MRCOOL DIY 4th Gen 12K BTU Mini-Split Heat Pump System – Rare R-410A Model, 22 SEER, DIY Installation

Compact. Efficient. Hard to Find.

The MRCOOL DIY 4th Generation 12K BTU, 1 Ton, 22 SEER Ductless Mini-Split Heat Pump System (DIY-12-HP-WM-115C25) is the most popular size for bedrooms, offices, and small living spaces. This R-410A 4th Gen unit is no longer manufactured but remains one of the most sought-after systems due to its proven reliability, DIY installation, and high efficiency.

Designed to heat and cool up to 500 sq. ft., this system is ideal for single rooms, apartments, garages, or additions where comfort and efficiency matter most. With its pre-charged quick-connect line set, you can install it yourself—no HVAC tech required.

🌟 Key Features & Benefits

✔ Rare R-410A DIY System – Small but Powerful

• Compact size makes it the most versatile 4th Gen model.

• Discontinued nationwide, but in high demand for small spaces.

✔ High Efficiency, Energy Savings

• 22 SEER rating exceeds Energy Star standards.

• Inverter-driven technology reduces utility bills without sacrificing comfort.

✔ Complete DIY Package – What’s Included

• 12K BTU Outdoor Condenser Unit

• 12K BTU Indoor Wall-Mounted Air Handler

• 25 ft. Pre-Charged Line Set with R-410A Refrigerant

• Smart Remote Control with Follow Me Function

• Communication Cable, Wall Bracket, and Install Kit

✔ Simple DIY Installation

• Pre-charged quick-connect line set → no special tools or license required.

• Step-by-step guides and videos included.

✔ Comfort Modes for Every Season

• Cooling, Heating, Dehumidification, Auto, and Sleep Modes.

• Whisper-quiet operation perfect for bedrooms or offices.

✔ Smart Home Ready

• WiFi app control from your phone.

• Works with Alexa & Google Assistant.

• “Follow Me” feature adjusts temperature based on remote location.

✔ Warranty You Can Trust

• Limited Lifetime Compressor Warranty.

• 5-Year Parts and 7-Year Compressor Protection.

📦 Why Choose the 12K 4th Gen MRCOOL?

• ✅ Rare availability – one of the last R-410A DIY 12K systems.

• ✅ Perfect for small spaces up to 500 sq. ft.

• ✅ 22 SEER efficiency saves money on energy bills.

• ✅ Smart-ready with WiFi + voice assistant compatibility.

• ✅ DIY install saves hundreds on labor.

• ✅ Backed by warranty for long-term reliability.

🛒 Limited Stock – Order Now

This is one of the last chances to buy a brand new MRCOOL DIY 4th Gen 12K BTU system. Discontinued but still in demand, these units will not be restocked once sold out.

👉 Order today from MRCOOL DIY Direct – America’s most trusted MRCOOL dealer.