4 Ton 18 SEER MRCOOL Universal Series Heat Pump System



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AHRI Number:205756413

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The MRCOOL Universal Unitary Heat Pump system is an easy to install, full size air handler with a slim condenser, suitable for most 4-5 ton applications. This system is incredibly flexible, combining the ultimate in ducted comfort and easy installation. The 5 ton condenser can be field converted to a 4 ton with a different dip switch setting. The quick connect fittings on the condenser and air handler allow for an easy installation processes with MRCOOL's pre-charged lines, available as an accessory up to 50 feet in length. Using the same inverter technology used by the MRCOOL mini splits, the system can run at different speeds to optimize comfort and efficiency.


  • Comes with quick connect fittings for easy installations
  • 4 ton or 5 ton setting
  • 80% BTU output at -4°F oudside temperature
  • Fireproof electrical box
  • Upflow and horizontal installation only


  • No gas required; all electric system
  • Compatible with 3rd party thermostats; use your favorite or upgrade to a smart thermostat
  • No specialized tools required for installing the line sets
  • MRCOOL temperature compensation technology helps keep you comfortable in any weather condition

MDU18048060 System

  • MDUI18048 Indoor Unit
  • MDUO18048 Outdoor Unit

Product Specifications

More Information
4 Ton 18 SEER MRCOOL Universal Series Heat Pump System
Weight (in lbs) 555.300000
AHRI Certificate Number 205756413
Manufacturer MRCOOL
Controller Not Included
HSPF 10.5
Cooling BTU 48,000 BTU
Heating BTU 48,000 BTU
Maximum CFM 1600
Decibel Level (dBA) Indoor Unit: 50 | Outdoor Unit: 64
Electric Heat Heat Pump
Electric Backup Heat Capabilities (Optional) 15 Kilowatts, 20 Kilowatts
Energy Star Yes
Refrigerant R410A
System SEER 18+
SEER 18-20
EER 11
Condenser Stages Variable Speed
Compressor Type Rotary
Liquid Line 3/8"
Suction Line 3/4"
Electrical 230 V. 1 Phase 60 Hz
Max Breaker Size Indoor Unit: 15A | Outdoor Unit: 45A
Min. Breaker Size Indoor Unit: 4A | Outdoor Unit: 35A
Tonnage 4 Ton
System Tonnage 4 Ton
Mini-Split Type Multi-Positional
Min/Max Outdoor Temp for Heating -22°F-75°F
Min/Max Outdoor Temp for Cooling 5°F-129°F
Zone Compatibility Single Zone
Height Indoor Unit: 57" | Outdoor Unit: 53-3/4"
Width Indoor Unit: 24-3/4" | Outdoor Unit: 42-3/4"
Depth Indoor Unit: 21-1/4" | Outdoor Unit: 14-1/2""
Additional Info Indoor Unit: 202 lbs | Outdoor Unit: 308 lbs
Warranty 10 Years with Online Registration
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety Information PROPOSITION 65 WARNING

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Questions and Answers

Customer Questions
Trunk line size
The Sizing Guidetowards the bottom of our page will help you determine the right size for your home. For Duct Sizing please check our website as well. If you are still unsure, please give us a call and one of our experts will assist you in finding the appropriate size.
Would a 4 ton or 5 ton work in a greenhouse that is 1800 square feet for year round production?
There are a lot of additional factors to consider when choosing a heat pump system for a greenhouse. Give us a call and our experts will cover all the details regarding your greenhouse's setup. They can point you to the right system you need. If you have any further questions, please call us and we will be happy to assist you.
Is this unit a down or up draft unit?
<p> This unit can be installed in both the upflow and horizonatal position.</p>
How many amps does the condenser draw...airhandler
For the air handler you will need a minimum circuit ampacity of 4 amps and a maximum overcurrent protection (A) of 15 amps. For the outdoor condenser, you will need a minimum circuit ampacity of 35 amps and a maximum fuse size of 45 amps. For more assistance, please give us a call at 1-888-377-2850. 
Where are they manufactured?
MRCOOL is based out of Kentucky however most of their mini-splits are manufactured in China.
Can you use the existing freon lines at a home?
The Mr. Cool Universal series uses pre-charged 'quick connect' line sets which are a specialized product that allow for connection without using a brazing torch to 'sweat' the refrigerant lines together. Other, similar brands are available without these quick connect fittings. The Quick Connect fittings can be removed, which would allow you to re-use traditional copper, but then you would need to use copper stubs and an acetylene torch to sweat the connections. If you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representative and they would be happy to assist you. Thank you and have a wonderful day.
When r410a is eliminated will these systems be able to swap to the new refrigerant?
Great question. Today’s equipment is specifically engineered to use R410a refrigerant only. Due to every refrigerant having its own unique pressure/temperature relationship, it will not be possible to use another refrigerant in a piece of equipment except for what it is engineered to use. If you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representative and they would be happy to assist you. Thank you and have a wonderful day.
Does this come with a thermostat? If not what one is recommended?
Thank you for your question. This system does not include a thermostat. It is compatible with most 3rd party thermostats. You can even upgrade to a smart thermostat if that is something that interests you. The only thing to make sure of is that when installing the thermostat that the wiring diagram if followed correctly. Some of our best selling thermostats for this system are the Cielo Breez and the Ecobee. For more assistance, please give us a call.
Can this system be zoned?
Thank you for your question. Yes, since this system utilizes the ductwork in the same way as a traditional system, it should be fully compatible with zoning and dampers.
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