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I guess you mean a "remote starter"?
You get zero miles per gallon idling and the fastest way to warm up all parts of a car is to get in it and go, gently for the first mile or so.
Car electronics are getting "trickier" but for most cars the battery shouldn't be affected unless it was installed improperly but I'd be dubious of any aftermarket remote start. Most are probably fine, but I sure read a lot of posts on the Edmunds Forums and here on Answers where people have no start problems and they either have an older aftermarket alarm system or remote start installed.
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