Description
MRCOOL Signature Series 42K BTU 3.5 Ton Multi-Position Air Handler
Air Handler ONLY. Professional-grade multi-position air handler for central ducted HVAC systems. Uses eco-friendly R-454B refrigerant. Pairs with Signature Series condensers for complete AHRI-certified systems.
Solution Statement
The MRCOOL Signature Series 42,000 BTU Multi-Position Air Handler (MCAEAMPEF42C21AA) is a professional-grade indoor unit designed for central ducted HVAC systems. This Air Handler ONLY unit uses eco-friendly R-454B refrigerant (lower Global Warming Potential than R-410A) and features a ECM motor for efficient, quiet airflow. The multi-position design supports upflow, downflow, and horizontal installation orientations, providing maximum flexibility for different duct configurations. This air handler must be paired with a compatible MRCOOL Signature Series condenser (AC or heat pump) to create a complete, AHRI-certified central HVAC system. Professional installation by a licensed HVAC technician is required.
Technical Specifications
| Specification | Value |
|---|---|
| Model / SKU | MCAEAMPEF42C21AA |
| Series | Signature Series Multi-Position Air Handler |
| Capacity | 42,000 BTU (3.5 Ton) |
| Motor Type | ECM |
| Refrigerant | R-454B (Low GWP, eco-friendly) |
| Installation Positions | Upflow / Downflow / Horizontal |
| Electrical | 208-230V / 60Hz / 1-Phase |
| Certifications | AHRI Certified, ETL Listed |
| Weight | 144.0 lbs (65.3 kg) |
| Product Type | Air Handler ONLY (condenser sold separately) |
| AHRI Reference | Available upon request |
Product Tips
- This is an Air Handler ONLY — a compatible MRCOOL Signature Series condenser (AC or heat pump) must be purchased separately to complete the system.
- Uses R-454B refrigerant — ensure your HVAC technician is certified for A2L refrigerant handling as required by local codes.
- The multi-position design allows upflow, downflow, or horizontal installation — verify your duct configuration before ordering.
- For electric heat backup, add a compatible Signature Series Heat Kit (MCHK series) to this air handler for emergency or supplemental heat.
- Pair with the MRCOOL Smart Wi-Fi Mini Stat (MSTAT01) for smart home integration and remote temperature control.
Frequently Asked Questions
Our HVAC specialists can verify AHRI compatibility and answer installation questions.
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