19 SEER2 or 21 SEER2 Mini Splits? Compared by Specs
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Choosing between a 19 SEER2 vs 21 SEER2 mini split depends on your specific efficiency and connectivity needs. Both Albott and Rellytech offer 18,000 BTU cooling capacity and heat pump functionality for year-round comfort. The Albott model covers larger spaces up to 1250 sq. ft. with a 19 SEER2 rating. The Rellytech unit targets smaller areas up to 750 sq. ft. but achieves a higher 21 SEER2 efficiency rating. It also includes built-in Wi-Fi for remote control, which the Albott lacks. These specs define their ideal use cases.
Key differences
| Aspect | Albott 18k BTU 230V Mini Split | Rellytech 18k BTU 21 SEER2 Mini Split |
|---|---|---|
| Efficiency Rating | 19 SEER2 | 21 SEER2 |
| Coverage Area | up to 1250 sq. ft. | up to 750 sq. ft. |
| Smart Control | not listed | Wi-Fi, voice commands |
| Operating Temperature Range | -4°F to 140°F | -13°F to 122°F |
| Refrigerant | not listed | R454B |
Which one should you choose?
Choose Albott 18k BTU 230V Mini Split if
- You need to cool a larger space up to 1250 sq. ft.
- You require operation in extreme heat up to 140°F
- You prefer a simpler control interface without smart features
Choose Rellytech 18k BTU 21 SEER2 Mini Split if
- You want higher energy efficiency with a 21 SEER2 rating
- You need remote control via Wi-Fi and smartphone apps
- You are installing in a smaller space up to 750 sq. ft.
Verdict: The Albott is better for larger rooms and high-temperature environments where smart features are not essential. The Rellytech suits smaller spaces where higher efficiency and remote connectivity are priorities. Your choice depends on whether you value coverage area or advanced control features.
19 SEER2 vs 21 SEER2 Specs
Efficiency Rating
The Rellytech model offers a 21 SEER2 efficiency rating, while the Albott unit provides 19 SEER2. A higher SEER2 number indicates better energy efficiency during cooling operation. This means the Rellytech system converts more electricity into cooling output, potentially lowering your energy consumption compared to the Albott model. Both units maintain this rating as a core specification for their 18,000 BTU capacity. If minimizing energy usage is your primary goal, the 21 SEER2 rating gives the Rellytech an advantage in operational efficiency.
Coverage Area
The Albott mini split is rated to cover spaces up to 1250 square feet. In contrast, the Rellytech unit specifies a coverage area of up to 750 square feet. This significant difference suggests the Albott model is designed for larger open areas or rooms with less insulation constraints. The Rellytech model targets smaller, more contained spaces like bedrooms or offices. You should choose the Albott if your room is closer to the 1250 square foot mark, while the Rellytech is better suited for the smaller 750 square foot range.
Smart Control
The Rellytech system includes built-in Wi-Fi connectivity, allowing you to control the unit via a smartphone app or voice commands. It also features a remote with a digital display for direct operation. The Albott specifications do not mention Wi-Fi or smart home integration, listing only standard features like a 24-hour timer and sleep mode. If you want to adjust temperatures remotely or integrate the unit into a smart home ecosystem, the Rellytech provides this capability, whereas the Albott relies on local controls.
Operating Temperature Range
The Albott unit is built to operate in extreme conditions, with a specified working range from -4°F to 140°F. The Rellytech system has a working range from -13°F to 122°F. The Rellytech model can handle colder outdoor temperatures down to -13°F, which may be advantageous in colder climates for heating performance. The Albott model tolerates higher outdoor temperatures up to 140°F. Depending on your local climate extremes, one unit may be more suitable than the other for consistent performance in harsh weather.
Refrigerant Type
The Rellytech unit utilizes R454B refrigerant, which is noted for better indoor and outdoor air quality and is ETL and AHRI certified. The Albott specifications do not list the specific refrigerant type used in its heat pump system. R454B is a modern, lower-global-warming-potential refrigerant. If the specific type of refrigerant and its environmental impact are important to you, the Rellytech provides this detail, while the Albott data does not specify the refrigerant used.
Which Mini Split Should You Choose
Users needing wide area coverage
The Albott unit covers up to 1250 sq. ft., making it ideal for larger rooms or open layouts. It operates on 208-230V and provides 18,000 BTU of cooling. This capacity ensures consistent comfort across broader spaces without the limitations of smaller coverage areas found in other models.
Buyers prioritizing highest efficiency
The Rellytech model features a 21 SEER2 rating, which is higher than the Albott’s 19 SEER2. This indicates better energy efficiency during cooling. If minimizing electricity usage is your top priority, this higher rating offers a measurable advantage in operational efficiency for your specific climate needs.
Shoppers wanting smart connectivity
Rellytech includes Wi-Fi and voice command support, allowing control via smartphone. The Albott listing does not mention smart features. If you want to adjust settings remotely or use voice assistants, this connectivity adds convenience that the Albott model lacks based on its published specifications.
Those preferring self-cleaning features
The Albott unit includes a self-cleaning function that runs for 30 minutes and reminds you every 500 hours. This helps reduce dust buildup automatically. The Rellytech specs do not list this specific maintenance feature, making the Albott a practical choice for hands-off upkeep.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Albott 18k BTU 230V Mini Split | 208-230V homes needing reliable cold-weather heating | Check price of Albott 18k BTU 230V Mini Split on Amazon |
| 2 | Rellytech 18k BTU 21 SEER2 Mini Split | Medium rooms needing high efficiency and smart control | Check price of Rellytech 18k BTU 21 SEER2 Mini Split on Amazon |
The products compared
Albott 18k BTU 230V Mini Split
Best for: 208-230V homes needing reliable cold-weather heating
- Efficiency Rating
- 19 SEER2 (what this guide is about)
- Cooling Capacity
- 18,000 BTU
- Voltage
- 208-230V
- Coverage Area
- up to 1250 sq. ft.
- Heat Pump
- Heat Pump
- Target Space
- Office
View on Amazon: Albott 18k BTU 230V Mini Split Affiliate link
This Albott unit delivers 18,000 BTU of cooling and heating power with a 19 SEER2 efficiency rating. It operates on 208-230V power and covers up to 1250 square feet. The system includes dehumidifying and fan modes, plus a 24-hour timer and sleep mode. You get stable performance in temperatures ranging from -4°F to 140°F. The indoor unit measures 37.8 inches wide and weighs 151 pounds. It features self-cleaning technology to reduce dust buildup.
Pros
- 19 SEER2 energy efficiency rating
- 18,000 BTU cooling and heating capacity
- Operates on 208-230V power
- Self-cleaning function at 135°F
- Wide operating temperature range (-4°F to 140°F)
Cons
- Lower 19 SEER2 rating compared to 21 SEER2 alternatives
- Heavier 151-pound unit requires sturdy mounting
- Limited to 1250 sq. ft. coverage area
Good fit if
- You need a 208-230V system for larger rooms
- You want a 19 SEER2 efficiency level
- You require heating down to -4°F
Skip if
- You need the highest 21 SEER2 efficiency available
- You only have 115V electrical outlets
- You need coverage for spaces larger than 1250 sq. ft.
Verdict: Albott 18k BTU 19 SEER2 Heat Pump suits buyers who need robust 208-230V performance and reliable heating in cold weather. It is a practical option for medium-sized spaces where 19 SEER2 efficiency meets your budget and power requirements.
Rellytech 18k BTU 21 SEER2 Mini Split
Best for: Medium rooms needing high efficiency and smart control
- Efficiency Rating
- 21 SEER2 (what this guide is about)
- Cooling Capacity
- 18,000 BTU
- Voltage
- 208V/230V
- Coverage Area
- Up to 1250 sq ft
- Heat Pump
- Heat Pump
- Smart Connectivity
- Wi-Fi, Voice control, Smartphone app
View on Amazon: Rellytech 18k BTU 21 SEER2 Mini Split Affiliate link
This Rellytech unit offers 18,000 BTU cooling and heating for spaces up to 750 square feet. It achieves a 21 SEER2 efficiency rating, making it significantly more energy-efficient than standard 17 SEER2 models. The system includes Wi-Fi connectivity for remote control via smartphone or voice commands. It operates on 230V power and uses R454B refrigerant. This model suits homeowners seeking high efficiency and smart features for medium-sized rooms.
Pros
- 21 SEER2 efficiency rating for lower energy consumption
- Wi-Fi and voice command smart control capabilities
- Pre-charged with R454B refrigerant for better air quality
- Operates in temperatures from -13°F to 122°F
- Includes digital display remote for direct operation
Cons
- Higher capacity than the 19 SEER2 alternative on this list
- Requires 230V electrical connection, limiting placement options
- Ships in two separate boxes which may arrive on different days
Good fit if
- You need a high-efficiency unit for a room up to 750 sq ft
- You want to control your climate via smartphone or voice
- You have a 230V electrical outlet available for installation
Skip if
- You only have a standard 115V outlet
- You prefer a smaller 12,000 BTU unit
- You want a single-box delivery experience
Verdict: Rellytech 18k BTU 21 SEER2 Mini Split delivers top-tier efficiency and smart control for medium-sized spaces. It is the right choice if you prioritize energy savings and remote management over a lower capacity option.
Specifications side by side
| Spec | Albott 18k BTU 230V Mini Split | Rellytech 18k BTU 21 SEER2 Mini Split |
|---|---|---|
| Cooling Capacity | 18,000 BTU | 18,000 BTU |
| Efficiency Rating | 19 SEER2 | 21 SEER2 |
| Voltage | 208-230V | 208V/230V |
| Coverage Area | up to 1250 sq. ft. | Up to 1250 sq ft |
| Heat Pump | Heat Pump | Heat Pump |
| Smart Connectivity | not stated | Wi-Fi, Voice control, Smartphone app |
| Smart Control | not stated | Wi-Fi |
| Target Space | Office | not stated |
| Dimensions | 37.8 × 8.74 × 12.4 inches | 9.45 × 39.6 × 12.4 inches |
| Weight | 151 pounds | 95.1 pounds |
| Size | 19 SEER2, 18,000BTU 208-230V | 18000BTU,230V,21 SEER2-WiFi |
| Color | White | White |
| Model | SAC011 | CE0-1 |
Frequently asked questions
Is 21 SEER2 worth the upgrade from 19 SEER2?
The upgrade matters if you prioritize energy savings and smart features. The Rellytech 21 SEER2 model offers higher efficiency than the Albott 19 SEER2 unit. It also includes Wi-Fi connectivity for remote management. If you want modern control and lower running costs, the higher rating provides tangible benefits for your daily usage.
Do both models support 208V and 230V power?
Yes, both units are designed for 208-230V electrical systems. The Albott 18k BTU model explicitly lists 230V compatibility. The Rellytech 18k BTU unit also operates on 230V. This standard voltage range ensures compatibility with most residential electrical setups without requiring special industrial wiring or transformers.
Which mini split is better for cold weather heating?
The Albott 19 SEER2 model is noted for reliable cold-weather heating. It is described as a practical option for buyers needing robust performance in lower temperatures. While both are heat pumps, the Albott unit is specifically highlighted for its heating reliability, making it a strong choice for colder climates.
Can I control the 21 SEER2 unit remotely?
Yes, the Rellytech 21 SEER2 mini split supports Wi-Fi smart control. This feature allows you to manage the unit remotely via a smartphone or network connection. The Albott 19 SEER2 model does not list smart connectivity in its specifications, so remote control is not available for that specific unit.
How do the physical dimensions compare between the two?
The Rellytech unit is slightly wider at 39.6 inches compared to the Albott’s 37.8 inches. However, the Albott model is taller at 12.4 inches versus the Rellytech’s 9.5 inches. The Rellytech unit also weighs significantly less at 95.1 pounds, while the Albott weighs 151 pounds, affecting installation weight requirements.
Is the cooling capacity the same for both systems?
Yes, both units provide 18,000 BTU of cooling capacity. The Albott model is rated for 18,000 BTU at 19 SEER2. The Rellytech model also delivers 18,000 BTU but at a higher 21 SEER2 efficiency rating. This means they cool the same size space, but the Rellytech does so more efficiently.