm peak window. On a flat-rate plan, the time of day makes no difference to the total.
Does the calculator account for real-world duty cycles?
Not automatically — you enter the effective hours yourself. For compressing appliances like refrigerators and AC units, enter the running watts and roughly the proportion of time the compressor is on, which is usually 30–50%.
Will a newer chest freezer actually save money?
Compare the kWh figure in the calculator against an Energy Star model's stated annual use. If the difference is a few hundred kWh a year, the payback on a replacement is usually long; if it is over 500 kWh, it is worth pricing out.