Who this guide is for
Who this guide is for
Homeowners, installers, and trade professionals replacing a failing residential or commercial through-the-wall wine cellar cooling unit (KoolR Magnum, older WhisperKOOL, or comparable self-contained units) in a non-loadbearing interior wall, with existing dedicated 115V power and a working drain path.
Who this guide is not for
Ducted split systems being converted to through-the-wall (or vice versa), exterior wall installations, loadbearing wall openings, cellars larger than 900 ft³, or applications requiring sub-10°C / 50°F storage.
Why the opening usually does not need to change
Through-the-wall wine cellar cooling has converged on a small range of cutout dimensions over the past two decades. Most self-contained units sold for residential cellars fit a wall opening close to 15 5/8 in (397 mm) wide by 9 1/4 in (235 mm) tall, in a wall between 5.5 in (140 mm) and 14 in (355 mm) thick. That convergence is why a like-for-like replacement is often possible without cutting drywall, reframing, or moving the electrical and drain.
The Wine-R WR2500 uses the same 15 5/8 in by 9 1/4 in cutout as the KoolR Magnum and most older self-contained through-the-wall units in that size class. When the existing opening, wall thickness, electrical, drainage, and clearances still meet spec, the new unit goes into the same hole. When one of those conditions has drifted, it is worth knowing before the old unit comes out, not after.
Three measurements decide whether the existing opening can be reused
Cutout width and height
Measure the rough opening at the framing, not the trim or the unit flange. Record the width and the height to the nearest 1/8 in. The WR2500 fits a 15 5/8 in by 9 1/4 in cutout. Differences inside that tolerance are a direct drop-in. Larger openings need a trim panel. Smaller openings have to be enlarged.
Wall thickness
Measure from the finished cellar-side surface to the finished warm-side surface, through the existing opening if possible. The WR2500 covers 5.5 in to 14 in of wall thickness. Thinner walls need blocking on one face. Thicker walls need a framed extension so the unit face stays flush.
Outlet and drain location
Confirm the dedicated 115V / 60Hz / 15A outlet is still in place near the warm side of the unit, and that a working drain run is reachable with a continuous downward slope. If the original install used an extension cord, a shared circuit, or a drain that rises or loops, the replacement is the moment to bring those to spec.
Common through-the-wall opening sizes and WR2500 fit
Cutout dimensions vary by manufacturer and by model year. The table below covers the most common formats in US residential cellars and how each maps to a WR2500 drop-in.
| Existing unit family | Typical cutout (W x H) | WR2500 drop-in fit |
|---|---|---|
| KoolR Magnum | 15 5/8 in x 9 1/4 in | Direct drop-in. Same cutout, same format. |
| Older self-contained through-the-wall units, 15-16 in wide | 15 5/8 in x 9 1/4 in nominal | Fits when the existing opening matches WR2500 cutout within 1/8 in. |
| Through-the-wall units with a wider or taller opening | Larger than 15 5/8 in x 9 1/4 in | Reuse possible with a trim panel sized to the unit face. |
| Through-the-wall units with a smaller opening | Smaller than 15 5/8 in x 9 1/4 in | The opening must be enlarged before installation. |
| Ducted split or self-contained ducted systems | Not a wall cutout | A through-the-wall replacement is not a like-for-like swap. |
KoolR Magnum units have been a popular through-the-wall option in US residential cellars. With limited US availability for replacement units, owners replacing a failing unit often look for a drop-in option that fits the existing opening without cutting drywall or reframing. The WR2500 was designed to match that cutout and that format.
What to verify before ordering the replacement
Cutout width and height
Measure the existing opening at the framing, not the trim. The WR2500 cutout is 15 5/8 in wide by 9 1/4 in tall. Differences over 1/8 in usually need a trim panel or framing change.
Wall thickness
The WR2500 fits walls between 5.5 in and 14 in. Thinner walls need blocking. Thicker walls need a framed extension to keep the unit face flush.
Wall type
The unit is for interior, non-loadbearing walls only. If the existing unit sits in an exterior wall or a loadbearing wall, that condition does not change with a new unit.
Cellar size and load
The WR2500 has a nominal cooling capacity of 2,337 BTU/h and is designed for cellars up to 700 ft³ with glass walls, or up to 900 ft³ fully enclosed, with R-20 insulation and double-pane sealed glass. If the cellar was at the edge of the previous unit’s capacity, or if the cellar volume has grown through renovation, run the BTU calculator before ordering.
Electrical
A dedicated 115V / 60Hz / 15A circuit, no extension cord, no switch-controlled circuit, no shared load.
Drainage
The WR2500 uses a 3/8 in (9.5 mm) ID drain hose with a continuous downward slope, under 5 feet (1.5 m) to a waste line, condensate pan, or floor drain. Runs that rise, loop, or exceed 5 feet require a condensate pump and a qualified installer. Older through-the-wall units sometimes used 1/4 in (6.3 mm) drainage, so the existing line may need a fitting adapter or replacement.
Clearances
12 in unobstructed in front of the cellar-side grille. 18 in unobstructed in front of the warm-side exhaust. Surrounding millwork should be checked before the new unit is ordered.
Warm-side room
The room receiving rejected heat should stay within normal residential conditions and have airflow. Sealed mechanical closets are a common cause of repeat failures.
Cellar envelope
R-20 minimum insulation, continuous sealed vapor barrier, tight door, and double-pane sealed (Low-E) glass. Single-pane and non-insulated glass are not permitted and will void warranty coverage. Large glazed areas increase the heat load significantly even with double-pane glass and may exceed the WR2500 capacity. A new unit cannot offset an envelope that drifted out of spec since the original install. Check insulation, vapor barrier, glass, and door seal at the same time as the unit replacement.
Service access
The owner is responsible for ensuring the unit remains accessible for warranty service, including removal from the wall when required. Plan the installation so the unit is not buried behind permanent millwork or sealed trim that cannot be opened for service.
When the opening can stay as it is
The existing cutout measures within 1/8 in of 15 5/8 in by 9 1/4 in, the wall is between 5.5 in and 14 in thick, and the wall is non-loadbearing and interior. The dedicated 115V / 60Hz / 15A outlet is still in place, the drain still runs with a continuous downward slope under 5 feet, and the clearances on both sides remain clear of millwork.
In that case, the replacement is a unit swap. Remove the old unit, inspect the perimeter for sealant condition, check the drain path, mount the WR2500, reseal the perimeter, and confirm operation. The cellar envelope should be checked at the same time, because a unit that failed early is often a symptom of envelope drift, not unit quality.
Disposing of the old unit: older through-the-wall cooling units contain refrigerant that must be recovered and disposed of according to EPA regulations. Engage a qualified HVAC technician or refrigeration appliance recycler to handle the old unit before installing the replacement. Many municipalities offer refrigerant appliance recycling at no cost to the homeowner.
When the opening has to be modified
The cutout is smaller than 15 5/8 in by 9 1/4 in, the wall thickness falls outside the 5.5 in to 14 in range, the wall is loadbearing or exterior, the dedicated electrical is not in place, or the drain run cannot meet the slope requirement without a pump. In any of those cases, the wall, framing, electrical, or plumbing has to change before the unit goes in.
Modifying an opening is straightforward when the wall is interior and non-loadbearing. It is a different scope when the wall is loadbearing or exterior, when structural framing is involved, or when a permit is required. In those cases, a licensed contractor and the appropriate trades should review the project before any cutting.
Send three measurements and three photos for a fit review
Before ordering, Wine-R confirms fit against the actual opening on every replacement. Send the cutout width, the cutout height, and the wall thickness, along with three photos: the cellar-side face of the existing unit, the warm-side vent, and the electrical outlet. The review covers fitment and surfaces any envelope or installation concerns worth addressing before the new unit ships.
Pre-validation confirms unit fit only and is not a substitute for an installer assessment of site readiness, electrical condition, drainage configuration, or structural conditions.
Replacement FAQ
Can I replace a failing wine cellar cooling unit without cutting a new opening?
Yes, if the existing opening matches the replacement unit format. For the Wine-R WR2500, the cutout is 15 5/8 in wide by 9 1/4 in tall, and the wall must be between 5.5 in and 14 in thick. Existing openings within 1/8 in of those dimensions are usually a direct drop-in. Wider or taller openings can be reused with a trim panel sized to the unit face. Smaller openings have to be enlarged before installation.
Is the WR2500 a drop-in replacement for a KoolR Magnum?
Yes. The WR2500 uses the same 15 5/8 in by 9 1/4 in cutout and the same through-the-wall format as the KoolR Magnum. Owners replacing a KoolR Magnum can reuse the existing wall opening when the wall thickness is between 5.5 in and 14 in and the clearances, electrical, and drainage are still in place. KoolR Magnum units are increasingly difficult to source in the US, so owners with a failing unit typically need a drop-in option that fits the existing opening.
What measurements do I need before I order a replacement unit?
Three measurements decide whether a replacement unit drops into the existing opening: width and height of the cutout at the framing, and wall thickness from the cellar-side surface to the warm-side surface. Photos of the cellar-side face, the warm-side vent, and the electrical outlet help confirm clearances and condition. Wine-R reviews these details against the declared opening before shipping a unit.
When does the wall opening have to be modified?
The opening has to be enlarged when the existing cutout is smaller than 15 5/8 in by 9 1/4 in. The wall has to be reframed when it is loadbearing, when it is an exterior wall, when the wall thickness is outside the 5.5 in to 14 in range, or when the new unit needs to move to a location with proper clearances. A loadbearing or exterior wall is not a like-for-like swap and should be reviewed by a licensed contractor before any cutting.
What is the difference between replacing a unit and replacing a system?
Replacing a unit means installing a new cooling unit in the same opening, with the same format, and the same room conditions. Replacing a system means changing the cooling type, for example moving from through-the-wall to ducted split, or from self-contained ducted to through-the-wall. A system change involves new routing, electrical, drainage, and often new openings. A unit replacement is faster, less expensive, and less disruptive when the existing opening can be reused.
How long does a through-the-wall replacement usually take?
When the existing opening is a direct drop-in, the physical swap is typically a one-day job for a careful homeowner or installer. Removing the old unit, inspecting drain and electrical, mounting the new unit, and sealing the perimeter is the core work. Most of the time on a wine cellar cooling replacement is spent verifying the room and the supporting trades, not the unit itself.
Will a new cooling unit fix a cellar that never held temperature?
Not on its own. A new unit replaces the equipment, not the room. If the original cellar drifted because of insulation gaps, a missing or torn vapor barrier, single-pane glass, an unsealed door, or a warm-side room with no airflow, the same conditions will challenge a new unit. The honest answer is to check the envelope at the same time as the unit, especially if the original was installed years ago. The DIY install guide covers the envelope checks that matter most.
Can I keep the old drain and outlet?
Usually yes, when both still meet the spec. The drain should run with a continuous downward slope, under 5 feet, with no kinks or freezing risk. The outlet should be a dedicated 115V / 60Hz / 15A circuit. Reusing a drain that loops, rises, or shares a line with a finish floor is the most common cause of water damage after a replacement and is not covered under warranty.
Liability and warranty considerations
The WR2500 is sold under Wine-R’s Terms of Sale and Limited Warranty. Wine-R’s warranty covers unit parts for two years from the original purchase date.
Warranty coverage is voided by, among other conditions:
- Damage from improper installation, poor insulation, or oversized or unsealed rooms
- Use of extension cords, switch-controlled outlets, or non-dedicated circuits
- Use of single-pane or non-insulated glass in the cellar envelope
- Installation through an exterior wall, into a sealed cavity, or into an unventilated cabinet
- Service performed by anyone other than Wine-R or a Wine-R authorized technician
- Damage from drainage installation, blockage, overflow, or any drainage failure
Pre-validation by Wine-R confirms unit fitment against declared measurements only. The owner or installer is responsible for envelope construction, wall structural assessment, electrical compliance, drainage routing, and ongoing operating conditions. Wine-R does not warrant against water damage, mold, finish degradation, or property loss caused by installation, drainage configuration, site conditions, or operating environment.
About this guide
This replacement guide is built and reviewed by the Wine-R engineering team. Wine-R specializes in through-the-wall wine cellar cooling and has supported drop-in replacements across North America. Compatibility methodology follows the WR2500 manufacturer specifications and ASHRAE residential cooling principles.