Small temp swings or set heater higher?

[lastlight]

Been getting up to 25 degrees in my livingroom and today the tank (which had been going no higher than 80) is sitting at 82.

I'm hoping it won't get any warmer than 82 but here's my question:

What's better for the tank inhabitants:

- let the tank swing between 80 and 82?
- set the temp to 82 so there is no swings (ideally)

Please share your thoughts thx.