Here in Canada Honda's EU3000iS features what the manufacturer calls
Cold Climate Technology. To whit ...
"Exclusive to Canada. Honda's industry leading "Cold Climate Technology" is specifically designed for our cold Canadian winters. Our exclusive breather heater system helps keep the crankcase ventilation tube free of ice formation and helps prevent generator shutdown."I imagine this is what you're talking about and if the part(s) necessary can be purchased and installed on a US model it would seem logical to me that this would solve this problem with this US model running properly in very cold temperatures.