MRCOOL DIY 5th Gen 2-Zone 21,000 BTU Ductless Mini Split Air Conditioner & Heat Pump (9K+12K), - DIY2-B-18HP0912
Take control of your comfort with the MRCOOL DIY 5th Gen Multi-Zone Mini Split System - the easiest and most affordable way to get powerful, energy-saving heating and cooling without hiring a pro.
Whether it’s hot summer days or freezing winter nights, the MRCOOL DIY Mini Split keeps your home comfortable and your energy bills low. Smart. Simple. Affordable.
If multiple air handlers are used at the same time, their total BTU output will be limited by the condenser’s capacity. For this system, the condenser can provide up to 18,000 BTU in total.
Features
-
Two Rooms, Perfect Comfort: Heat or cool two spaces up to 350 sq. ft. and 500 sq. ft. each with independent temperature control for personalized comfort.
-
Truly DIY-Friendly: Forget expensive installs - no HVAC license or special tools required. If you can use basic hand tools, you can do this.
-
Year-Round Savings: Boasting up to 23.9 SEER2 cooling efficiency and 10.0 HSPF2-4 heating performance, this system delivers serious energy savings.
-
Built for Every Season: Stay cozy even in the dead of winter - reliable heating works all the way down to -13°F.
What our Experts Think
-
Dual-zone comfort: 21,000 BTU (9K + 12K) capacity allows independent temperature control for two separate spaces.
-
DIY-friendly setup: 5th Gen design simplifies installation, making it easy to set up without professional help.
-
Energy-efficient operation: Provides reliable cooling and heating while minimizing electricity costs.
-
Compact and flexible: Ideal for homes, offices, or spaces without existing ductwork.
-
Trusted MRCOOL engineering: Built for durability, low maintenance, and long-term performance.
Q&A
Q: What is the MRCOOL DIY2-B-18HP0912?
A: A 5th Gen 2-zone ductless mini split with 21,000 BTU capacity (9K + 12K) for heating and cooling.
Q: Can it heat and cool?
A: Yes, it functions as both an air conditioner and heat pump for year-round comfort.
Q: How many zones does it support?
A: Supports 2 indoor units, allowing independent temperature control in two rooms.
Q: Is it DIY-friendly?
A: Yes, designed for easy installation without professional HVAC contractors.
Q: What type of space is it suitable for?
A: Ideal for small to medium homes, apartments, or multi-room setups.
Q: Why choose MRCOOL DIY 5th Gen?
A: Offers flexible multi-zone comfort, energy efficiency, and simple DIY installation.
Maintenance Tips
-
Clean or replace air filters every 1–3 months to maintain airflow and indoor air quality.
-
Keep outdoor condenser units clear of debris, leaves, and dirt to ensure efficient heat exchange.
-
Check refrigerant lines and connections periodically to prevent leaks.
-
Clean evaporator and condenser coils annually to maintain optimal performance.
-
Inspect and clear condensate drain lines to prevent clogs and water damage.
-
Ensure indoor units are unobstructed to maintain proper airflow.
-
Schedule annual professional maintenance to check refrigerant levels, electrical connections, and inverter operation.
-
Use a programmable thermostat to optimize comfort, save energy, and reduce wear on the system.
Damage 
Loss 
Theft 
