MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v
Component — Not a Complete System
This is the outdoor unit only. To run, you also need a matching indoor air handler and a refrigerant line set. Looking for the complete system instead? Browse complete 18,000 BTU systems.
SKU DIY-18-HP-C-230D25-O
With Incentives
Save up to $1,18722.5 SEER2 meets CEE Tier 2 (≥16). Find your state's rebate
Customize it — compatible add-ons only
Same capacity, generation, and voltage — the only units this condenser runs.
Only needed when the run from condenser to indoor unit is longer.
Lifts the condenser above snow, mud, and runoff.
Joins two line sets end-to-end for extra-long runs — MrCool's official method.
Clean channel for the lines running down your exterior wall.
MrCool DIY factory warranty — register after install to activate the full coverage tiers.
Sizing Help
Not sure if 18K BTU is right for your space?
Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.
Resources
Brochures & Manuals
Description
MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v
What's in the Box
Here's what you'll receive with your order
Outdoor Condenser Unit
Heat pump condenser with Gold Fin anti-corrosion coating
Installation Hardware
Mounting brackets and hardware kit
Owner Manual
Installation and operation guide
Key Specifications
22.5
SEER2 Rating
18000BTU
Cooling Capacity
208/230V
Voltage
58.5dBA
Noise Level
1
Zone Capacity
MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Room & Space Coverage — 18,000 BTU
The MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v delivers 18,000 BTU of cooling and heating capacity (1.5-ton class), sized for spaces up to 900 sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit handles medium primary rooms, master suites with attached bath, converted garages, and workshops. If your space includes a sunny west-facing wall or a finished bonus room above it, lean toward the upper end of the coverage range.
Efficiency & Operating Cost
This unit is rated at 22.5 SEER2 and 13.7 EER2 at full load. SEER2 measures seasonal cooling efficiency — higher is better — and 22.5 puts this in the premium efficiency tier. For heating performance it carries a 11.5 HSPF2 rating, which translates to roughly 300–350% heating efficiency versus resistance electric — one kilowatt-hour of electricity moves three kWh of heat into the space at mild outdoor temperatures. Running the unit 8 hours a day at full load draws roughly 192 kWh/month — about $31/month at the US average $0.16/kWh residential rate. Real-world draw is usually 30–50% lower because inverter compressors modulate down most of the time. ENERGY STAR certification makes this SKU eligible for federal tax credits (25C in 2026, up to 30% / $2,000 for qualifying heat pumps) and most state/utility rebate programs — check your state page for specific amounts.
Power & Electrical Requirements
Power requirement: 208/230V 1-phase 60Hz (standard US residential 240V service). Minimum circuit ampacity is 18A with a maximum overcurrent protection of 20A. Wire the outdoor unit with 12 AWG copper on a dedicated 20A double-pole breaker (or single-pole at 120V), with a disconnect within sight of the condenser per NEC 440.14.
Install Difficulty — DIY-Friendly
This DIY 5th gen Single-Zone Mini-splits system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system. The system supports line set lengths up to 98.4ft; longer runs are available as accessory kits. Plan the shortest practical route — every 10ft of line set adds roughly 2% capacity loss. Ships with R-454B refrigerant. R-454B is the EPA 2025-compliant low-GWP replacement for R-410A, required for new-manufacture equipment — lower global-warming footprint without an efficiency penalty.
Sound Level & Comfort Features
Rated sound output is 58.5 dB(A) at full operation. Quiet mode caps fan speed and compressor rpm for an extra 2–3 dB drop in sound output.
Warranty & Certifications
Manufacturer warranty: 5 on parts, 7 on the compressor. AHRI certified and UL/ETL listed for North American electrical safety — required for most utility rebate and tax credit programs.
Product Details
Introducing the new 5th Generation MRCOOL® DIY® 18K BTU 22.5 SEER Ductless Heat Pump Single Zone Mini Split Condenser, a game-changer for home climate control. Designed for straightforward installation, it requires no specialized tools or professional help, making it an excellent choice for spaces ranging from 500-750 sq. ft. The system includes a pre-charged 25-foot QuickConnect® line set filled with R-454B refrigerant, streamlining installation by eliminating the need for vacuuming. The DIYPRO® cable adds extra protection against weather, animals, and yardwork damage, replacing the need for traditional electrical conduit. Managing your home's temperature has never been easier. You can adjust settings using the included remote, the SmartHVAC app for Apple and Android devices, or voice commands via Amazon Alexa and Google Assistant. The Gold Fin Condenser enhances durability, providing excellent corrosion resistance for coastal environments. Designed for efficiency and comfort, this system offers multiple features. The Timer function helps control energy use, while Auto mode maintains your preferred temperature without manual adjustments. After a power outage, the unit automatically restores previous settings, and the anti-mildew function prevents excess moisture buildup inside the air handler. Built for long-term reliability, the 5th Generation MRCOOL® DIY® Mini Split comes with an industry-leading warranty, featuring a limited lifetime warranty, plus 7 years on the compressor and 5 years on parts. With its innovative design, simple installation, and dependable performance, this system delivers hassle-free comfort for your home.
Specifications
| Cooling Capacity | 18,000 BTU |
| Heating Capacity | 18,000 BTU |
| SEER2 Rating | 22.5 |
| HSPF2 | 11.5 |
| Voltage | 208/230 V |
| Refrigerant | R-454B |
| Noise Level | 58.5 dBA |
| Zone Capacity | 1 zones |
| Max Line Set | 98.4 ft |
| EER2 | 13.7 |
| Tonnage | 1.5 Ton |
| Phase | 1 |
| Refrigerant Type | R-454B |
| Refrigerant Charge | 44.8 oz |
| Liquid Line Size | 1/4 |
| Suction Line Size | 1/2 |
Features
- Intertek listed 5031495
- Easy DIY installation
- Future-proof your investment with the included DIYPro® cable, eliminating the need for electrical conduit.
- Keep the included remote close by, and MRCOOL DIY®'s Follow Me® function will track the air temperature around you to ensure maximum comfort.
- The MRCOOL® Smart HVAC Controller® Module and App fully support Google Assistant & Amazon Alexa out of the box.
Frequently Asked Questions
Everything you need to know about this product
What size room will the MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v cool?
Can I install this myself without an HVAC license?
Is this unit eligible for the federal 25C tax credit?
What electrical circuit do I need for installation?
How fast does HVACZAR ship this unit?
What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v?
How long does shipping take?
What size room does 18,000 BTU cover?
What is the efficiency rating?
Do you offer returns?
How can I pay?
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Ships Nationwide — Shop by State
We deliver the MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.