For 2026, MRCOOL delivers 24 SEER2 efficiency, while Zone Air offers 23 SEER2....

https://miasimpressiveperspective.quantlynix.com/posts/why-do-people-say-mrcool-warranty-claims-are-hard

For 2026, MRCOOL delivers 24 SEER2 efficiency, while Zone Air offers 23 SEER2. The choice comes down to your winter lows: choose MRCOOL for value when temperatures stay above -15°F, or Zone Air Hyper Heat for heating down to -22°F.