Model
Sub-Zero CL3650F/S/*/*
Rank #620 means 619 of the 622 freezer models we track cost less to run each year; the 52nd efficiency percentile means it uses less energy for its size than 52% of those models.
What does the Sub-Zero CL3650F/S/*/* cost to run per year?
Out of the 622 freezer models we track, the Sub-Zero CL3650F/S/*/* lands at rank #620 on cost, roughly $119 a year, one of the most expensive figures in the class. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $130/yr to run, a saving of roughly $11 a year. Its size-adjusted efficiency percentile of 52 lands in the middle of the pack once capacity is accounted for. This class has no published efficiency-factor figure beyond annual kWh itself, so at 20.6 cu ft (the class spans 1.1 to 23), size is the clearest lever we can point to for this model's running cost.
Immediately around it on the leaderboard, the Viking Range,Llc FDFZIC7360R at $117/yr runs a little cheaper and the Monogram ZIF361NBR**** at $120/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A freezer typically stays in service for somewhere around 14 years; over that span, the Sub-Zero CL3650F/S/*/*'s $119/yr adds up to roughly $1666 in electricity alone, before purchase price or repairs. At rank #620 of 622, it sits at the very top of the cost range for its class, among the single priciest models we track to run.
By the numbers
The Sub-Zero CL3650F/S/*/* normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $119/yr, here is what the Sub-Zero CL3650F/S/*/* adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Sub-Zero CL3650F/S/*/* costs about $1190. That is roughly $110 less than a standard model in its class, which would run closer to $1300 over the same ten years.
How the Sub-Zero CL3650F/S/*/* compares
The freezer class we track runs from $25 to $120 a year. At $119/yr, it runs about $44 a year above the class median of $75, and it is about $94 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $130/yr, the Sub-Zero CL3650F/S/*/* uses 10% less energy.
What drives its running cost
At 20.6 cu ft, the Sub-Zero CL3650F/S/*/* is a large freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, among freezer models, bigger capacity is the most common reason a running-cost figure lands on the high side, all else being equal.
- Interior volume. As with refrigerators, more cubic feet of frozen storage generally means a bigger compressor and a higher annual energy figure.
- Insulation and defrost type. Better-insulated cabinets lose less cold to the surrounding room, and frost-free (automatic-defrost) freezers run a periodic heating element that a manual-defrost model does not.
- Chest vs upright design. Door orientation affects how much cold air escapes per opening: top-opening chest designs generally hold cold better than front-opening upright ones.
Common questions
Is the Sub-Zero CL3650F/S/*/* cheap to run?
Its $119/yr running cost, rank #620 of 622, is above what most freezer models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Sub-Zero CL3650F/S/*/* cost per month?
About $9.9 a month, which is the $119 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 640 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $119 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Sub-Zero CL3650F/S/*/* for its size?
52nd percentile once size is factored in. That means its size-adjusted efficiency is a real factor in the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
Source
ES_0031863_CL3650F/S/*/*_11162022125230_80147915View certified freezer listingsENERGY STAR data as of July 2026Sub-Zero and CL3650F/S/*/* are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.