MRCOOL® Signature 3.5 Ton 42K BTU Split Air Conditioner Condenser, MCAESAS4T4221AA

Product Description 

 

MRCOOL® Signature Series 42K 3.5-Ton Cooling-Only AC Condenser (230V)

The MRCOOL® Signature Series 42K (3.5-Ton) Air Conditioner Condenser is designed for homeowners who need strong, dependable cooling for larger living spaces while keeping energy costs under control. It’s an ideal solution for replacing older AC systems or installing a new cooling-only setup in warm-weather regions.

With efficiency ratings of 14.3 SEER2 and 11.7 EER2, this condenser delivers consistent cooling performance without unnecessary energy waste. The unit ships factory pre-charged with R-454B refrigerant, a next-generation, low-GWP refrigerant that meets modern environmental standards while maintaining reliable cooling output. The factory charge also helps reduce installation time and labor costs.

At the heart of the system is a durable single-speed scroll compressor, trusted for steady operation, long service life, and quiet performance. Inner-groove copper tubing improves heat transfer efficiency, helping the system cool evenly and respond quickly during high-demand conditions.

Despite its larger capacity, the unit operates at just 65 dBA, making it suitable for residential neighborhoods. A sound-dampening top, combined with a steel louvered coil guard and wire fan discharge grille, helps minimize noise while protecting internal components and extending system lifespan.

Designed to pair seamlessly with MRCOOL® Signature Series multi-position or stud-mount air handlers, this cooling-only condenser is backed by a 10-year limited parts warranty and a limited lifetime compressor warranty, giving homeowners long-term confidence in their investment.

For homes that require higher cooling capacity, quiet operation, and proven reliability, the MRCOOL Signature Series 42K AC condenser is a smart, long-term solution.

 

COMPATIBILITY & SYSTEM PAIRINGS

✔ MRCOOL® Signature Series Multi-Position Air Handler

✔ MRCOOL® Signature Series Stud-Mount Air Handler

✔ Cooling-only split-system applications

✔ Factory pre-charged R-454B refrigerant

✔ VersaPro Furnace 

 

TECHNICAL SPECIFICATIONS 

Brand: MRCOOL

Series: Signature Series

Model: MCAESAS4T4221AA

Unit Type: Split System Air Conditioner Condenser

 

Cooling Capacity: 39,000 BTU

Tonnage: 3.5 Ton

SEER2: 14.3

EER2: 11.7

 

Voltage: 208/230V

Phase: 1

Frequency: 60 Hz

Max Breaker: 45A

Min Circuit Ampacity: 26A

 

Refrigerant Type: R-454B

Refrigerant Charge: 114.6 oz

Liquid Line: 3/8”

Suction Line: 3/4”

Max Lineset Length: 150 ft

 

Compressor Type: Single-Speed Scroll

Inverter Driven: No

Minimum Ambient Cooling: 59°F

Sound Rating: 65 dBA

 

Certifications: AHRI, UL, CSA, ETL

ENERGY STAR®: No

Warranty:

• 10-Year Parts Warranty

• Limited Lifetime Compressor Warranty

 

DIMENSIONS & WEIGHT

Net Dimensions:

• Width: 29.14”

• Depth: 29.14”

• Height: 32.875”

Net Weight: 185 lbs

Shipping Dimensions:

• Width: 30.3”

• Depth: 30.3”

• Height: 34.8”

Shipping Weight: 195 lbs

 

Frequently Asked Questions 

Is this a heat pump or cooling-only unit?

This is a cooling-only air conditioner condenser and does not provide heating.

What air handlers are compatible?

It pairs with MRCOOL Signature Series multi-position, stud-mount air handlers and VersaPro Furnace. 

Is R-454B refrigerant environmentally friendly?

Yes. R-454B is a low-GWP refrigerant designed to reduce environmental impact.

 

How loud is this condenser?

It operates at 65 dBA, similar to common household appliances.

 

What warranty coverage is included?

MRCOOL backs this unit with a 10-year parts warranty and a limited lifetime compressor warranty.

 

Why Buy From MRCOOL DIRECT?

When you order from MRCOOL Direct, you get:

• ✅ Authorized MRCOOL® dealer – Your warranty is protected
• ✅ Factory-fresh units – No refurbished or mystery sources
• ✅ Fast U.S. shipping – Most in-stock items ship in 1–3 business days
• ✅ Financing options – Make high-efficiency comfort more affordable
• ✅ Real product support – Help with sizing, line set selection, and DIY questions
• ✅ No third-party marketplace middlemen – Just genuine MRCOOL® systems from a trusted MRCOOL® dealer.

BUY DIRECT!

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615-553-8118

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