Sure, heat tape will raise ambient temperatures a bit. Is it the most efficient way to do so? No, otherwise it would be more difficult than it is to create a temperature gradient within an enclosure. But, yes, it does have an effect on ambient temperatures.
In a temperature controlled room with enclosures that retain heat well, like Brian's, heat tape alone is relatively effective in raising ambient temps a few degrees to where they should be for our animals. However, if the temperature of the room drops too much below that, additional heat sources are typically recommended - especially with enclosures that don't retain heat as well.
It should probably go without saying, but regardless of which size heat tape you choose, OP, make sure you're running it through a thermostat to keep it from heating the bottom of your enclosure too much. I'm sure you're already well aware of that though.
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