Microwaves work by exciting the molecules within the food. To use it for heating, you will probably need some medium to absorb the radiation then transfer it to the air. If you have water coming in to your system, you could use a microwave to heat that. Magnetrons are about 64% efficient, but you could recoup some (all?) of the loss by mounting the magnetron in the air stream if it's a forced-air unit. IMO, it would probably be more trouble than it's worth.
Last edited by Patrick; 11-18-11 at 09:39 AM..
Reason: added info
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