Looking for a cooling-only split system that delivers reliable comfort across rooms or larger spaces? This guide highlights five top Amazon options, focusing on cooling performance, energy efficiency, and ease of installation. Each model targets a distinct use case—from compact bedrooms to larger living areas and light commercial spaces—so you can pick the best fit for your needs. The buyer profiles below explain who benefits most from each system and why.
Summary of chosen products:
- Rellytech Mini Split AC/Heating System (18000 BTU) — Best for large living spaces and garages that require strong cooling plus heating support.
- MRCOOL 12000 BTU Easy Pro — Best for small to mid-sized rooms where DIY installation is valued.
- MRCOOL 18000 BTU Easy Pro — Best for medium spaces that need robust cooling with simple setup.
- Rellytech 9000 BTU Mini Split — Best for bedrooms or compact offices, prioritizing energy efficiency and quiet operation.
- EXNOS 12000 BTU Mini Split — Best for quiet, energy-conscious spaces up to 750 sq ft.
Rellytech Mini Split AC/Heating System — 18000 BTU (Pre-charged)
The Rellytech 18000 BTU unit delivers 18,000 BTU of cooling and 18,400 BTU of heating, covering up to 1,250 sq ft. This makes it suitable for whole-home comfort, large bedrooms, offices, or garages. It offers four modes (cooling, heating, fan, dry) and an ECO setting to optimize energy use. Airflow is adjustable with four speeds and a 90° vertical swing for even coverage. This model is best for buyers who want strong all-season performance in larger living spaces and can benefit from integrated heating in shoulder seasons.
Best for: Large rooms or spaces that need cooling with backup heating in a single ductless system. Choose this if you require rapid, even airflow and broad coverage. A potential limitation is the higher upfront cost and footprint compared with smaller units.
Key considerations:
- Coverage: Up to 1,250 sq ft
- Modes: Cool, Heat, Fan, Dry
- Energy features: ECO mode and multi-speed fan
MRCOOL 12000 BTU Easy Pro Series — 115V Ductless Inverter Mini Split
This 12,000 BTU unit is designed for spaces up to 550 sq ft. It emphasizes easy DIY installation, which can save time and reduce setup complexity. The inverter technology supports efficient heating and cooling, with a focus on quiet operation to minimize disruption. It’s best for small-to-medium rooms where homeowners want a straightforward install and dependable year-round climate control without central HVAC. A limitation to note is that performance expectations align with the 550 sq ft guideline; larger rooms may require a higher-capacity unit.
Best for: Smaller living rooms, bedrooms, or offices where DIY installation and steady climate control are priorities. Better for: spaces within 550 sq ft. Avoid this if you need coverage beyond ~550 sq ft without stepping up to a higher BTU unit.
Key considerations:
- Coverage: Up to 550 sq ft
- Mode: Heating and cooling with inverter efficiency
- Installation: Easy DIY approach
MRCOOL 18000 BTU Easy Pro Series — 230V Ductless Mini Split
With 18,000 BTU cooling capacity, this unit targets spaces up to 800 sq ft. It’s designed for straightforward DIY installation while offering energy-efficient operation and quiet performance. The system supports reliable year-round comfort for mid-sized homes or small offices. Best for buyers who want robust cooling without sacrificing installation simplicity, though users should confirm electrical capacity and space for a 230V setup in their area.
Best for: Medium-sized rooms or multi-zone setups where strong cooling is required and a DIY install is feasible. Better for: spaces near 800 sq ft. Choose this if you want higher cooling power without complex installation. Be mindful of 230V requirements and suitable wiring in your space.
Key considerations:
- Coverage: Up to 800 sq ft
- Mode: Cooling and heating with inverter
- Installation: DIY-friendly within 230V requirements
Rellytech 9000 BTU Mini Split — 115V/110V
The 9,000 BTU Rellytech unit is compact and well-suited for bedrooms or small offices, delivering rapid temperature control across 61°F to 88°F. It provides four modes with an ECO option to optimize energy use. The 90° vertical swing and four fan speeds ensure flexible comfort in smaller spaces. The trade-off is lower cooling capacity, so it’s not ideal for larger rooms or open-plan layouts.
Best for: Bedrooms, home offices, or small living areas where energy efficiency and quiet operation matter most. Better for: spaces up to ~550 sq ft. Choose this if you need a discreet, low-capacity unit with efficient operation.
Key considerations:
- Coverage: Up to 550 sq ft
- Modes: Cooling, Heating, Fan, Dry
- Quiet operation and ECO mode
EXNOS 12000 BTU Mini Split — 115V
The EXNOS 12,000 BTU unit is designed for rooms up to 750 sq ft with SEER2 19 and HSPF2 8.5, emphasizing energy efficiency and reduced power consumption. ECO mode helps maintain comfort while trimming energy use, and sleep operation can run as quietly as 26dB. This model suits spaces where stable cooling and efficient operation are prioritized, including home offices or small sunrooms. A note: performance caps at about 750 sq ft, so very large spaces may require more capacity.
Best for: Rooms up to 750 sq ft where energy efficiency and quiet operation are key. Better for: home offices, sunrooms, or additions. Choose this if you value low energy use with strong SEER2 performance.
Key considerations:
- Coverage: Up to 750 sq ft
- Energy: SEER2 19, ECO mode
- Quiet: Sleep mode as low as 26dB
Buying Guide
What should you consider when choosing a cooling-only split system?
- Room size and layout: Match BTU to space. Overestimating BTU wastes energy, while underestimating leaves you uncomfortable.
- Electrical requirements: Check voltage (115V vs 230V) and available wiring. Some units require dedicated circuits.
- Energy efficiency: Look for SEER and HSPF ratings; ECO or sleep modes help reduce power use.
- Installation approach: DIY installation saves money but needs space and basic tools. Some markets demand professional setup.
- Noise and comfort: Consider compressor and fan noise, especially for bedrooms and offices.
- Maintenance and durability: Pre-charged systems simplify setup, but confirm warranty logistics and service support.
How to compare models quickly
- Best for large spaces: Look at higher BTU units like 18,000 BTU models.
- Best for small rooms: 9,000–12,000 BTU units with 115V or 230V options.
- Best for energy savings: Compare SEER2 ratings and ECO/sleep modes.
- Best for DIY: Prioritize models advertised as easy installation and pre-charged systems.
FAQ
- What is a cooling-only mini split system good for? It provides targeted cooling for specific rooms or zones without central HVAC.
- Do these systems heat as well as cool? Many are heat pump capable, offering both cooling and heating, but verify BTU for heating needs.
- Is professional installation required? Some models are designed for DIY installation, but local electrical codes may require a licensed technician.
- Do pre-charged systems require refrigerant handling? Pre-charged units simplify setup, but proper handling and refrigerant laws still apply.
- Can these units cool multiple rooms? Some units provide zoned cooling, but you may still need multiple indoor units or a multi-zone system for separate rooms.
- What maintenance does a mini split need? Regular filter cleaning and annual checkups keep efficiency high and airflow clear.