In this 2026 DIY mini split comparison, MRCOOL delivers 24 SEER2 efficiency,...

https://oliviamaids.com/can-a-multi-zone-diy-system-heat-and-cool-a-whole-house/

In this 2026 DIY mini split comparison, MRCOOL delivers 24 SEER2 efficiency, while Zone Air offers 23 SEER2. The choice comes down to value above -15°F or Zone Air Hyper Heat for dependable heating down to -22°F.