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The defrost setting is really for fog on the windshield and side windows. A/C is activated because the A/C can very quickly remove moisture from the car in the car which is what causes the fog in the first place.
If you don't actually have an A/C button to deactivate the compressor while you are trying to de-ice your windshield, then just turn the heat setting to full hot and it will still blow out hot air. On some modern cars you don't have a choice as to whether your A/C compressor gets selected or not. On my older Civic it automatically turns on but I can manually hit the A/C button and turn it off if it's winter and I am de-icing the windshield.
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