MRCOOL DIY 5th Gen 3-Zone 36,000 BTU Ductless Mini Split Air Conditioner & Heat Pump (9K+9K+18K), - DIY3-B-48HP
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.
Features
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Three Rooms, Perfect Comfort: Heat or cool three spaces that are 350 sq. ft., 350 sq. ft. and 750 sq. ft. each with independent temperature control for personalized comfort.
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Truly DIY-Friendly: Forget expensive installs - no HVAC license or special tools required. If you can use basic hand tools, you can do this.
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No Hassle Setup: Comes with pre-charged Quick-Connect line sets, so there’s no messy refrigerant handling or vacuuming. Just connect and enjoy.
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Year-Round Savings: Boasting up to 21.8 SEER2 cooling efficiency and 10 HSPF2-4 heating performance, this system delivers serious energy savings.
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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
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Tailored Multi‑Zone Comfort – 36,000 BTU system configured for three zones (9K + 9K + 18K) delivers customized cooling and heating for multiple rooms.
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DIY‑Friendly Setup – Designed for straightforward installation with intuitive connections for experienced DIYers and professionals.
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Inverter Efficiency – Variable‑speed compressor adjusts output to match demand, improving energy efficiency and comfort control.
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All‑Season Performance – Heat pump capability ensures dependable heating and cooling throughout the year.
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Quiet, Balanced Operation – Engineered for low noise levels and consistent temperature distribution across all zones.
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Modern Eco‑Conscious Design – Uses refrigerant systems aligned with current efficiency and environmental performance expectations.
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Durable Reliability – Built with quality components for long‑lasting performance and customer satisfaction.
Q&A
Q: What is the MRCOOL DIY3‑B‑48HP?
A: A 36,000 BTU (3 ton) 5th Gen DIY ductless mini split heat pump system with three indoor zones (9K + 9K + 18K) for zoned cooling and heating.
Q: What refrigerant does it use?
A: Uses R‑454B refrigerant for lower environmental impact and improved efficiency.
Q: How efficient is the system?
A: High‑efficiency inverter technology delivers strong cooling and heating performance with reduced energy costs.
Q: Is installation DIY friendly?
A: Yes — includes pre‑charged Quick Connect line sets that eliminate refrigerant handling and most vacuuming, making installation possible with basic tools.
Maintenance Tips
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Clean or replace indoor filters monthly in all three zones to maintain airflow, comfort, and energy efficiency.
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Deep‑clean indoor coils twice a year to optimize cooling and heating performance.
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Check and clear condensate drain lines regularly to prevent clogs, leaks, and mold buildup.
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Keep indoor units and outdoor condenser free of dust and debris to support proper airflow and heat exchange.
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Inspect outdoor unit fins and fan periodically; gently clean and straighten fins as needed to maintain efficiency.
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Watch for unusual noises, unusual odors, or reduced airflow and address issues promptly.
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Schedule annual professional maintenance to check refrigerant balance, inverter operation, and electrical connections.
