LEAFer wrote:And you did not mention what gauge wire this circuit is using. Given the sketchy description ... you should contact an alternate licensed electrician.
Adding to that you should ignore the suggestion to just swap the 30A breaker out for a 40A one, unless you are absolutely certain the gauge wire you have in the circuit is correct for 40 amps. Otherwise you're a fire waiting for a place to happen, and one for which your insurance will say "Oh, so sorry - your fault."
The breaker shouldn't be sized for the load you're expecting, it should be sized for the length and gauge (and a few other things, like type and routing) of the wire it's protecting. Yes you can put a 30A breaker on to wire that'll support 40A, but IMHO that just confuses things down the road if you (or anyone else) need to do future electrical work.
If you're not certain of what you're doing, get an electrician. The home you save may be your own...