MRCOOL Signature Series 3.5 Ton 14.3 SEER2 Heat Pump Condenser | MCAESHS4T4221AA

Summary

The MRCOOL® Signature Series 42k Heat Pump Condenser is a powerful, energy-efficient solution designed to keep your home comfortable all year. With performance ratings of 14.3 SEER2 and 11.7 EER2, it delivers reliable heating and cooling while helping reduce overall energy use and utility bills. Whether you're facing summer heat or winter chill, this system is built to perform. Pre-charged with R-454B refrigerant, this model supports modern environmental standards with a lower global warming potential than older refrigerants. The pre-charged design also speeds up installation and reduces labor costs, making it a smart choice for contractors and homeowners alike. At its core, a single-speed scroll compressor ensures steady, long-lasting performance. Enhanced with inner-groove copper tubing, the system provides faster, more efficient heat transfer. Built-in temperature and pressure sensors offer real-time system monitoring and protection, while an intelligent defrost function prevents frost buildup for smooth operation in cold conditions. Operating at just 65 decibels, the unit stays quiet enough for residential use, aided by a sound-dampening top. Durability features include a steel louver coil guard, and a wire fan grille, the best for protecting internal components. The compact design allows flexible installation, and accessible service ports simplify maintenance. Backed by a 10-year limited parts warranty and a limited lifetime compressor guarantee, the MRCOOL® Signature Series 42k Heat Pump Condenser offers lasting comfort and confidence.

Important

AHRI certified - meets industry standards. Register your product to activate warranty coverage. This condenser contains R-454B refrigerant, which is classified as an A2L refrigerant. To comply with safety standards, this unit must be paired with an R-454B air handler or evaporator coil equipped with a leakage detection system. Failure to comply with these requirements may result in safety hazards and could void the warranty.

Key Features

• 42,000 BTU cooling capacity (3.5 Ton)
• 39,000 BTU heating capacity
• 14.3 SEER2 efficiency rating
• 11.7 EER2 efficiency rating
• 7.5 HSPF2 heating efficiency
• Scroll compressor for reliable operation
• Quiet operation (65 dBA)
• Pre-charged with R-454B refrigerant
• Factory pre-charged for 15-foot line set
• Compact design for easy installation
• Built-in protection sensors
• Intelligent defrost function
• AHRI certified
• Extended 150 ft maximum line set length

Complete Technical Specifications

Performance Features

Warranty Information

• Registered Warranty: 10 years parts, limited lifetime compressor
• Base Warranty: 10 years parts, limited lifetime compressor
• Registration may be required for full warranty coverage

Manuals & Certifications

Safety Information

PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Advanced Technology

The MRCOOL Signature Series 42k Heat Pump Condenser features a durable scroll compressor and energy-efficient design for reliable, quiet operation. The inner-groove copper tubing enhances heat transfer efficiency while the sound-dampening top reduces operational noise to just 65 decibels. Built-in sensors monitor internal temperature and pressure conditions, providing protection against extreme operating environments. The intelligent defrost function ensures optimal performance even in colder temperatures down to 5°F. With its 14.3 SEER2 cooling efficiency and 7.5 HSPF2 heating efficiency, this 3.5-ton heat pump condenser delivers powerful performance for year-round comfort in larger residential spaces.

Installation Advantages

This 3.5-ton heat pump condenser simplifies installation with its pre-charged R-454B refrigerant system. The unit supports extended line set lengths up to 150 feet, providing exceptional flexibility for challenging installation scenarios. The compact cabinet houses all components including the robust scroll compressor system. The accessible service valves and gauge ports make maintenance straightforward. The unit is designed to work with Signature Series Multi-Position or Stud Mount Air Handlers for complete system compatibility. The durable construction with steel louver coil guard and comprehensive warranty options make this condenser a dependable HVAC solution for larger residential applications requiring substantial heating and cooling capacity.