MRCOOL DIY 5th Gen Mini Split - 4-Zone 48,000 BTU Ductless Air Conditioner and Heat Pump Condenser with 12K + 9K + 9K + 6K Ceiling Cassette Air Handlers - DIY5-4ZC-48HP-12K9K9K6K
Take control of your home’s comfort with the MRCOOL® 5th Gen DIY® Multi-Zone Mini Split System — the ultimate solution for efficient, customizable, and true DIY-friendly heating and cooling.
This powerful 48K 4-Zone system includes one 12K, two 9K and one 6K ceiling cassette air handlers.
Features
-
Customize mini-split system: choose the perfect line set length for each zone just above the “Add to Cart” button.
-
Ultra-Efficient Cooling & Heating: Enjoy up to 21.8 SEER2 and 10 HSPF2-4 for energy-efficient year-round comfort.
-
Low-Profile Ceiling Cassette Design: Flush-mounted unit fits between standard ceiling joists for a clean, built-in look.
-
DIY-Friendly QuickConnect® Installation: No vacuuming or professional tools needed — pre-charged line sets make setup fast and simple.
-
Smart Voice & App Control: Full control via SmartHVAC app, Alexa, Google Assistant, or included wireless remote.
-
Eco-Conscious Refrigerant: Uses R-454B refrigerant with a low environmental impact.
-
Industry-Leading Warranty: Includes 5-year parts, 7-year compressor, and lifetime replacement with MRCOOL® Care registration.
What our Experts Think
-
Multi-Zone Climate Control
The MRCOOL DIY 5th Gen Mini Split 48,000 BTU system provides four-zone cooling and heating with ceiling cassette air handlers (18K, 12K, 12K, 6K), allowing precise temperature management throughout the home.
-
High Energy Efficiency
With a 21.8 SEER2 rating, it delivers significant energy savings and lower utility costs.
-
DIY-Friendly Installation
Quick Connect™ fittings and pre-charged line sets make installation straightforward, even without professional help.
-
Smart Home Compatibility
Works with the MRCOOL Smart HVAC Controller, enabling remote control via smartphone for convenience and automation.
-
Complete All-In-One System
Includes the outdoor condenser, four indoor cassette units, wireless remotes, line sets, and smart controller for a turnkey solution.
Q&A
Q: What is the MRCOOL DIY 4-Zone Mini Split used for?
A: It is a ductless air conditioner and heat pump system that provides both cooling and heating for up to four separate zones in a home or office.
Q: What is the total cooling capacity?
A: The system delivers 48,000 BTU of total cooling capacity, distributed across four indoor air handlers: 18K + 12K + 12K + 6K BTU.
Q: How are the indoor units configured?
A: Includes ceiling cassette air handlers for each zone, offering quiet, efficient airflow and customizable comfort.
Q: Can this system heat as well as cool?
A: Yes — it is a heat pump system capable of providing efficient heating during colder months.
Q: Is professional installation required?
A: No — the MRCOOL DIY 5th Gen series is designed for easy do-it-yourself installation with pre-charged lines and minimal tools required.
Q: How many zones can be controlled individually?
A: Each of the four zones can be controlled independently for customized comfort and energy savings.
Q: What makes this system energy-efficient?
A: It features inverter technology, multi-zone control, and energy-saving operation to reduce electricity usage while maintaining optimal comfort.
Maintenance Tips
-
Clean or replace air filters in all indoor units every 2–4 weeks to maintain airflow and efficiency.
-
Wipe down the indoor and outdoor unit surfaces regularly to prevent dust buildup.
-
Inspect and clear condensate drains to prevent clogs and water damage.
-
Check refrigerant lines and electrical connections periodically for leaks or wear.
-
Schedule professional servicing annually to ensure optimal cooling, heating performance, and system longevity.
