Frequently Asked Questions

• How do I choose between horizontal, vertical, and multi-position cased coils for my air handler?

  Match the coil to your duct layout and equipment orientation. Horizontal suits attic/crawl spaces, vertical fits upflow or downflow cabinets, and multi-position provides flexibility when layouts vary. Always follow airflow arrows and ensure proper drain pan slope.

• Which refrigerant coil (R-32, R-410A, or R-454B) matches my existing or new condenser?

  The coil and its metering device must be rated for the same refrigerant as the outdoor unit. Do not mix refrigerants. Use the correct TXV/orifice and filter drier specified for R-32, R-410A, or R-454B.

• Will a 21" or 24.5" cabinet width coil fit my current furnace or air handler?

  Measure the cabinet’s external width. Choose 21" or 24.5" to match. If sizes differ, a transition or plenum modification may be required. Also verify coil height/depth clearances for service access.

• Can a 3.5-4 ton cased coil be used with a 5-ton system?

  Generally no. Use the coil size approved in the AHRI match for your outdoor unit. Undersizing can reduce capacity and efficiency. Stick with a 3.5 or 4 ton coil for 3.5-4 ton systems.

• Do I need a licensed contractor to braze and evacuate the system when replacing a coil?

  Yes. A licensed pro should recover refrigerant, nitrogen-braze, pressure test, evacuate to deep vacuum, and weigh in charge. This is required by code and typically for warranty compliance.

• Are Goodman and Rheem coils interchangeable with other brands if coil size and refrigerant match?

  Sometimes, if an AHRI-rated match exists and line sizes, TXV, and capacity align. Cross-brand use can affect warranty, so verify compatibility and documentation before installing.

• What additional accessories (TXV, drain pan, line set) are required when replacing a cased coil?

  Plan for a refrigerant-specific TXV, filter drier, properly sized line set, condensate trap and drain, float switch/secondary pan for attics, and any needed plenum or transition pieces.

• How do I verify tonnage compatibility from the model number of my outdoor unit?

  Most models embed capacity: 42 ≈ 3.5 tons and 48 ≈ 4 tons. You can confirm using the AHRI directory or the unit’s data plate to ensure the indoor coil is correctly matched.

• What’s the difference between R-32 and R-454B for future upgrades?

  Both are low-GWP A2L refrigerants. R-32 offers strong capacity; R-454B has even lower GWP. Choose the coil that matches your outdoor unit and local code requirements for A2L systems.

• Are these coils suitable for light commercial use?

  Yes, 3.5-4 ton coils are common in small offices and retail suites. Verify required CFM, static pressure, orientation, drain provisions, and code compliance before selection.