As for coffee, we go for simple solutions... like a stove top percolator, or even easier are the Starbucks VIA powdered coffee packets.. Just add boiling water and you're set.. cheap and simple. All you need is a kettle.
Others have covered the AC topic to death..
True Catalytic heaters (like the Wave) do not produce very much CO.. why does this keep coming up?
The risk in using them is Oxygen deprivation.
The OP must be talking about Infrared radiant heaters, like the Mr Heater Buddy.