In my 1931 house at the southernmost part of Canada, my basement is a constant 68°F....Works well with my preference for traditional English styles, but I really do need to build a ferm-chamber so I can both improve on those as well as do a wider variety. I do have a lager on the horizon, but I'll be doing that in a pressure-fermenter, either my Fermzilla or a sanke with my Fermhead attachment.
I live in Minnesota, have a 7 cu ft freezer in the garage with an Inkbird ITC-1000 controller. For heat I use a 50w IR terrarium heater with a computer fan to move the heat around inside. On particularly cold days I add a 20w seedling mat to provide more heat. Never a problem keeping the ferm chamber at ale temps.
I ferment everything in two beverage coolers in the basement. One of them does have a heat pad that I can use in the rare occasions that I need to ferment something at a warmer temp.
I live in northern Wisconsin, my basement temp is fine for most beers. If it's a little slow fermenting that's fine for me, no rush. We're just brewing beer so unless you're in an extreme spot just let nature take it's course.
I live in a late 19th century Victorian. I ferment in my basement bar which has hot water heating pipes running across the ceiling. It stays fairly temperate, though in the winter I use an inkbird and a heat belt to keep it warm enough. Great for lagers though.
I keep mine inside my homes airconditioned/heated space. Usually in a powder room off the laundry room that goes unused for it's intended purpose. So I have no trouble keeping my ales at 20C (69ish F).
I only brew and ferment about 10 litres at a time, and it's never been a issue for smells in the house. If ever smells were annoying, the powder room has an exhaust fan.
I brew in my garage that runs from freezing in the winter to 110 in the summer. I have a freezer plugged into an InkBird and a small reptile heating pad inside.
When it's warm (April thru November) I usually ferment in the house, using a Brewing Cooler and some Ice Shock freeze pads to keep temps around 65.
But when it's consistently cold (mid-November thru early April) I move the tank to the workbench in the garage, with a extra-wide heating pad strapped around the fermenter and an InkBird temp controller to keep the temps between 60 and 65.
Used to ferment in my shed outdoors. Last couple batches (that have been above-my-average), I've been using a swamp cooler in my spare room. I think that the consistent temp during the process (no surprise) has led to the vastly improved beer.
I brew and ferment in my basement year round. It is consistently around 55°F. I use a fermwrap heating wrap around my fermenters to keep the temps up when needed.
There are two fermenters under my table by the front door of the apartment. The apartment is heated in winter so that the temperature is around 22'C during the day and drops to 18'C at night. In summer it can be up to 30'C. However, I use a yeast that has a wide temperature range (15'C to 35'C, Belle Saison) so I have no temperature issues.
I had a small chest freezer I would use but after about 10 years it died this summer I did not brew all summer. Now that it is cooler I can ferment in my garage. I did two batches is weekend and I'll probably do another one real soon since I have 3 empty kegs.