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Hi John, I can’t comment on the Outlander’s heat pump specifically, but I can comment on heat pumps generally. They work great and are more efficient than resistive heaters. However, they are usually less effective in truly cold temperatures (which you described, since below zero temps would likely be a challenge for a heat pump). From reports I have read re: plug-in cars with heat pumps versus resistive heaters, versus vehicles like the Sorento which just use its gas engine for heat, I would say that whenever you get much below 15 degrees F, heat pumps are likely to struggle. Depending on how often your driving conditions are below zero, you may want to consider a plug-in vehicle that uses a resistive heater and or that uses a gas engine to supply heat (for example if temperatures are that cold for several weeks or even months out of they year). I hope that helps… and perhaps finding someone that owns a Mitsubishi Outlander PHEV and lives in a similar climate and ask them how well their heat pump works might validate even better.