OLMO OW-P14HS230WF Review: 14,000 BTU 230V Wall AC and Heater
OLMO's largest heat and cool wall unit, with 14,000/13,600 BTU/h cooling, 10,600/8,600 BTU/h heating, a built-in smart kit and a 49.5 dB listed sound level.
By Daniel Brooks
Updated October 22, 2026
The OLMO OW-P14HS230WF is the largest model in OLMO’s heat and cool wall lineup. It is rated at 14,000/13,600 BTU/h of cooling and 10,600/8,600 BTU/h of heating at 230 and 208 volts, uses R-32 refrigerant, and has a built-in smart kit for app and voice control. OLMO lists an unusually low 49.5 dB for a unit this size. It has a 3.4 out of 5 average from 8 ratings, a small sample, in our through-the-wall air conditioners with heat category.
Our Verdict
This OLMO is aimed at bigger spaces: an open living area, a studio apartment, a garage workshop or a large office with a 208/230 volt outlet beside the sleeve. The cooling section has more muscle than the 12,000 BTU models most apartments use, and the 10,600 BTU/h heater gives real warmth on cool days. App, voice, remote and push button control make it easy to manage across both seasons.
Two points deserve attention before you buy. The rating is based on only 8 ratings, so it is too early to judge long-term reliability with confidence. The wall sleeve is also sold separately. If your room is under about 450 square feet, the 12,000 BTU OLMO is the better match, because an oversized unit cycles on and off and removes less humidity.
OLMO 14,000 BTU 230V Through-the-Wall AC & Heater
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | OLMO |
| Model | OW-P14HS230WF |
| Type | Smart through-the-wall air conditioner with heat |
| Cooling Capacity | 14,000/13,600 BTU/h (230V/208V) |
| Heating Capacity | 10,600/8,600 BTU/h (230V/208V) |
| Power | 208/230V, 1 phase, 60Hz |
| Refrigerant | R-32 |
| Efficiency | 9.5 (listed) |
| 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 |
| Wall Sleeve | Sold separately |
| Warranty | 1 year limited |
Cooling Capacity and Room Size
OLMO rates the cooling at 14,000 BTU/h on 230 volts and 13,600 BTU/h on 208 volts. The listing does not give a square footage, but on the ENERGY STAR chart below, 14,000 BTU lines up with rooms of roughly 550 to 700 square feet. That covers a large open living and dining area, a studio apartment, or a bonus room with high sun exposure.
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 listing names apartments, condos, bedrooms, garages, offices and studios as suitable rooms. For a bedroom, this unit only makes sense if the room is very large or very sunny.
Heating Performance
The heater is rated at 10,600 BTU/h at 230 volts and 8,600 BTU/h at 208 volts, the same heating section used on the 12,000 BTU OLMO. That is strong output for a wall unit and enough to warm a medium room quickly on a cool morning. In a very large room, it acts as solid supplemental heat rather than a complete replacement for a furnace during a hard winter.
Like every electric heater, it costs more to run per hour than a gas furnace or heat pump, so it is most economical in mild climates, in shoulder seasons, or for zoning a single room so the central system can run less.
Power and Electrical Requirements
The unit is built for 208/230V, single phase, 60Hz power. OLMO asks buyers to check that they have the correct receptacle before ordering, and that is worth doing, because a higher voltage outlet is different from a standard household outlet. Many apartment buildings with existing wall units already have the right receptacle at the sleeve.
Installation and Sleeve Fit
The chassis measures 24.21 inches wide, 14.53 inches tall and 20.28 inches deep, the same body as the 12,000 BTU OLMO, with a minimum opening width of 24 inches. The wall sleeve is not included in this listing and is sold separately. At 80 pounds, plan on two people to lift it into place. A level sleeve with a slight outward tilt helps condensate drain properly.
Smart Controls and Everyday Use
The built-in smart kit gives you app control and voice control in addition to the LED push button panel and the included remote. You can warm or cool the room before you arrive, adjust the set point from another room, or run a schedule. OLMO also lists sleep mode, a timer, auto restart after a power outage and a self evaporating system for condensate.
Noise and Efficiency
OLMO lists 49.5 dB, which is one of the lowest sound figures we have seen on a heat and cool wall unit, and remarkably low for 14,000 BTU. Treat listed sound figures as a guide, since brands measure them in different ways, but it suggests this unit is suited to living spaces where quiet matters. The listing also cites an efficiency figure of 9.5, which is typical for a conventional wall unit.
Who It Suits Best
The OW-P14HS230WF suits large rooms and open spaces with a 208/230 volt outlet, where you want both strong cooling and real heat with smart control. It also suits small offices and studios that need a single appliance for the whole year. It is less suited to small bedrooms, homes with only standard outlets, or buyers who want a model with a long track record of ratings.
Pros and Cons
| Pros | Cons |
|---|---|
| 14,000 BTU/h cooling for large rooms | Only 8 ratings so far |
| Heater rated at 10,600 BTU/h on 230V | Needs a 208/230V outlet |
| 49.5 dB listed sound level | Sleeve sold separately |
| App, voice, remote and panel control | Too large for most bedrooms |
| R-32 refrigerant | No room size listed |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Large living areas and studios | Small and medium bedrooms |
| Rooms with a 230V sleeve outlet | Homes with only standard outlets |
| Smart home users | Buyers wanting a proven rating history |
| Offices and garages needing heat | Cold climates needing primary heat |
For more choices, see our picks for the best 230V through-the-wall air conditioners with heat and the best smart through-the-wall air conditioners with heat.
Final Verdict
The OLMO OW-P14HS230WF brings big cooling capacity, a strong heater, smart control and a low listed sound level to one wall unit. The small number of ratings is the main reason for caution. If you have a large room and a 208/230 volt outlet, it is one of the most capable heat and cool options available. You can check the current price and details for the OLMO 14,000 BTU 230V Through-the-Wall AC and Heater.
Frequently Asked Questions
How much heat does the OLMO 14,000 BTU unit produce?
OLMO lists 10,600 BTU/h of heat at 230 volts and 8,600 BTU/h at 208 volts.
How loud is it?
OLMO lists a sound level of 49.5 dB.
What outlet does it need?
It needs 208/230V, single phase, 60Hz power. Check your receptacle before ordering.
Does it include a wall sleeve?
No. The sleeve is sold separately.
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.