We turned ours on last night. We've had several cool nights but yesterday I was cold in the middle of the afternoon - took that as a sign and turned on the heat to warm it up two degrees. Felt so much better afterwards
If it's 14C (57 F or so) in the house when I get up and I know that it won't warm up during the day, I turn it on. So far so good, though we've had a couple of close calls. Nights have been near freezing here for a few weeks, so I know I'll turn the heat on soon.
I'm in Ontario and still sleep with our bedroom window open a crack and a fan on low. We'll probably quit the fan and close the window soon, but I'd like to try to make it to December 1 without turning the heat on if I can. Obviously, if it's too cold before then I will put it on, but we live in an apartment building and the sun is on our side of the building nearly all day, so our place stays relatively warm throughout fall.
I considered it this morning when, passing the thermostat, I saw that it read 67 degrees. I thought to myself that I will have to remind myself later this winter, that 67 degrees is not that cold. Since I recall waking to 64 degrees or so last winter and thinking I was freezing!
We didn't use the heat at all last year and we don't have air-conditioning. One of the perks of living in San Diego is the climate. It gets cool (32+ in the wee hours in "winter") and it gets hot (over 100 degrees expected today in my zip code), but the extremes are relatively short-lived and we make do and adapt.
I literally just turned the AC off today. It was in the 90s all last week and most of the weekend. It's supposed to be cooler this week, but I don't think we'll be turning on the heat for another month, at least.
we haven't even thought about turning the heat on yet...yesterday was the first day that the air conditioner wasn't running ALL DAY LONG. To answer your question though...I'm a southern girl that cannot stand to be cold so if the house temp is below 67-68 the heat is coming on