A large 21 cubic foot convertible upright that switches between freezer and refrigerator duty, making it the most flexible high-capacity unit in this lineup.
Households that want one big appliance they can run as a freezer now and a refrigerator later, or that need substantial frozen storage with auto-defrost convenience.
Skip if
You have a small kitchen or tight budget; this is a heavy, 21 cubic foot, $1,339 appliance that needs real floor space and a sturdy install spot.
Capacity 21.0 cu ft
Configuration Freestanding
Installation Freestanding
Doors 1
Defrost Automatic
Cooling Compressor
Priced 50% above the category median ($891.74 across 34 tracked models)
Capacity of 21.0 cu ft - larger than 93% of the 34 models we track
Weight of 225.0 lb - heavier than 85% of the 34 models we track
Pros
Large 21 cubic foot capacity, the biggest in this lineup
Converts between freezer and refrigerator use
Automatic defrost avoids manual frost removal
Four shelves plus clear drawers organize a French-door layout
Highest star rating here at 4.6, with adjustable temperature control
Cons
Premium $1,339 price
Heavy at 225 pounds and needs dedicated floor space
Review count (43) is still modest compared with the compacts
Our scorecard
4.3/5overall
Owner rating4.6/5
4.6 average across 43 owner ratings
Value for money3.9/5
$64 per cubic foot, below the category median
Popularity3.2/5
43 owner reviews, more than most models here
Storage space4.8/5
21.0 cu ft, roomy for this category
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other refrigerators and freezers we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The KoolMore KM-RUF-21S is the heavyweight of this group. At 21 cubic feet it offers far more storage than any of the compact units here, and its standout trick is convertibility: it runs as a freezer or a refrigerator, so the same cabinet can adapt as your needs change.
The build reflects that ambition. It uses a compressor cooling system with automatic defrost, so you avoid the manual frost scraping that smaller freezers demand, and the interior is organized with four shelves plus clear drawers in a French-door style layout. Temperature control lets you dial in the setting for whichever mode you are running.
At $1,339 and 225 pounds it is a genuine investment and a permanent fixture rather than a portable extra. Its early 4.6-star average across 43 ratings is the highest in this roundup, though on a smaller sample than the long-established compacts. For a buyer who wants one large, flexible, low-maintenance cold box, it makes a strong case.
Specifications
Capacity
21.0 cu ft
Configuration
Freestanding
Installation
Freestanding
Doors
1
Defrost
Automatic
Cooling
Compressor
Shelves
4
Temp control
Yes
Door
Right
Color
Silver
Weight
225.0 lb
Voltage
120 Volts
Performance notes
This is a full-size appliance: 21 cubic feet on a compressor with automatic defrost means it can hold a household's frozen stock and run hands-off, with no manual defrosting. Four shelves and clear drawers in a French-door arrangement keep contents visible and sorted, and temperature control supports its convertible role between freezer and fridge. It is freestanding on a standard 120-volt outlet, but at 225 pounds it should be positioned once and left in place.
What buyers say
Early buyers respond well to the capacity and the flexibility of running it as either a freezer or a refrigerator, and the auto-defrost and clear drawers draw praise for everyday convenience. The 4.6-star average is the strongest here, though shoppers should note it rests on a smaller body of reviews than the long-selling compact models. The price and weight are the practical considerations most buyers weigh up front.
Can the KoolMore KM-RUF-21S be used as a refrigerator?
Yes. It is a convertible 2-in-1 appliance, so you can run it as an upright freezer or switch it to operate as a refrigerator using the temperature control.
Does it need manual defrosting?
No. It uses automatic defrost with a compressor cooling system, so you avoid the manual frost removal that smaller freezers often require.
How big is it?
It offers 21 cubic feet of storage with four shelves and clear drawers, and it weighs about 225 pounds, so plan for a permanent freestanding spot.
