Technical Data
Specs, manuals, videos, and product documents
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A smart, reliable choice for year-round comfort.
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Elevate your home comfort with the MRCOOL® Signature Series 36K Stud Mount Air Handler—designed for exceptional flexibility, energy efficiency, and easy installation. Built to fit cleanly between standard wall studs, this slim, space-saving unit is perfect for areas where conventional air handlers aren't practical, offering a smart solution for a variety of installation scenarios. Despite its compact size, the unit delivers strong and reliable heating and cooling performance when paired with a compatible heat pump or condenser. With both front and bottom return air options available, it offers adaptable airflow configurations to suit your layout. Built to last, the MRCOOL® Signature Series 36k Stud Mount Air Handler features a rugged galvanized steel cabinet and advanced blower technology for quiet, consistent operation. Full cabinet insulation helps prevent condensation and energy loss, while the high-efficiency ECM motor ensures balanced airflow and energy savings throughout your space. Maintenance is quick and easy with the integrated filter rack, and optional electric heat kits are available to provide additional comfort during colder months. Backed by a 10-year limited parts warranty, this unit delivers dependable performance and long-term peace of mind. Whether you're upgrading an existing system, starting a renovation, or building from the ground up, the MRCOOL® Signature Series 36K Stud Mount Air Handler is a smart, compact solution that never compromises on comfort.
AHRI certified- meets industry standards.Register your productto activate warranty coverage.This air handler is designed for R-454B refrigerantand must be paired with compatible R-454B condensers or heat pumps. Professional installation is required to ensure proper operation and warranty validation.
| Brand | MRCOOL |
| Series | Signature Series Stud Mount Air Handler |
| Model | MCAEAWPEF36E21AA |
| UPC | 840255595940 |
| GTIN | 00840255595940 |
| Unit Type | Air Handler |
| Configuration | Stud Mount |
| Certifications | UL Listed, CSA Listed, ETL Listed, AHRI Certified |
| Capacity | 36,000 BTU (3 Ton) |
| Electrical | 208/230V 1 Phase 60 Hz |
| Min Circuit Ampacity | 4.5A |
| Max Fuse Breaker | 6A |
| Blower Motor Type | ECM |
| Blower Motor HP | 1/2 |
| Blower Motor Speeds | 5 |
| Blower Motor RPM | 1000 |
| CFM | 1095 |
| Sound Rating | 57 dBA |
| Refrigerant Type | R-454B |
| Liquid Line Size | 3/8" |
| Suction Line Size | 3/4" |
| Drain Connection Size | 3/4" |
| Air Flow Direction | Upflow |
| Filter Type | Replaceable |
| Filter Size | 20" x 20" x 1" |
| Metering Device | Orifice |
| Auxiliary Heater Included | No |
| Auxiliary Heater Available | Yes (5kW, 7.5kW, 10kW) |
| Net Dimensions (HxWxD) | 39.5" x 22.125" x 19" |
| Net Weight | 110 lbs |
| Shipping Dimensions | 42.89" x 24.6" x 22.25" |
| Shipping Weight | 120 lbs |
| Compatible Equipment | Signature Series Top Discharge Condensers |
| Mounting Configuration | Stud mount design for space-saving installation |
| Airflow Options | Front and bottom return air configurations |
| Motor Technology | High-efficiency ECM motor for energy savings |
| Noise Reduction | Quiet operation at 57 dBA |
| Construction | Durable galvanized steel cabinet with full insulation |
| Heating Options | Optional electric heat kits available (5kW, 7.5kW, 10kW) |
| Maintenance | Built-in filter rack for easy filter changes |
PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
The MRCOOL Signature Series 36K Stud Mount Air Handler features advanced ECM motor technology with a powerful 1/2 HP motor that delivers high-capacity 1095 CFM airflow while maintaining energy efficiency. The high-efficiency blower motor offers five-speed operation with 1000 RPM capability, ensuring optimal performance across various system configurations for this 3-ton unit. The durable galvanized steel construction combined with full cabinet insulation reduces energy loss and prevents condensation. Designed specifically for R-454B refrigerant systems, this air handler delivers reliable performance when paired with compatible condensers. With its quiet 57 dBA operation and space-saving stud mount design, this high-capacity unit provides an ideal solution for residential applications requiring maximum performance in limited spaces.
This 3-ton air handler simplifies installation with its unique stud mount design that fits between standard wall studs, making it perfect for retrofits, remodels, and new construction where space is limited. The compact cabinet measures just 19 inches deep, allowing for installation in tight spaces where traditional air handlers won't fit, despite its high 36,000 BTU capacity. The unit offers both front and bottom return air configurations, providing flexibility for various installation scenarios. The built-in filter rack accommodates larger 20x20x1 filters for improved air filtration. Optional electric heat kits (5kW, 7.5kW, 10kW) are available to enhance heating performance during colder months. With its accessible service panels and straightforward connections, the MRCOOL Signature Series Stud Mount Air Handler offers a practical and efficient solution for challenging installation environments requiring maximum capacity performance.
Technical Data
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Product FAQs
MRCOOL products are sold through authorized retailers and distributors rather than directly by MRCOOL to consumers. Purchasing through an authorized seller helps confirm that the equipment is genuine and that the correct purchase records are available for product and warranty support.
Do not assume that MRCOOL indoor units, outdoor units, line sets, controls, or accessories are interchangeable. Use only manufacturer-approved combinations for the exact model family; in particular, MRCOOL states that R-410A products are not compatible with R-454B products and the refrigerants must never be mixed.
Eligible MRCOOL DIY systems are designed around installation-friendly components such as factory-precharged line sets and compatible connection hardware. The included components vary by generation and package, and electrical work, permits, clearances, and local code requirements still need to be followed.
MRCOOL does not dispatch field technicians. Its in-house team provides phone and email assistance for diagnosis, troubleshooting, and product guidance, while the owner arranges and pays for any local on-site technician unless a specific written warranty program states otherwise.
The model and serial number identify the exact equipment, generation, capacity, and applicable documentation or warranty. Use the identification labels on the equipment and MRCOOL’s registration guidance rather than relying only on a product title or general series name.
No. Only product families specifically identified by MRCOOL as DIY-capable should be treated as do-it-yourself systems. Other lines, including the Advantage Series, require professional HVAC installation, so always follow the installation requirements for the exact model.
MRCOOL maintains a documentation library and a product support center with model-specific installation manuals, owner manuals, technical documents, certifications, warranty information, and troubleshooting resources. Search using the exact model number because documents can differ by series, generation, capacity, and refrigerant.
MRCOOL offers a broad range of comfort products, including ductless mini-splits, central ducted split systems, packaged heat pumps, geothermal systems, water heaters, fans, thermostats, line sets, and HVAC accessories. Available capacities, refrigerants, efficiencies, and features depend on the exact product family and model.
Register the system as soon as possible after purchase and installation. Several MRCOOL residential warranty programs require registration within 60 days of installation, or within 60 days of purchase when the installation date cannot be verified, but the exact requirement is controlled by the warranty document for the specific product.
MRCOOL recommends starting with the original place of purchase because many dealers can special-order replacement parts. If that is not available, use an authorized MRCOOL parts distributor and confirm compatibility with the exact model and serial number before ordering.
MRCOOL provides support by phone at (270) 366-0457, by email at support@mrcool.com, and through its online support-request form. Have the exact model and serial number available so the support team can identify the correct product documentation and next steps.
Yes. If a local technician is scheduled, MRCOOL’s in-house support team can help coordinate troubleshooting and product guidance with that technician. The technician should have the model, serial number, system configuration, measurements, error codes, and a clear description of the issue available.
MRCOOL’s support center provides separate technical-support sections for ductless systems, residential ducted systems, product-specific error codes, wiring guidance, installation procedures, and troubleshooting articles. Use the exact series and model because codes and procedures are not universal across all MRCOOL equipment.
Register the product through MRCOOL’s online warranty-registration page. Be prepared to provide the serial number along with purchase, owner, installation-location, and installer information requested by the registration form.
No. MRCOOL publishes separate warranty terms for different product families, generations, and applications. For example, the current DIY 5th Generation warranty lists 5-year parts and 7-year compressor coverage, but that coverage should not be assumed for another MRCOOL series; always check the exact product warranty document.