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Is there some reason NOT to use range mode?

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Seems like Range Mode reduces air conditioning cooling capacity. Is barely adequate in normal mode. Often inadequate AC when in Range Mode.

In summer time I won’t care if range mode is on and likely have it off. It’s in winter I prefer it not heating the battery on short runs.

I’ve not gone through a summer yet but the only reason I got a 7 seater was for the larger AC compressor and a separate rear condenser for my pups.
 
It doesn’t disable HVAC
Obviously. No one is claiming it disables your heating or cooling.
it just runs it more efficiently
It's a resistive heating element. There isn't any "more efficiently". It's always at 100% in just converting electricity into heat. This is the same kind of effect where you are trying to fill up a bucket with water, but you claim you are doing it "more efficiently" by only having your faucet turned on halfway.
which might not heat or cool as quick but it’s still gonna.
Yeah, it will be slower to heat up you and the cabin, which a lot of people don't want in cold winter weather.