I like being warm all year around, mostly because it's actually quite difficult for me to stay warm.
But one reason why I don't like summer as much is that I get some of the strangest weather conditions resulting in power failure.
Actually, if you analyse how effective the body is in creating heat and dispersing it, you'd find that humans are actually more efficient in dispersing heat than we are creating it.
Around here, weather in the winter and the summer both cause equal numbers of power failures.