You can get bulbs designed for the coil, but their function is going to be to keep the coil clean and mutate anything that gets trapped on the coil. Air stream bulbs should have some sort of collector plate, like carbon, that will attract bacteria, viruses, etc and hold them so the bulb can do its job. For air quality (purification), I would put one of these in the return first. For clean coils and efficiency I would put one inside the A coil. Best case scenario, one of each with an IQ Air installed for top of the line filtration and purification.
Does anyone have any suggestions on which uv bulbs to carry? Still trying to feel this one out.