They don't compromise - even when a compromise would strictly improve the world. Well, most voters hate to make compromises but the greenies seem to do it harder. In NZ we have a very left wing Green Party who in theory could have power in a minority coalition with our "conservative" party. However politically it would never work. I think both parties veto working together, but New Zealand loses out on green progress because of that. Instead the Greens only make a coalition with the left, which is already quite green focused so the Greens remain rather impotent.
Conservative greeny voters in New Zealand need better representation.
Fortunately our heat pumps usually also have AC. I can only guess we don't have any insane rules about that because having a heatpump with AC has been normal for decades (AC isn't just for the hated tall-poppy wealthy: and very few have a dedicated aircon unit).