If you are facing a prolonged power outage, the obvious answer is a generator, for which you can prioritize a pump, even an ordinary air pump with bubbler; return pump if you've got the power; and lights if you've got corals: they can take 3-4 days in the dark with no problems, but 5-7 is getting iffy.
Cold is not a problem as long as the tank does not get below 62 degree. Cooler water holds and retains more oxygen, which is a good thing.
Granted you're going to lose the ac, HEAT could become a problem. Don't let the tank get above 85 degrees, and in the dark, 85 is not a problem. 85 under bright lights can be.
Keep a bottle of Prime on hand: if you have deaths, you'll have ammonia, and Prime converts it so it's not harmful.
If you lose all circulation, you can take a gallon pitcher and climb on a chair, dip and pour a gallon for every gallon in your system. Yep, pour it from as much height as you can, driving oxy bubbles into your water, and keep it up. It'll be good for 4 hours after that. I managed a hundred gallong tank for 8 days this way, and yes, you get up and do it at night, too.
If you get some Penn-Plax battery driven air pumps (Petco, etc) you may be able to spare yourself that. Stores sell out fast in a crisis.
Hope that helps, and good luck!
Cold is not a problem as long as the tank does not get below 62 degree. Cooler water holds and retains more oxygen, which is a good thing.
Granted you're going to lose the ac, HEAT could become a problem. Don't let the tank get above 85 degrees, and in the dark, 85 is not a problem. 85 under bright lights can be.
Keep a bottle of Prime on hand: if you have deaths, you'll have ammonia, and Prime converts it so it's not harmful.
If you lose all circulation, you can take a gallon pitcher and climb on a chair, dip and pour a gallon for every gallon in your system. Yep, pour it from as much height as you can, driving oxy bubbles into your water, and keep it up. It'll be good for 4 hours after that. I managed a hundred gallong tank for 8 days this way, and yes, you get up and do it at night, too.
If you get some Penn-Plax battery driven air pumps (Petco, etc) you may be able to spare yourself that. Stores sell out fast in a crisis.
Hope that helps, and good luck!