Isn't it the other way around... AFAIK water makes a good insulator and
will hold temperature for a while, but the gas exchange should be kept
up. Here's a thought (more like another question) as the temperature
starts to drop, wouldn't the fish, being exothermic, slow down in
activity requiring less oxygen? Plus colder water holds more oxygen?
Plus CO2 buildup makes fish sleepy? Or am I just justifying spending my
emergency funds on snacks?

You could try scouring the pages of Ebay for a UPS (Uninteruptable
power supply) This would take out power surges/spikes and give you
power for a time depending on what size you go for. I would use it only
for heater/stat as filters and air pumps are generally not required
desprately for a short time. Depending on your setup of course?

Steve


--
papalulu