MRCOOL Signature 42K BTU, 3.5 Ton, Split System Air Handler Multi-Position (MCAEAMPEF42C21AA)

MRCOOLSKU: MCAEAMPEF42C21AA
47 reviews

Price:
Sale price$1,321.69 Regular price$1,599.95SAVE 17%
Low Stock
Estimated delivery: Oct 6th-15th
Free Curbside Delivery — carrier calls to schedule

Free Curbside Delivery

Included on every order
Ships free by freight carrier. Your order leaves the warehouse tracked, on a palletized freight truck.
The carrier calls ahead. You'll schedule a delivery window that works for you before the truck heads out.
Delivered to the curb. The item is placed at the end of your driveway. Moving it inside is your responsibility, so plan to have help on hand for heavy pieces.
Before you sign: inspect the packaging for damage. Signing the delivery receipt confirms it arrived in good condition.

Description

The MRCOOL® Signature Series 42k Multi-Position Air Handler is built to provide consistent, energy-efficient comfort in any climate.

Designed for flexibility and performance, this unit works with R-454B refrigerant, a low-GWP alternative that helps reduce environmental impact without sacrificing power or reliability. Its multi-position design allows for installation in upflow, downflow, or horizontal configurations, making it ideal for a variety of home layouts, from new construction to tight retrofits. With its slim, space-saving profile, it fits easily into closets, attics, or crawl spaces while still delivering full-capacity heating and cooling when paired with a compatible condenser or heat pump. Engineered for durability, the air handler includes a galvanized steel cabinet, a high-efficiency ECM blower motor, and copper “A” coils with enhanced aluminum fins for superior heat transfer and humidity control. Thermal insulation inside the cabinet reduces energy loss and prevents condensation, contributing to quiet operation and lower energy bills. Installation is fast and simple, helping to minimize labor time and disruption. An air filter rack allows for easy maintenance, while an optional electric heat kit is available for added heating performance in colder regions.

Smart home compatibility comes standard, with support for most third-party thermostats so you can manage comfort on your terms; no proprietary systems required. Protected by a 10-year limited parts warranty, the MRCOOL® Signature Series 42k Multi-Position Air Handler offers long-lasting performance, space-saving design, and year-round efficiency for today’s comfort-conscious homeowner.

DIMENSIONS & WEIGHT
Net Dimensions (In)
22 D x 45.75 H x 19.625 W
Net Weight (Lbs)
131
Net Depth (In)
22
Net Height (In)
45.75
Net Width (In)
19.625
Gross Depth (In)
25.6
Gross Height (In)
47.875
Gross Width (In)
22.83
Gross Weight (Lbs)
144
GENERAL INFORMATION
Mount Type
Multi-Position
Color
Grey
Air Flow Direction
MULti-Position
Metering Device
Orifice
CAPACITY & PERFORMANCE
CFM
1254
Tonnage
3.5
Cycle
60
COMPRESSOR & MOTORS
Blower Motor Type
ECM
Blower Motor Hp
45720
Blower Motor Speeds
5
Blower Motor Rpm
1040
NOISE LEVELS
Decibel Rating (Dba)
54
ELECTRICAL REQUIREMENTS
Voltage (V)
208/230
Phase
1
Max Fuse Breaker (A)
10
Min Circuit Ampacity (A)
7.2
REFRIGERANT & PIPING
Refrigerant Type
R-454B
Liquid Line Size
3/8
Suction Line Size
3/4
FILTER & HEATING
Filter Type
Replaceable
Filter Size
18 * 21 * 1
Auxiliary Heater Included
No
Auxiliary Heater Available
Yes
Auxiliary Heater Sizes
  • 5kW
  • 7.5kW
  • 10kW
CONTROLS & CONNECTIVITY
Works With
Signature Series Top Discharge Condensers
Drain Connection Size
3/4
SAFETY
UL Listed
Yes
CSA Listed
Yes
ETL Listed
Yes
Energy Star Certified
No
AHRI Certified
Yes
Contains Electronics
Yes
Contains Chemicals
Yes
Contains Compressed Gas
Yes
Proposition 65 Warning
Yes
WARRANTY
Base Warranty
10 Year Parts, Limited Lifetime Compressor Warranty
Base Parts Warranty
10 Year
Base Compressor Warranty
Limited Lifetime
Shipping
  • Free Shipping on all orders.
  • Large Appliances: Ship via Curbside Delivery — the carrier delivers to your property but not inside your home.
  • Small Items: Ship via standard ground delivery (FedEx or similar), such as small appliances, range hoods, sinks, faucets, and accessories.
Full shipping policy
Returns
  • 30-Day Return Policy: Return requests must be submitted within 30 days of your delivery date. We cannot process returns after this period.
  • Return Requirements: Products must be unused, uninstalled, and in their original packaging (including box and pallet) to qualify.
  • Restocking Fee: A restocking fee may apply and varies by brand.
Full returns policy
Authorized MRCOOL Dealer
Full manufacturer warranty on every MRCOOL product we sell.

Customer Reviews

Based on 47 reviews
87%
(41)
11%
(5)
2%
(1)
0%
(0)
0%
(0)
J
Jim M. (Los Angeles, CA)
Easy to install and working great.

I needed to replace another unit that a previous contractor didn't do any part of that installation correctly, and the condensation line was leaking inside the house, running down the wall since that installation!! The indoor coil was 1-1/2" out of level, the line set wasn't wrapped, the electrical was tapped into the same circuit as the garage light and outlets...it was a mess.

It took me more time to demo the old unit out than to install the one I bought from you.

Thank you.

B
Bill (Philadelphia, PA)
Very pleased.

Very pleased with the price, delivery, ease of installation, and above all during this heatwave it is working excellently.

N
Natalie N. (San Jose, CA)
Perfect for our needs!

I ordered a 2 zone unit for the bedrooms in our home. It took a few months to arrive (manufacturer issue, nothing to do with HOD, and we were contacted on more than one occasion with an order update which was much appreciated!), but when it did arrive was very easy to install. Both the heat and AC function work perfectly, and our family is very happy!

R
Robert W. (Marietta, GA)
Decent Company

I ordered a HVAC system and it arrived in a timely manner and with no apparent issues. I thought the system was defective once installed but it was the installers fault who wired it wrong. My only issue would be the fee (30% I believe) to return a defective item within the 30 day return policy. If it is defective the customer shouldn't have to pay a fee to return an item that is not operating as designed. Other than that this is a good company.

P
Peter K. (Phoenix, AZ)
Pretty Easy Install and Works Great!

Installed my own central HP system. It was a bit of work but nothing beyond a person with basic mechanical and electrical skills. It took me a while because I had to remove the existing electric forced air furnace from a pretty tight place. Some custom sheet metal work and a bit of custom electrical too. Worked perfectly when powered up and I actually like the thermostat provided, although I wish it was clearer how to set up a temperature set-back schedule. Pre-charged refrigerant piping was something new and I liked that too. The best thing is that my electric utility forked out $4,000 and that paid for the unit!

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