MRCOOL® 36,000 BTU DIY Hybrid™ Ducted Air Handler. Multi-zone compatible, R-454B refrigerant — DIY-36-HP-MUAH-230D25-O

Product Description 

Short Description 

MRCOOL DIY-36-HP-MUAH-230D25-O — 36,000 BTU DIY Hybrid™ Ducted Air Handler Multi-zone compatible, R-454B refrigerant, Wi-Fi thermostat included, and multi-position installation for full home comfort up to 1,550 sq. ft.

Long Description 

The MRCOOL® DIY™ Hybrid 36K Ducted Air Handler (DIY-36-HP-MUAH-230D25-O) delivers powerful, energy-efficient whole-home comfort with true DIY installation—no EPA certification, vacuum pump, or specialized HVAC tools required. Designed for compatibility with MRCOOL DIY condensers, this 3-ton air handler provides reliable year-round heating and cooling for spaces up to 1,550 sq. ft., making it an ideal replacement for outdated central units or an upgrade for new construction.

Engineered for performance, this Hybrid unit uses R-454B refrigerant, delivering high efficiency while reducing environmental impact. The rugged, painted galvanized steel cabinet is built for durability and quiet operation. Inside, an advanced Electronic Expansion Valve (EEV) ensures precise refrigerant metering for optimal efficiency and climate control.

Homeowners love the flexible multi-position configuration—install it upflow, downflow, or horizontal left/right to fit almost any mechanical room or crawlspace layout. A built-in self-diagnostic panel simplifies service by displaying real-time error codes, while the replaceable filter system keeps air quality high and maintenance low.

Comfort extends beyond hardware. This unit includes the MRCOOL Smart Wi-Fi Thermostat, allowing full control via touchscreen or the MRCOOL app. Adjust temperature, humidity, fan speeds, and modes from anywhere using iOS or Android—perfect for everyday living or remote property management.

For colder climates, optional auxiliary heat kits (5kW–20kW) provide instant supplemental heat without replacing your air handler. The AHRI-certified design ensures verified performance, and the 5-year parts warranty delivers total peace of mind.

Upgrade to modern efficiency, year-round performance, and DIY freedom with the MRCOOL® DIY Hybrid™ 36K Air Handler—the smartest way to heat and cool your home.

Core Features 

• 36,000 BTU (3-Ton) heating & cooling capacity
• Works with MRCOOL DIY condensers & Multi-Zone
• Ultra-quiet operation: 31–48 dBA
• Up to 1,550 sq. ft. coverage
• Max lineset length: 246 ft
• EEV metering device — precise performance
• AHRI, UL, CSA, ETL certified
• Central Ducted Comfort

• Even airflow through existing or new ducts—no wall units required.
• DIY-Ready Communication
  Pairs seamlessly with MRCOOL® DIY condensers via control wiring.
• Emergency Heat Ready
  Supports optional heat strips (5kW to 20kW heat kit) for winter backup or extreme cold.
• Smart Controls Included
  Works with the MRCOOL® Smart Wi-Fi Thermostat — touchscreen and mobile app.
• Self-Diagnostics Panel
  Onboard error code panel speeds troubleshooting and reduces downtime.
• Flexible Orientation
  Install upflow, downflow, or horizontal (left/right)—ideal for basements, closets, crawlspaces, attics, and utility rooms.
• R-454B Refrigerant
  The next-generation refrigerant with higher performance and reduced environmental impact vs R410A.
• Rugged Cabinet
  Painted galvanized steel designed for long service life and real-world installations.
• Real Warranty
  5-Year Parts Warranty — backed by MRCOOL, not a reseller gimmick.
• USA Nationwide Shipping
  In-stock and delivered fast from MRCOOLDirect.com.

 

Works with (Sold Separately)

DIY-MULTI4-27HP230D-O  MRCOOL® 27k DIY 5th Generation 4 Zone Multi-Zone Mini-Split Condenser 230v

DIY-MULTI5-36HP230D-O  MRCOOL® 36k DIY 5th Generation 5 Zone Multi-Zone Mini-Split Condenser 230v

DIY-MULTI5-36HP230D-O  MRCOOL® 36k DIY 5th Generation 5 Zone Multi-Zone Mini-Split Condenser 230v

DIY-MULTI6-48HP230D-O  MRCOOL® 48k DIY 5th Generation 6 Zone Multi-Zone Mini-Split Condenser 230v

DIY-MULTI6-55HP230D-O  MRCOOL® 55k DIY 5th Generation 6 Zone Multi-Zone Mini-Split Condenser 230v

DIY-36-HP-C-230D25-O  MRCOOL® 36k DIY 5th Generation Mini-Split Condenser 230v

What Heat Kits fit (Sold Separately)  

MVPHK05 5kW. VersaPro, Hyper Heat 2nd Gen 454B  and DIY Hybrid Air Handler Heat Kit

MVPHK08  VersaPro, Hyper Heat 2nd Gen 454B  and DIY Hybrid Air Handler Heat Kit

MVPHK10  VersaPro, Hyper Heat 2nd Gen 454B  and DIY Hybrid Air Handler Heat Kit

MVPHK15  VersaPro, Hyper Heat 2nd Gen 454B  and DIY Hybrid Air Handler Heat Kit

MVPHK20  VersaPro, Hyper Heat 2nd Gen 454B  and DIY Hybrid Air Handler Heat Kit

Tech Specs

Model: DIY-36-HP-MUAH-230D25-O

Series: DIY Hybrid™ Air Handler

Unit Type: Split System Ducted Air Handler

Voltage: 208/230V (Single Phase, 60Hz)

Cooling Capacity: 36,000 BTU

Heating Capacity: 37,000 BTU

CFM: 1189 / 1083 / 971 / 865

Noise Level: 31–48 dBA

Refrigerant: R-454B

Number of Fan Speeds: 4

Drain Connection: 3/4”

Liquid Line: 3/8”

Suction Line: 5/8”

Max Lineset Length: 246 ft

Aux Heat Kit Support: 5kW / 8kW / 10kW / 15kW / 20kW

Net Dimensions: 49.02 × 21.02 × 21.02 in

Net Weight: 128.31 lb

Cabinet Material: Painted galvanized steel

Wi-Fi Compatible: Yes (iOS + Android)

 

Available Capacities

• 24K (24,000 BTU) — up to ~1,000 sq. ft. DIY-24-HP-MUAH-230D25-O
• 36K (36,000 BTU) — up to ~1,500 sq. ft.  DIY-36-HP-MUAH-230D25-O

Quick Sizing Rules

• Choose 24K (~1,000 sq. ft.) or 36K (~1,500 sq. ft.) for the ducted zone.
• Add the BTUs of any additional indoor heads.
• Select a DIY condenser that matches or slightly exceeds total capacity.

Coverage varies based on insulation, climate, ceiling height, windows, duct design, and occupancy.

For multi-zone configurations, always sum total BTUs (ducted + mini split indoor units) to size the condenser.

Popular Add-Ons

• Heat Kit (Emergency Heat Strips) — 5kW to 20kW
• Additional MRCOOL® indoor handlers (wall / ceiling / ducted)
• MRCOOL® DIY outdoor condenser sized to total BTUs
• Plenums, returns, ducting, supply registers, and filters

 Ideal Applications

• Whole-home replacement of old HVAC systems
• New construction or remodels
• Garages, workshops, basements, attics
• Manufactured or modular homes
• Rental properties, lake houses, Airbnb
• Heat pump upgrades with no gas furnace needed

 

DIY-Friendly Installation Overview

1. Choose orientation: upflow, downflow, or horizontal.
2. Mount the air handler, connect supply and return ducts.
3. Connect control wiring to the compatible MRCOOL® DIY condenser.
4. Install the Smart Wi-Fi thermostat and sync with the MRCOOL® app.
5. Run diagnostics using the onboard error display to verify operation.

Follow the official MRCOOL® installation manual and local electrical codes.

Professional help may be required for ductwork, electrical, or code compliance.

 Warranty

• Base Parts Warranty: 5 Years
• Extended Limited Lifetime: Available upon registration

 

Why Buy From Your Store  

Shipping & Warranty

• Fast Nationwide Shipping from MRCOOLDirect.com — America’s leading DIY HVAC supplier.
• Warranty: 5-Year Parts Warranty backed by MRCOOL.
• Authorized Dealer: Authentic MRCOOL® products — no knockoffs or refurbished units.

 

Why Homeowners Choose the MRCOOL® DIY Hybrid™ System

The Hybrid air handler is the bridge between old-school central HVAC and modern multi-zone mini splits.

Replace your outdated furnace or air handler with a ducted MRCOOL® system, then expand room-by-room with additional indoor units—all powered by one outdoor condenser.

It’s energy-smart, scalable, and ideal for whole-home comfort without contractor markup or complicated installs.

 

Frequently Asked Questions

Can I use this air handler with a MRCOOL® DIY condenser?

Absolutely. The DIY Hybrid™ Ducted Air Handler is built to communicate through control wire and pair directly with compatible MRCOOL® DIY condensers, delivering a true DIY installation with full factory support.

How do I size the outdoor condenser?

Treat the system like a multi-zone mini split.

Add the BTUs of the ducted air handler PLUS any other indoor heads.

Choose a condenser that meets or slightly exceeds that total capacity.

What areas do the 24k and 36k units typically handle?

• 24K (24,000 BTU) — up to ~1,000 sq. ft.
• 36K (36,000 BTU) — up to ~1,500 sq. ft.
  Coverage changes with insulation, climate, windows, ceiling height, and room layout.

Does it support emergency heat?

Yes. You can install an optional heat kit (heat strips) to provide auxiliary heat in colder months or extreme temperature swings.

Which refrigerant does it use?

This air handler uses R-454B, a next-generation refrigerant engineered for high efficiency and reduced environmental impact compared to older refrigerants like R410A.