OLMO 8,000 BTU Through-the-Wall AC Review: Sleeve Included
A small 115V cooling-only wall unit with 8,300 BTU/h of cooling, a wall sleeve included, a built-in smart kit for app and voice control and a 49.5 dB listed sound level.
By Daniel Brooks
Updated October 19, 2026
The OLMO 8,000 BTU through-the-wall AC solves the most annoying part of buying a wall unit: it comes with the wall sleeve. That makes it a complete kit for a new opening or a replacement where the old sleeve is damaged. It is a cooling-only unit with 8,300 BTU/h of cooling on a standard 115 volt outlet, a built-in smart kit for app and voice control, and a 49.5 dB listed sound level. It has a 4.9 out of 5 average from 15 ratings, one of the highest scores in our cooling-only through-the-wall air conditioners category, though from a small number of buyers.
Our Verdict
For a bedroom, office or studio where you are starting from scratch, this OLMO is excellent value as a package. You get the unit, the sleeve, a remote and smart control in one box, plus Sleep mode, a timer, auto restart and a self-evaporating system. The low listed sound level makes it a good bedroom candidate.
The trade-offs are a thin listing and weight. OLMO does not publish a room size, an efficiency figure or wattage for this model, and the unit weighs 80 pounds. The SKU in the feature list (OW-P08AC115WF) also differs from the model number in the specs (OW-A08AC115WF), so confirm the exact model with the seller if that matters to you.
OLMO 8,000 BTU Through-the-Wall Air Conditioner
As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated.
Key Specifications
| Feature | Specification |
|---|---|
| Brand | OLMO |
| Model | OW-A08AC115WF (SKU OW-P08AC115WF listed) |
| Type | Smart cooling-only through-the-wall air conditioner |
| Cooling Capacity | 8,300 BTU/h |
| Power | 115V, 1 phase, 60Hz |
| Refrigerant | R-32 |
| Noise Level | 49.5 dB (listed) |
| Controls | Push button panel with LED display, remote, smartphone app, voice |
| Dimensions | 24.21 x 14.53 x 20.28 inches (W x H x D) |
| Weight | 80 pounds |
| In the Box | Unit, wall sleeve, remote, built-in smart kit |
| Warranty | 1 year limited |
Cooling Capacity and Room Size
OLMO lists 8,300 BTU/h of cooling but does not give a room size. Using the ENERGY STAR chart below, a unit in the 8,000 BTU class suits rooms of roughly 300 to 350 square feet. That covers a typical bedroom, a nursery, a home office or a small studio. For a living room or a sunny top-floor room, a 10,000 or 12,000 BTU class unit is the safer choice.
OLMO describes the unit as suitable for apartments, condos, bedrooms, garages, offices, studios and hotel rooms.
ENERGY STAR publishes this general guide for sizing a room air conditioner by floor area:
| Room Size (sq ft) | Cooling Capacity (BTU/hr) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
Adjust for your room: reduce capacity by 10 percent for a heavily shaded room, increase it by 10 percent for a very sunny room, add 600 BTU for each regular occupant beyond two, and add 4,000 BTU if the unit cools a kitchen. Source: ENERGY STAR.
The Sleeve Is Included
Most wall units, including LG, Frigidaire, Whirlpool and TCL, ship without a sleeve. A separate sleeve adds cost and another fit check, and a mismatched sleeve is one of the most common causes of drafts, leaks and noise. OLMO’s sleeve-included listing removes that guesswork, because the sleeve is made for the unit.
That matters most in two situations. In a new installation, you can frame the opening to the sleeve and be confident the unit will fit. In a replacement where the old sleeve is rusted, bent or the wrong size, you can replace both at once. If you already have a good sleeve that fits, OLMO also sells the same unit without one.
Smart Control
OLMO builds the smart kit into the unit rather than selling a plug-in module. You can run it from the push button panel with its LED display, the included remote, or a compatible smartphone, and the listing names voice control as well. The remote adds Sleep mode, a timer and auto restart after a power cut.
Power and Installation
The unit runs on 115V, single phase, 60Hz. OLMO asks buyers to confirm they have the right receptacle before ordering, which in this case is a standard household outlet. The chassis measures 24.21 inches wide, 14.53 inches tall and 20.28 inches deep.
At 80 pounds, it is heavy for an 8,000 BTU class unit, so plan for two people. Install the sleeve first, seal it to the wall, check it tilts slightly toward the outside for drainage, then slide the chassis in.
Noise and Condensate
OLMO lists 49.5 dB, one of the lowest figures among the wall units we cover. For a bedroom, that is a real advantage. The self-evaporating system uses condensate to help cool the condenser, which can reduce dripping outside in normal conditions. In very humid weather, some water may still drain from the rear, so keep the area below the unit clear of anything that could be damaged by drips.
Planning a New Wall Opening
Cutting a new opening is a bigger job than swapping a unit, so it pays to plan. Check first whether your lease, condo association or local building code allows a new opening in an exterior wall. Then find the studs and any wiring or plumbing before you cut. Most installers place the opening high enough to throw air across the room but low enough to reach the controls, and close to an existing outlet so the cord does not trail across the wall.
Frame the opening with a header, fit the sleeve, and seal the gap between sleeve and wall on both sides. Outside, flash or caulk the top edge so rain runs off rather than into the wall. If you are not comfortable with framing and exterior sealing, a handyman or HVAC installer can usually complete the job in a few hours.
Who It Suits Best
This OLMO suits bedrooms, nurseries, offices and studios where you need a complete wall unit and sleeve kit, want app or voice control, and value a low sound level. It is less suited to large rooms, buyers who want detailed efficiency and wattage figures, or rooms that need heat.
Pros and Cons
| Pros | Cons |
|---|---|
| Wall sleeve included | No published room size |
| Built-in smart kit, app and voice | No efficiency or wattage listed |
| 49.5 dB listed sound level | Heavy at 80 pounds |
| Runs on a standard 115V outlet | Model number differs in listing |
| Sleep, timer and auto restart | 1 year limited warranty |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| New wall openings | Large living rooms |
| Replacements with a damaged sleeve | Buyers who want full specs |
| Smart home users in small rooms | Rooms that need heat |
| Light sleepers | Anyone with a good existing sleeve |
For more choices, see our picks for the best smart through-the-wall air conditioners and the best through-the-wall air conditioners for bedrooms.
Final Verdict
The OLMO 8,000 BTU through-the-wall AC is a complete, quiet and smart package for small rooms, and the included sleeve makes it one of the easiest wall units to install from scratch. Accept a thinner spec sheet in exchange. You can check the current price and details for the OLMO 8,000 BTU Through-the-Wall Air Conditioner.
Frequently Asked Questions
Does the OLMO 8,000 BTU wall unit include a sleeve?
Yes. This listing includes the wall sleeve, a remote and the built-in smart kit.
How much cooling does it provide?
OLMO lists 8,300 BTU/h of cooling.
Does it need a special outlet?
No. It runs on 115V, single phase, 60Hz.
How loud is it?
OLMO lists 49.5 dB.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.