I'm sort of the same way, not an environmentalist, just a really cheap mustachian. My average usage each month is about 200kwh and I live lasciviously, I know if I watched my usage a bit more I could greatly decrease this. As I write this I have a fan in my window blowing in and another in the window down the hallway blowing out and can get my house down to 66F at night, and then reach about 72F by the time I get home from work, but grant it we live in the Pacific Northwest where AC is hardly ever needed. We don't use our dryer but sparingly, and I ride a bike to work instead of driving because it seems insane to pay $300+ a month in gas PLUS the $1200+ a year in maintenance to maintain a residence 30 miles away. All of this is done not for the environment but because it's cheaper.
When I do drive a car I hypermile it. My 2002 BMW 525i gets 32+MPG which usually elicits a wide eyed "really?" from people when I tell them. A single tank of gas lasts me about a month and a half. We buy a lot of things used because I figure that buying it second hand will retain the value more than buying it brand new. My wife's wedding ring and her Longine watch were both bought that way, same as my trumpet and my car. Buying used keeps one from going to the dump and lowers demand on new ones to be made. (Of course the ring would have been melted down and formed into new rings, but it still applies to everything else.)
I also happen to be one who believes the scientific research and consensus that climate change is happening, and I wish it had more effect on my decision making, but for now being cheap seems to generally coincide with environmentally friendly. Most of this is from learning to want less shit that doesn't matter and to be perfectly happy living the very luxurious middle class life.