My OH (we don't live together) says I'm obsessed with fresh air and wishes I didn't open the back door and most of the windows every morning for a couple of hours when the weather is no longer mild as it is in the summer. He's quite happy to open a window for ten minutes and that's it. When I stay at his I wish he did get more fresh air in but it's his place and he can do as he pleases of course.
I like to get fresh air in the house in the morning, especially since I have three dogs (the place - I've often been told - does NOT smell of dogs. Possibly because there is no carpet in the house and the dogs are not allowed on the beds and because of the above window opening!) and believe it's important to get rid of the overnight, stale air and also try to discourage mould/condensation, bacteria, etc. linked to not opening windows for long enough, often enough.
The heating isn't on when the door and the windows are open but comes on afterwards. I do admit that in between me closing everything and the place getting warm it takes a little while because the fresh air is cooler than the air that was in the house. So I was wondering whether IABU.