4 Existing Zones

How to Select Your System (Please read)

If you have 4 existing zones to which you'd like to add heating/cooling. And if you plan on having a 5th zone down the road. Then you're in the right place. The MRCOOL® configurations below all support a 5th, future zone. All you have to do is match your existing zones to one of the products below.

For each product, the green on the left represents your existing zones, the yellow on the right represents the zones you may add.

Don't see your home's configuration below? Send us an email - we can help. CLICK HERE to request help.

This coverage chart will help you determine how many BTUs are required for the space you would like to cool and/or heat, and, therefore, which air handler you should use for each zone (note that the right Condenser/outdoor unit is automatically selected - you don't have to worry about it.). Remember to always round up to the nearest largest size zone for your square footage:

Wall Mount Units

"sf" means Square Feet
  • If your zone is between 180-375 sf, you need a 375 sf Air Handler (9K / 9,000 BTU)
  • If your zone is between 376-500 sf, you need a 500 sf Air Handler (12K / 12,000 BTU)
  • If your zone is between 501-750 sf, you need a 750 sf Air Handler (18K / 18,000 BTU)
  • If your zone is between 751-1,000 sf, you need a 1,000 sf Air Handler (24K / 24,000 BTU)
  • If your zone is between 1,001-1,500 sf, use the 1,500 sf Air Handler (36K / 36,000 BTU)

Ceiling Cassette Units

  • If your zone is between 180-375 sf, you need a 375 sf Air Handler (9K / 9,000 BTU)
  • If your zone is between 376-500 sf, you need a 500 sf Air Handler (12K / 12,000 BTU)
  • If your zone is between 501-750 sf, you need a 750 sf Air Handler (18K / 18,000 BTU)
  • 751-1,000 Square Feet (sf) - Not Available
  • 1,001-1,500 Square Feet (sf) - Not Available

Note: The product configurations below work with all your existing zones, and they ensure that when the future zone is added, even if all indoor units (air handlers) were to run simultaneously, their combined BTU output would not exceed the BTU rating of the outdoor unit (condenser).

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