For 2026, MRCOOL vs. Zone Air comes down to priorities: MRCOOL’s 24 SEER2 leads...

https://codysnewinsight.swiftnestly.com/posts/should-i-inspect-line-set-insulation-and-connections-every-year

For 2026, MRCOOL vs. Zone Air comes down to priorities: MRCOOL’s 24 SEER2 leads on efficiency, while Zone Air’s 23 SEER2 may be the better value above -15°F. Need heat in harsher cold? Choose Hyper Heat, rated down to -22°F.