Rellytech 12000 BTU Mini Split Review: Budget 115V Heat Pump
Rellytech's low-cost 1 ton mini split cools and heats rooms up to 750 sq ft on 115V, with 12,500 BTU of heat, 19 SEER2 and HSPF2 8.5, ECO mode and 4 fan speeds.
By Daniel Brooks
Updated October 19, 2026
The Rellytech 12000 BTU mini split is one of the least expensive 1 ton heat pumps on Amazon. It runs on 115 volts, delivers 12,000 BTU of cooling and 12,500 BTU of heating, and Rellytech rates it for rooms up to 750 square feet. It lists 19 SEER2 and HSPF2 8.5, respectable numbers for the price. In our single-zone mini-split air conditioners category, it has a 4.4 out of 5 average from 385 ratings shared across the Rellytech series.
Our Verdict
If the goal is to cool and heat one room for as little money as possible, the Rellytech 12000 BTU is a strong candidate. It has four modes, ECO mode, four fan speeds, a 90 degree vertical swing, sleep mode, a 24 hour timer and an LED-off function for dark bedrooms. It is ETL and AHRI certified, and the package includes the indoor unit, outdoor unit and an installation kit.
The compromises are in the details. There is no Wi-Fi, the outdoor unit’s published operating range starts at 19F, which limits winter heating, and the included connecting pipes are 9.84 ft long, shorter than the line sets many rivals include. Rellytech also requires professional HVAC installation.
Rellytech 12000 BTU Mini Split AC/Heating System
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | Rellytech |
| Model | CE0-1 |
| Type | Single-zone ductless mini split heat pump |
| Cooling Capacity | 12,000 BTU |
| Heating Capacity | 12,500 BTU |
| Room Size | Up to 750 sq ft |
| Power | 115V/110V |
| Rated Wattage | 1100 watts |
| Efficiency | 19 SEER2, HSPF2 8.5 |
| Outdoor Operating Range | 19F to 122F |
| Temperature Settings | 61F to 88F |
| Noise Level | 42 dB (feature list); 26 dB (specifications) |
| Refrigerant | R-32 |
| Included Lines | 2 connecting pipes, 9.84 ft |
| Cables | 12.5 ft communication cable, 5.9 ft power cable |
Cooling Capacity and Room Size
Rellytech rates the 12,000 BTU model for up to 750 square feet, and lists bedrooms, living rooms, offices and garages as good fits. On the ENERGY STAR chart below, 12,000 BTU covers 450 to 550 square feet, so expect the best results in that range, or in a larger room that is well shaded and insulated.
ENERGY STAR publishes this general guide for matching cooling capacity to 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 |
| 1,000 to 1,200 | 21,000 |
| 1,200 to 1,400 | 23,000 |
| 1,400 to 1,500 | 24,000 |
| 1,500 to 2,000 | 30,000 |
| 2,000 to 2,500 | 34,000 |
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.
Heating Performance
The heat pump delivers 12,500 BTU of heating, slightly more than its cooling rating. Rellytech publishes an outdoor operating range of 19F to 122F, and notes that the system may reduce output outside that range to protect the compressor. That is fine for mild winters, but it means the Rellytech is less suited to cold regions than systems rated to 5F or below. In a cold climate, use it for cooling and shoulder-season heat, and keep another heat source for winter.
Efficiency
The 19 SEER2 and HSPF2 8.5 ratings put the Rellytech well ahead of window and portable units, and in line with many mid-priced mini splits. ECO mode optimizes energy use in both cooling and heating, and the inverter compressor slows down once the room reaches the set point. The rated draw is 1100 watts.
Controls and Airflow
The remote covers cooling, heating, fan and dry modes with temperatures from 61 to 88F. You get four fan speeds (high, medium, low and auto), a 90 degree vertical swing to direct air where you need it, sleep mode that gradually adjusts the temperature overnight, a 24 hour timer and an LED-off function. There is no app or voice control.
Noise
The listing gives two figures: 42 dB in the feature list and 26 dB in the specifications. The lower number likely reflects the quietest fan setting. Either way, the indoor unit is far quieter than a window AC, and sleep mode keeps it calm at night.
What Is in the Box
The package includes the indoor unit, the outdoor unit, a remote with batteries, a user manual, a bracket template and mounting plate, a 12.5 ft communication cable, a 5.9 ft power cable, 2 connecting pipes of 9.84 ft, a 6.56 ft drain pipe, putty, a pipe protection ring, screws and anchors. The shorter line length means the outdoor unit needs to sit close to the indoor unit, usually directly behind it on the other side of the wall.
Installation
Rellytech requires professional HVAC installation. The system is pre-charged, but the installer still needs to handle the refrigerant connections, vacuum and wall mounting. The indoor and outdoor units may ship separately, so wait until both arrive before scheduling the work.
Warranty and Support
The feature list mentions an 8-year warranty and 24-hour customer service, while the product specifications list 1 year. Confirm the terms with Rellytech and keep proof of professional installation.
Planning the Install
The short 9.84 ft connecting pipes are the main thing to plan around. The simplest layout puts the indoor unit on an outside wall and the outdoor unit directly behind it, so the lines pass straight through. If you need a longer run, your installer will have to supply a longer line set and may need to add refrigerant, which raises the installed cost. Pick an outdoor spot that is level, drains well and stays clear of dryer vents and heavy plants, and plan a dedicated 115V circuit.
Living With It
Run the system on auto or cool and let the inverter hold a steady set point, since big temperature swings waste energy. ECO mode is a good default in mild weather. Use dry mode on humid spring days when the room is not hot but feels damp. In winter, keep an eye on the forecast: when nights drop well below 19F, expect the system to reduce output to protect the compressor.
Pros and Cons
| Pros | Cons |
|---|---|
| Very low price for 1 ton | No Wi-Fi or voice control |
| 12,500 BTU of heat | Outdoor range starts at 19F |
| 19 SEER2 and HSPF2 8.5 | Short 9.84 ft connecting pipes |
| 4 fan speeds and LED-off | Professional install required |
| ETL and AHRI certified | Warranty terms vary by source |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Budget buyers in mild climates | Cold-climate homes |
| Bedrooms, offices and garages | Smart home users |
| Installs with a short line run | Installs with a long line run |
| Homes on a 115V circuit | DIY installers |
For more options, see our picks for the best budget mini-split air conditioners and the best 12,000 BTU mini-split air conditioners.
Final Verdict
The Rellytech 12000 BTU mini split is a capable, efficient heat pump at a very low price, best suited to mild climates and installs where the outdoor unit can sit close to the wall. You can check the current price and details for the Rellytech 12000 BTU Mini Split AC/Heating System.
Frequently Asked Questions
How much heat does the Rellytech 12000 BTU mini split produce?
It lists 12,500 BTU of heating capacity.
What is the outdoor operating range?
Rellytech lists 19F to 122F for the outdoor unit.
Does it have Wi-Fi?
No. It is controlled with the included remote.
How long are the included lines?
The kit includes 2 connecting pipes of 9.84 ft and a 12.5 ft communication cable.
Is the Rellytech 12000 BTU mini split a DIY system?
No. Rellytech requires professional HVAC installation.
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.