MRCOOL DIY 5th Gen 3-Zone 39,000 BTU Ductless Mini Split Air Conditioner & Heat Pump (9K+12K+18K), - DIY3-B-36HP
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 36,000 BTU in total.
Features
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Three Rooms, Perfect Comfort: Heat or cool three spaces that are 350 sq. ft., 500 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 23 SEER2 cooling efficiency and 9.9 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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Customized Multi‑Zone Comfort – 39,000 BTU heat pump system with three zones (9K + 12K + 18K) delivers tailored cooling and heating for varied living spaces.
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DIY‑Friendly Installation – Designed with intuitive connections and pre‑configured features to streamline setup for experienced DIYers and professionals.
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Inverter Efficiency – Variable‑speed compressor adapts output to demand, boosting energy efficiency and steady comfort control.
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All‑Season Performance – Heat pump design ensures reliable heating and cooling throughout the year.
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Quiet & Balanced Operation – Engineered for low‑noise performance and even temperature distribution across all zones.
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Eco‑Conscious Design – Uses modern refrigerant systems that align with current efficiency standards.
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Built to Last – Quality components and solid construction support long‑term reliability and satisfaction.
Q&A
Q: What is the MRCOOL DIY3‑B‑36HP?
A: A 39,000 BTU (3.25 ton) 5th Gen DIY ductless mini split heat pump system with three indoor zones (9 K + 12 K + 18 K) for efficient multi‑room cooling and heating.
Q: What refrigerant does it use?
A: Uses R‑454B refrigerant for lower environmental impact and improved energy efficiency.
Q: How efficient is the system?
A: Advanced inverter technology delivers strong SEER‑rated cooling and heating performance with optimized energy use and lower operating costs.
Q: Is installation DIY‑friendly?
A: Yes — includes pre‑charged Quick Connect line sets that eliminate refrigerant handling and reduce the need for extensive HVAC tools, supporting easier DIY installation.
Q: What comfort features are included?
A: Quiet inverter operation and zone‑by‑zone temperature control allow personalized comfort in each connected space.
Q: What warranty coverage does it include?
A: Typically backed by long‑term compressor and parts warranty for peace of mind.
Q: Who should choose this system?
A: Homeowners seeking a high‑efficiency, multi‑zone climate solution with flexible comfort control and simplified installation.
Maintenance Tips
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Clean/replace indoor filters monthly in all zones to keep airflow strong and efficiency high.
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Deep‑clean indoor coils twice a year to maintain cooling/heating performance.
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Check and clear condensate drains regularly to prevent clogs and moisture issues.
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Keep indoor units and outdoor condenser free of dust/debris for proper airflow and heat exchange.
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Inspect outdoor unit fins and fan periodically; gently clean and straighten fins as needed.
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Watch for unusual noises, weak airflow, or odors and address issues promptly.
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Schedule annual professional maintenance for refrigerant balance, inverter performance, and electrical checks.
