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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
| Brand | MRCOOL |
| Series | Signature Series Heat Pump Condenser |
| Model | MCAESHS4T4221AA |
| UPC | 840255595810 |
| GTIN | 00840255595810 |
| Unit Type | Split System Heat Pump Condenser |
| Certifications | UL Listed, CSA Listed, ETL Listed, AHRI Certified |
| Cooling Capacity | 39,000 BTU (3.5 Ton) |
| Heating Capacity | 39,000 BTU |
| Efficiency Ratings | 14.3 SEER2, 11.7 EER2, 7.5 HSPF2 |
| Refrigerant | R-454B (119.9 oz) |
| Electrical | 208/230V 1 Phase 60 Hz |
| Min Circuit Ampacity | 26A |
| Max Fuse Breaker | 45A |
| Compressor Type | Scroll |
| Condenser Fan Motor | PSC, 1/7 HP |
| CFM | 2950 |
| Sound Rating | 65 dBA |
| Min Ambient Cooling | 59°F |
| Min Ambient Heating | 5°F |
| Max Lineset Length | 150 ft |
| Liquid Line Size | 3/8" |
| Suction Line Size | 3/4" |
| Net Dimensions (HxWxD) | 32.875" x 29.14" x 29.14" |
| Net Weight | 202 lbs |
| Shipping Dimensions | 34.8" x 30.3" x 30.3" |
| Shipping Weight | 212 lbs |
Performance Features
| Compatible Equipment | Signature Series Multi-Position or Stud Mount Air Handlers |
| Compressor Technology | Scroll compressor for durability and efficiency |
| Refrigerant | Eco-friendly R-454B with lower global warming potential |
| Noise Reduction | Sound-dampening design for quiet operation (65 dBA) |
| Protection Features | Built-in sensors monitor temperature and pressure |
| Defrost System | Intelligent defrost function for cold weather operation |
| Extended Installation | Supports up to 150 ft line set length for flexible placement |
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.
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We will prepare your order within 24 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION: Please be kindly informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery. To AVOID delays, please check if the provided phone number in the order details is a current number where you can be reached. You can also contact the carrier directly and refer to your tracking number to set up a date and time for your appointment. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. PLEASE verify your shipping address, as changes to the address after freight has shipped can result in an additional 15% or higher fee depending on freight weight and dimensions.
SMALLWARES INFORMATION: Please be informed that for smaller items, such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves, when these items are ordered individually, they may be shipped via FedEx without a signature requirement. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING: Please inspect your boxes thoroughly when you receive them. They should arrive shrink-wrapped and on a pallet. If you notice any damages or imperfections (e.g. crushed box or forklift hole), please write comments on the receipt before signing for delivery, no matter how small damages seem. Contact us immediately to assist you.
Shipping & Delivery
We will prepare your order within 24–48 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION
Please be informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery.
To AVOID delays, please make sure the phone number in your order details is accurate and one where you can be reached. You may also contact the carrier directly using your tracking number to schedule your delivery.
It is your responsibility to ensure a safe and secure delivery environment. We are not liable for any packages that are stolen or lost after delivery is confirmed.
Please verify your shipping address carefully. Changes to your shipping address after the freight has been shipped may result in additional fees of 15% or more, depending on freight weight and dimensions.
SMALLWARES INFORMATION
Smaller items such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves may be shipped via FedEx without a signature requirement if ordered individually.
It is your responsibility to ensure a safe delivery location. We are not liable for packages lost or stolen after delivery confirmation. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING
Please inspect your boxes carefully upon delivery. Shipments should arrive shrink-wrapped and on a pallet. If you notice any damage or signs of mishandling (such as a crushed box or forklift puncture), write comments on the delivery receipt before signing, even if the damage appears minor.
Contact us immediately if any issues arise so we can assist you promptly.
SMS Delivery Notifications
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