The questions: - Has anyone used magnetic heating vent covers to stop heating a room or area of a house? - Do they work? - If so, do you have any recommendations on specific brands or things to look for or are they all pretty much the same? - Any other alternatives that would work better? The reason for the questions, if you're curious (yes the below is obvious, but this lets me waste more work time): So now winter is upon me and it's incredibly freezing cold outside. Today's high is supposed to be 54 F! Holy cow, that's colder than a witch's teat! Subarctic, even! Awright, I admit I'm a wimpy native Californian who'd die if exposed to temperatures that are even remotely chilly. To prevent said death I've turned on my furnace. The attic in my house is finished and heated, but I almost never go up there and would prefer not to spend money heating it up. I closed the vents up there, but there's still a significant amount of heated air whistling through. So I'd like something that would more effectively seal off the attic vents, but are not permanent. I formerly had my home office up there, and may make use of the space again. Thanks for your help! Edit for more detail: My vents are on the wall, so any vent cover would be fighting gravity.