MRCOOL Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA — front hero view
MRCOOL Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA — side detail view
MRCOOL Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA — install/detail view
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MRCOOL Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA — front hero viewMRCOOL Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA — side detail viewMRCOOL Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA — install/detail view

Mrcool Signature Series Multi-Position Air Handler MCAEAMPEF42C21AA

★★★★★
Iron Line Verified
Authorized Dealer: MRCOOL
Official Partner
IN STOCK & READY TO SHIP
SKU: MCAEAMPEF42C21AA
Price:
$1,343.44
Estimated delivery: 2–13 business days Order before 2:00 PM ET. Handling takes 1–3 business days and transit 1–10 business days. Tracking is emailed when it ships.
Pay over time with Shop Pay Choose Shop Pay at checkout. Subject to approval.
  • Authorized MRCOOL dealer
  • A+ customer service
  • Multiple financing options
  • We pay sales tax (IL excluded)

Talk to a MrCool expert: (888) 308-5580 Mon–Sun, 7:00 AM–7:00 PM Central

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We pay your sales tax! (IL excluded) 📦 

  • Tonnage: 3.5
  • Warranty: 10 Year Parts, Limited Lifetime Compressor Warranty

Estimated Delivery Timeline

Order Placed

Ships Out

Delivered

*Please Note: This timeline is an estimate. Certain products may require an additional 1 week for manufacturing. Please speak with your sales rep, Matthew, for official details and confirmation before placing your order.

CALL US FOR THE MOST ACCURATE AND COMPETITIVE LTL SHIPPING RATE, (888) 308-5580

Get Questions Answered Fast

Experience: 20+ Years B2B • Origin: US-Based Support
EXPRESS SHIPPING

EXPRESS SHIPPING

Most orders process in 1-3 days. Yes, even if it weights 400lb

Hassle-Free Returns

Hassle-Free Returns

No restocking fees. Ever.

Manufacturer Warranty

Manufacturer Warranty

Fully backed by the brands you trust.

Dedicated Rep Mathew

Dedicated Rep Mathew

Speak to a US-Based Equipment Specialist: (888) 308-5580

Flexible Financing

Flexible Financing

Get Upto 60 Months Financing

Key Information

  • Order Cutoff Time: 2:00 PM EST
  • Order Handling Time: 1–3 business days (Monday–Friday)
  • Transit Time: 1–7 business days (Monday–Friday)
  • Total Estimated Delivery Time: 3–11 business days (Monday–Friday)
  • Shipping Availability: Free Shipping On some Items In The Contiguous United States only

    For more information Click Here
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Engineering Toolsuite

Industrial calculations for facility planning and financial justification.

1. Facility & Utility Sizing

Airflow, thermal load, and suction requirements.

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2. Safety & OSHA Compliance

Noise limits, combustible dust, and shop layout safety.

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3. CAPEX & Strategic Analysis

Section 179, Labor ROI, and downtime revenue loss.

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Facility & Utility Sizing

Airflow Sizer (CFM)

Calculate ventilation for cooling and air quality.

Dehumidification (PPD)

Determine moisture removal for curing or climate control.

Dust Collection (CFM)

Required suction for material extraction.

Machine Thermal Load

Size cooling based on machine BTU output.

Safety & OSHA Compliance

OSHA Noise Exposure

Calculate daily noise dose and legal limits.

Combustible Velocity

Required FPM to move materials safely through ducting.

Heat Stress Index

Workplace danger zones based on heat and humidity.

Safe Machine Spacing

Physical footprint including material handling clearance.

CAPEX & Strategic Analysis

Section 179 Savings

Immediate tax deduction for equipment purchase.

Cost of Inaction

Revenue bleed from legacy equipment downtime.

Labor ROI (Payback)

Months until machine labor savings covers the cost.

Material Waste Savings

Monthly profit increase from scrap reduction.

Airflow Sizer

Recommended Airflow:

0 CFM

Dehumidification

Moisture Removal:

0 PPD

Dust Collection

Min. Suction Needed:

0 CFM

Machine Thermal Load

Heat Output:

0 BTU/hr

Cooling: 0 Tons

OSHA Noise Dose

Daily OSHA Dose:

0%

Duct Velocity

Required Volume:

0 CFM

Heat Stress Index

Feels Like:

0 °F

Safe Footprint

Safe Shop Area:

0 Sq Ft

Section 179 Savings

Tax Savings:

$0

Net Cost: $0

Cost of Inaction

Monthly Loss:

$0

Labor ROI

Payback Period:

0 Months

Waste Reduction

Monthly Savings:

$0

Request Expert Consultation

Our tool specialists are ready to help you find the perfect solution for your specific application.

Your information is secure and will only be used to respond to your inquiry.

Why buy from Iron Line Tools

☎
Talk to a real expert right awayCall (888) 308-5580 now. A real person answers 7 AM–7 PM CT, 7 days a week.
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We pay your sales taxSales tax is on us (IL excluded).
$
Pay over timePay over time with Shop Pay Installments at checkout, subject to approval. Questions? Call (888) 308-5580, Mon–Sun 7:00 AM–7:00 PM Central.

MRCOOL DIY questions, answered

Can I really install an MRCOOL DIY mini-split myself?
Yes. MRCOOL designed its DIY series for homeowner installation, with no special tools or training needed. The line sets come pre-charged with refrigerant and use Quick Connect® fittings, so there's no vacuum pump or refrigerant handling. Electrical hookup should follow your local code, and many areas require a licensed electrician for that part.
What size mini-split do I need?
MRCOOL's general guide for wall-mounted units with 8 ft ceilings: 6K BTU up to about 200 sq ft, 9K up to 400, 12K up to 550, 18K up to 800, 24K up to 1,050 and 36K up to 1,550. Insulation, windows, ceiling height and climate all change the answer, and MRCOOL recommends a professional load calculation for best results.
Do I need 115V or 230V?
In the 5th Gen DIY single-zone line, the 9K and 12K run on 115V. The 18K, 24K and 36K need 208/230V. Check the spec sheet on each product page for the circuit size.
Single zone or multi-zone?
A single-zone system has one indoor unit for one room. A multi-zone system runs two to five indoor units from one outdoor unit, so each room can be set to its own temperature. See our multi-zone systems, or call us and we'll help size each room.
What warranty comes with it?
The warranty comes from MRCOOL. For the 5th Gen DIY condensers, MRCOOL lists a base warranty of 5 years on parts and 7 years on the compressor. See MRCOOL's warranty terms for registration and installation requirements.
How long does shipping take?
Orders placed before 2:00 PM ET are handled in 1–3 business days, and transit takes 1–10 business days, so most orders arrive within 2–13 business days. Shipping cost is shown at checkout. You'll get tracking by email as soon as it ships. See our shipping policy.
Can I return it?
Yes, and we don't charge restocking fees. Contact us first at info@ironlinetools.com or (888) 308-5580, and see our refund policy for the details.
Do you offer financing?
Pay over time with Shop Pay Installments at checkout, subject to approval. Questions? Call (888) 308-5580, Mon–Sun 7:00 AM–7:00 PM Central.
CAPITAL ACCESS

EQUIPMENT FINANCING

AVAILABLE

Preserve cash flow with up to 60 month financing.

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Frequently Asked Questions for MRCOOL
The MRCOOL MCAEAMPEF42C21AA is a 3.5-ton multi-position air handler.
This air handler uses R-454B refrigerant.
This unit delivers 1,254 CFM of airflow.
This air handler operates on 208/230V, single-phase power.
This unit operates at a noise level of 54 dBA.

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