MCAEAMPEF42C21AA
NON DIY - Licensed HVAC Installation
Description
The MRCOOL® Signature Series 42k Multi-Position Air Handler is built to provide consistent, energy-efficient comfort in any climate. Designed for flexibility and performance, this unit works with R-454B refrigerant, a low-GWP alternative that helps reduce environmental impact without sacrificing power or reliability. Its multi-position design allows for installation in upflow, downflow, or horizontal configurations, making it ideal for a variety of home layouts, from new construction to tight retrofits. With its slim, space-saving profile, it fits easily into closets, attics, or crawl spaces while still delivering full-capacity heating and cooling when paired with a compatible condenser or heat pump. Engineered for durability, the air handler includes a galvanized steel cabinet, a high-efficiency ECM blower motor, and copper “A” coils with enhanced aluminum fins for superior heat transfer and humidity control. Thermal insulation inside the cabinet reduces energy loss and prevents condensation, contributing to quiet operation and lower energy bills. Installation is fast and simple, helping to minimize labor time and disruption. An air filter rack allows for easy maintenance, while an optional electric heat kit is available for added heating performance in colder regions. Smart home compatibility comes standard, with support for most third-party thermostats so you can manage comfort on your terms—no proprietary systems required. Protected by a 10-year limited parts warranty, the MRCOOL® Signature Series 42k Multi-Position Air Handler offers long-lasting performance, space-saving design, and year-round efficiency for today’s comfort-conscious homeowner.
Find the Brochure HERE.
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Key Specs
Capacity: 42k (≈3.5 ton)
Refrigerant: R-454B (low-GWP, eco-friendly)
Configuration: Multi-position (upflow, downflow, horizontal)
Design: Slim, space-saving profile for attics, closets, or crawlspaces
Cabinet: Durable galvanized steel construction
Blower Motor: High-efficiency ECM
Coil: Copper “A” coils with enhanced aluminum fins for superior heat transfer & humidity control
Insulation: Internal thermal insulation reduces energy loss, condensation & noise
Filter: Built-in filter rack for easy maintenance
Heat Option: Optional electric heat kit for colder climates
Thermostat Compatibility: Works with most third-party thermostats (smart home ready)
Warranty: 10-year limited parts warranty
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Compatibility
Signature Split System Heat Pump 42k 3.5 Ton R-454B 230V
Signature Split System Air Conditioner 42k 3.5 Ton R-454B 230V
Heat Kits for Signature Series R454B
Disclaimer:
The compatibility information provided in this article is specific to units within the same series. While additional compatibility with other series and units may exist, it is not detailed here. For further assistance or confirmation of compatibility with other systems, please contact MRCOOL support.
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Warranty
The MRCOOL warranty provides comprehensive coverage for your unit when installed by a licensed professional.
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Quick Links
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📞 (270) 366-0457
📧 support@mrcool.com
📝 Submit a support ticket
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