Bryant air conditioner runs but there is a musty or moldy smell from the vents when cooling.

Safety first: Turn off power to the indoor unit before opening panels. Wear gloves and a mask when dealing with mold or mildew.

Steps:

• 1. Inspect coil and pan: Remove the access panel and look for visible mold or slime on the Bryant evaporator coil and drain pan.
• 2. Clean drain pan: Wipe out sludge and standing water. Flush the drain line as described in the condensate clog entry.
• 3. Coil cleaning: Use a non-acidic, no-rinse evaporator coil cleaner approved for aluminum/copper coils. Follow product instructions carefully.
• 4. Improve filtration: Install a quality filter and replace it regularly to reduce organic buildup.
• 5. Consider UV treatment: Ask an HVAC professional about installing a UV light near the coil to inhibit biological growth.