MRCOOL® Signature 1.5 Ton 18K BTU Split System Multi-Position Air Handler, MCAEAMPSF18C21AA

Product Description 

MRCOOL® Signature Series 18K Multi-Position Air Handler (230V)

The MRCOOL® Signature Series 18K Multi-Position Air Handler is designed to deliver reliable, efficient indoor comfort while offering the flexibility installers and homeowners need. Built to pair seamlessly with MRCOOL® Signature Series top-discharge condensers, this air handler supports upflow, downflow, and horizontal configurations, making it ideal for closets, attics, crawl spaces, and other tight installation areas.

Despite its compact footprint, this 1.5-ton air handler delivers strong airflow and consistent temperature control when matched with a compatible heat pump or air conditioner. The unit is fully compatible with R-454B refrigerant, supporting modern environmental standards without compromising system performance.

The cabinet is constructed from durable galvanized steel, designed to resist corrosion and wear over time. Inside, copper “A” coils with high-efficiency aluminum fins maximize heat transfer and moisture removal, improving comfort while helping keep energy costs under control. Internal thermal insulation reduces condensation and sound transmission, contributing to quieter operation and improved efficiency.

Installation is straightforward thanks to its installer-friendly design, saving time and reducing labor costs. A built-in filter rack allows for quick and easy filter changes, and the unit supports optional electric heat kits for enhanced heating performance in colder climates. Smart-home ready, this air handler works with most third-party thermostats, giving homeowners flexibility without locking them into proprietary controls.

Backed by a 10-year limited parts warranty, the MRCOOL Signature Series 18K multi-position air handler delivers dependable performance, installation flexibility, and long-term reliability—making it a smart choice for modern residential HVAC systems.

COMPATIBILITY & SYSTEM PAIRINGS 

✔ MRCOOL® Signature Series Top-Discharge Condensers

✔ Split-system heat pump applications

✔ Split-system air conditioner applications

✔ Optional electric heat kits compatible listed below.

1. 5kW      Model- MCAEHFD5X1AA

2. 7.5kW   Model- MCAEHFD7X1AA

✔ R-454B refrigerant systems

TECHNICAL SPECIFICATIONS 

Brand: MRCOOL

Series: Signature Series

Model: MCAEAMPSF18C21AA

Unit Type: Air Handler

Mount Type: Multi-Position

Capacity: 18,000 BTU

Tonnage: 1.5 Ton

Airflow: 749 CFM

Voltage: 208/230V

Phase: 1

Frequency: 60 Hz

Max Breaker: 3A

Min Circuit Ampacity: 2.1A

Refrigerant Type: R-454B

Liquid Line: 3/8”

Suction Line: 3/4”

Drain Connection: 3/4”

Blower Motor Type: PSC

Blower Motor HP: 1/4 HP

Blower Speeds: 3

Blower RPM: 830

Sound Rating: 53 dBA

Filter Type: Replaceable

Filter Size: 18 × 21 × 1

Metering Device: Orifice

Auxiliary Heat Included: No

Auxiliary Heat Available: Yes

Aux Heat Sizes: 5kW, 7.5kW

Certifications: AHRI, UL, CSA, ETL

ENERGY STAR®: No

Warranty:

• 10-Year Parts Warranty

DIMENSIONS & WEIGHT 

Net Dimensions:

• Width: 19.625”

• Depth: 22”

• Height: 45.75”

Net Weight: 120 lbs

Shipping Dimensions:

• Width: 22.83”

• Depth: 25.6”

• Height: 47.625”

Shipping Weight: 133 lbs

Frequently Asked Questions 

What configurations does this air handler support?

It supports upflow, downflow, and horizontal installations.

Which condensers work with this unit?

It pairs with MRCOOL Signature Series top-discharge heat pump and AC condensers.

Is this unit compatible with R-454B refrigerant?

Yes, it is fully compatible with R-454B refrigerant systems.

Can I add electric heat?

Yes. Optional 5kW or 7.5kW electric heat kits are available.

How loud is this air handler?

It operates at just 53 dBA, making it very quiet for residential installations.

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!

Feel Free to call us anytime. Family Friendly help just a dial away. We love talking HVAC
615-553-8118

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