OLMO Sierra 36,000 BTU 4-Zone 9k+9k+9k+9k Wall Mount, 230V, R410A - Ductless Mini Split Air Conditioner Heat Pump | No Kit
OLMO5-Yr Warranty
Product specifications
| Brand | |
|---|---|
| Voltage | |
| SEER | |
| WiFi | |
| Zone | |
| Type | |
| Freon | |
| Compressor |
Please note that all delivery dates and estimated transit times are approximate and are not guaranteed. Delivery times may vary due to carrier delays, weather, holidays, peak shipping periods, or other circumstances beyond our control. How delivery dates are calculated
Pickup currently unavailable at Medley Warehouse
Questions about this system?
Answers in seconds — tap a question below
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Covers about 1400–1800 sq ft total, split across its indoor units — each head handles its own room, so you put the right capacity where you need it. Rule of thumb: ~20 BTU per sq ft, and 12,000 BTU = 1 ton (this system is 36,000 BTU (3-ton)). Want help splitting the zones? Our team can map it out.
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12,000 BTU = 1 ton — "tons" is just the older way of stating capacity. So 24,000 BTU = 2 tons, 36,000 = 3 tons, and so on. This system is 36,000 BTU (3-ton). BTU tells you the capacity; SEER2 tells you the efficiency.
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It uses R410A — a proven, widely serviced refrigerant. The outdoor unit ships pre-charged for a standard line set, so most installs need no extra refrigerant; your licensed, EPA-608-certified installer verifies the charge and tops it off if your line set is longer.
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Rated SEER2 21.0 — a strong efficiency number, and the higher it is the lower your energy bills. Its inverter compressor ramps up and down instead of cycling on/off, so it holds the temperature steadily, runs quietly, and uses less power than a standard AC or window unit.
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Needs a dedicated 230V circuit, like a large household appliance, so it can deliver full capacity to larger rooms and multi-zone setups. Your licensed HVAC installer or electrician sets up the correct breaker and disconnect to meet local electrical code.
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Yes — a big upgrade. It's far more efficient (inverter, SEER2 21.0) and much quieter, since the compressor sits outside instead of in your window or on the floor. It mounts permanently, doesn't block a window, and heats as well as cools year-round. Higher upfront cost, but lower bills and a longer lifespan.
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Yes to all three. It's an inverter heat pump — cools in summer, heats in winter (even in the cold), far more efficiently than electric heaters. A Dry mode also pulls out humidity, so rooms feel cooler and less muggy.
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Yes. Each indoor unit has its own remote/thermostat — set different temperatures or turn one off, so you only condition the rooms you use and save energy on the ones you're not. One outdoor unit powers them all, keeping install and running costs lower than separate systems per room.
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Yes — WiFi is included, so you can set schedules, change the temperature, and even turn it on before you get home, all from the mobile app (and pair it with voice assistants). A standard remote is included too.
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Ships as a complete set: OS-MSR36-230VO, OS-M09SRW-230VI, OS-M09SRW-230VI, OS-M09SRW-230VI, OS-M09SRW-230VI. Everything arrives together — check the photos and specs for the full kit.
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It should be installed by a licensed, EPA-608-certified HVAC professional — we don't recommend DIY installation. Handling refrigerant requires EPA Section 608 certification under U.S. law, and professional installation keeps the system safe, code-compliant, and your manufacturer warranty valid.
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Yes — you get full inverter heat-pump technology and the same core features as premium brands without paying for the name, which is how we keep prices low. Shipping is free on items over $300 within the U.S., and our team can help with sizing and support.
Important info
- R-410A is being phased down in favor of newer refrigerants; inventory is limited.
- Existing R-410A systems remain serviceable; parts and qualified service are widely available.
- Check local codes and rebates. Some incentives prioritize high-efficiency heat pumps (R-32/R-454B).
- We stock both R-410A and next-gen options—choose what fits your timeline and budget.
Browse: R-410A systems · R-32 · R-454B
Why buy this mini split from MiniSplitsForLess
- Free Shipping on items over $300Ships free to the lower 48 states — flat rate, no surprises at checkout.
- USA-Based Expert SupportReal U.S. HVAC pros help with BTU sizing, refrigerant and install questions.
- Genuine Units & Full WarrantyBrand-new, authorized-dealer equipment backed by the full manufacturer warranty.
- Fast Nationwide ShippingIn stock and ready to ship from U.S. warehouses across all 48 states.
What Stands Out
Complete 4-Zone System
Heat or cool 4 rooms independently from one 36000 BTU outdoor unit (9K+9K+9K+9K) — every zone sets its own temperature, delivered by wall mount indoor units.
Inverter Efficiency — SEER2 21
A variable-speed inverter compressor ramps to match the load instead of cycling on/off, holding SEER2 21 on 230V — steady comfort with noticeably lower energy bills.
Right-Sized Coverage
Engineered to heat & cool up to 1400–1800 sq ft across 4 zones — matched capacity so you never over- or under-size the space.
Sierra Wall Mount
OLMO's Multi-Zone Sierra Series is a versatile HVAC solution designed to provide efficient heating and cooling for multiple rooms, equipped with advanced inverter technology for precise temperature control and significant energy savings. Using eco-friendly R410A refrigerant, the system ensures reliable performance with minimal environmental impact. Perfect for residential or commercial applications, the Sierra Series offers quiet operation, flexible installation, and user-friendly controls, making it an ideal choice for maintaining year-round comfort across multiple zones with one efficient system.
Warranty and Tech Support Info
By selecting OLMO products for your home or business, you’ll receive expert technical support from heating and cooling specialist, including access to product manuals, troubleshooting guides and warranty information.
The manufacturer provides a Limited Warranty of 5 years for the compressor and 2 years for parts.
Warranty terms
Main Features
OLMO's Multi-Zone Sierra Series delivers efficient multi-room comfort with advanced inverter technology for precise temperature control. Its eco-friendly R410A refrigerant reduces environmental impact, while quiet operation ensures minimal disruption. With flexible installation options, sleek design, and reliable heating and cooling, it’s the perfect solution for modern multi-zone climate control needs.
All Accessories Included
With your purchase, you receive a comprehensive MiniSplit system. MiniSplits4Less ensures you have everything needed for a seamless installation. Your package includes an Indoor Unit, Outdoor Unit, Remote Control, Manuals, optional LineSet, and a Smartkit (WIFI). We've meticulously thought of every detail to provide you with all the essentials for your installation.
Technical Specifications
Indoor Unit Specs
| Model | OS-M09SRW-230VI |
|---|---|
| Unit Dimensions (WxDxH) | 32.02x10.75x8.13 in |
| Net/Gross Weight | 19.84/24.25 lb |
| Packing Dimensions (WxDxH) | 39.38x13.19x6.38 in |
| Power Supply | 208-230V, 1Ph, 60Hz |
| Noise Level (Hi/Med/Lo) | 39/35/30 dB |
Outdoor Unit Specs
| Model | OS-MSR36-230VO |
|---|---|
| Net/Gross Weight | 188.5/220.5 lb |
| Power Supply | 208-230V, 1Ph, 60Hz |
| Maximum Fuse Size | 50 A |
| Min. Circuit Ampacity | 32.2 A |
| Copper Line Size (Liquid/Gas) | 1/4"/3/8" |
| Noise Level | 59 dB |
| Airflow | 3.411 CFM |
System Specs
| Cooling Capacity | 36,000 BTU |
|---|---|
| SEER2 | 21 |
| Zones | 4 |
| Voltage | 230V |
| Refrigerant Type | R410A |
| Compressor | Inverter |
| WiFi | Included |
| Heating Capacity | 36,000 BTU/h |
| Cooling Capacity Range | 32,000 BTU/h |
| Operating Range (Cooling) | 14~114.8 °F |
| Operating Range (Heating) | -13~75.2 °F |
| Refrigerant Precharge | 25 ft |
| Max Height Difference | 15 ft |
| COP | 3.37 |
Series Comparison Table
Technical specifications for every model in the Sierra series — this product is one of them.
| Indoor Models | OS-M09SRW-230VI | OS-M12SRW-230VI | OS-M18SRW-230VI | OS-M24SRW-230VI |
|---|---|---|---|---|
| Power Supply V-Ph-Hz | 208/230V-1Ph-60 | 208/230V-1Ph-60 | 208/230V-1Ph-60 | 208/230V-1Ph-60 |
| Cooling | ||||
| Capacity Btu/h | 9000 | 12000 | 18000 | 23400 |
| Heating | ||||
| Rated Capacity Btu/h | 9500 | 13000 | 19000 | 26000 |
| Output Power W | 25 | 25 | 35 | 35 |
| Rated Current A | 0.11 | 0.11 | 0.17 | 0.17 |
| Indoor Air Flow CFM | 341 | 365 | 647 | 706 |
| Indoor Noise Level (Hi/Mi/Lo) dB(A) | 39/35/30 | 39/35/30 | 45/41/37 | 47/45/42 |
| Net Dimensions (WxHxD) in | 32.02x10.75x8.13 | 37.38x10.75x8.13 | 48x12.63x9.25 | 48x12.63x9.25 |
| Packing (WxHxD) in | 39.38x13.19x6.38 | 39.38x13.19x6.38 | 51.75x15.44x12.50 | 51.75x15.44x12.50 |
| Net/Gross Weight lbs | 19.84 / 24.25 | 19.84 / 24.25 | 31.97 / 37.48 | 31.97 / 37.48 |
| Refrigerant Piping | ||||
| Liquid Side / Gas Side in | 1/4" / 3/8" | 1/4" / 3/8" | 1/4" / 1/2" | 3/8" / 5/8" |
| Outdoor Models | OS-MSR18-230VO | OS-MSR24-230VO | OS-MSR36-230VO | OS-MSR42-230VO |
|---|---|---|---|---|
| Power Supply V-Ph-Hz | 208/230V-1Ph-60 | 208/230V-1Ph-60 | 208/230V-1Ph-60 | 208/230V-1Ph-60 |
| Capacity Btu/h | 18000 | 24000 | 32000 | 42000 |
| Cooling | ||||
| EER2 Btu/h | 12.5 | 12.5 | 12.5 | 10.5 |
| SEER2 Btu/h | 21.0 | 22.0 | 21.0 | 20.0 |
| Heating | ||||
| Rated Capacity Btu/h | 18000 | 24000 | 36000 | 42000 |
| HSPF2 Btu/h | 9.50 | 9.05 | 9.00 | 8.95 |
| COP2 W/W | 3.45 | 3.66 | 3.37 | 3.17 |
| Minimum Circuit Ampacity A | 23 | 25 | 32.2 | 35 |
| Max Fuse A | 30 | 30 | 50 | 50 |
| Outdoor Air Flow (Hi) CFM | 1850 | 2350 | 3411 | 3411 |
| Outdoor Side Noise Level dB(A) | 55 | 55 | 59 | 63 |
| Dimensions (WxHxD) in | 33.88×26.38×12.25 | 37.38×33×13.38 | 37.38×41.38×13.38 | 37.38×41.38×13.38 |
| Outdoor Unit Packing (WxHxD) in | 39×17.75×28.75 | 43.75×18.13×36.25 | 43.75×18.13×47.25 | 43.75×18.13×47.25 |
| Net/Gross Weight lbs | 116.8/125.6 | 158.7/169.5 | 188.5/220.5 | 198.4/224.5 |
| Refrigerant | ||||
| Refrigerant Type/Quantity oz | R410A/63.49 | R410A/81.13 | R410A/105.82 | R410A/120 |
| Refrigerant Precharge ft | 50 | 75 | 98 | 98 |
| Refrigerant Piping | ||||
| Liquid Side / Gas Side in | 1/4" / 3/8" | 1/4" / 3/8" | 1/4" / 3/8" | 1/4" / 3/8" |
| Max Refrigerant Pipe Length Each/Total ft | 82/164 | 66/197 | 66/246 | 66/262 |
| Ambient Temperature | ||||
| Outdoor (Cooling) °F | 14~114.8 | 14~114.8 | 14~114.8 | 14~114.8 |
| Outdoor (Heating) °F | -13~75.2 | -13~75.2 | -13~75.2 | -4~75.2 |
What’s Included
| Outdoor condenser | OS-MSR36-230VO |
|---|---|
| Indoor unit | OS-M09SRW-230VI |
| Indoor unit | OS-M09SRW-230VI |
| Indoor unit | OS-M09SRW-230VI |
| Indoor unit | OS-M09SRW-230VI |
Installation kit is not included in the selected option — pick 16ft, 25ft or 50ft above to add one.
Shipping & Returns
- Free shipping on every item over $300.
- Delivery estimate for your ZIP is shown in the buy box above.
- Returns accepted per our policy — unopened units in original packaging.
Warranty
5-year manufacturer warranty
- Limited manufacturer warranty on the compressor and sealed system components.
- Your order number is the proof of purchase — keep it for any claim.
Multiple Control Methods
Olmo’s can be managed with a user-friendly remote control. This options offer precise temperature adjustments and optimal climate control for ultimate convenience.
Frequently Asked Questions
How many rooms can the Olmo 4 Zone 36,000 BTU mini split cool?
The Olmo 4 Zone 36,000 BTU system is designed to efficiently cool up to four separate rooms, making it ideal for multi-zone applications. With a coverage area of up to 1,500 sq ft, this system provides targeted comfort throughout your home.
Can I mix BTU sizes with the Olmo mini split system?
Yes, you can mix BTU sizes when using the Olmo 4 Zone mini split system, although it is recommended to maintain balanced loads for optimal performance. The total BTU capacity of 36,000 allows for flexible configurations across the zones, as long as the combined demand does not exceed this limit.
Do all zones in the Olmo mini split run simultaneously?
The Olmo 4 Zone mini split allows for independent control of each zone, meaning you can choose to heat or cool all zones simultaneously or operate them individually based on your needs. This feature provides both energy efficiency and personalized comfort.
Why should I choose the Olmo mini split over multiple single-zone units?
Choosing the Olmo 4 Zone 36,000 BTU mini split can be more efficient than multiple single-zone units, thanks to its higher SEER rating of 21.0, which indicates superior energy efficiency and potential cost savings on your utility bills.
What warranty does the Olmo mini split offer?
The Olmo 4 Zone mini split system comes with a generous 5-year parts and compressor warranty, ensuring peace of mind with your investment. This warranty covers essential components, providing you with reliable support for years to come.
Does the Olmo mini split come pre-charged with refrigerant?
Yes, the Olmo 4 Zone mini split system is pre-charged with R410A refrigerant for up to 25 ft of line set, simplifying the installation process. This means you can install it without the need for additional refrigerant under typical conditions.
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