MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make a close matchup. Choose MRCOOL...

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

MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make a close matchup. Choose MRCOOL for best value above -15°F; pick Zone Air Hyper Heat for heating down to -22°F. Let your coldest nights—not the one-point efficiency gap—make the call.