jerryc41 wrote:
When you want the most from your car's air conditioner, you set it to Recirculate. Wouldn't the same thing work with the car's heater? Instead of heating the 20° air from outside to 70°, the heater would be maintaining the 70° air inside the car. Of, course, you could switch it to Fresh Air occasionally.
In cold weather I always use recirculate with the heater until the inside temp gets to (approaches) where I want it to be.
The cabin heats up faster.