Mold is caused by the entire system not being dried out by A/C not running long enough. A/c installers try to get you to move up to a bigger unit than you actually need sometimes causing the problem because it runs less time to cool the house. Best sizing is exactly what you need or slightly smaller. Install a setback thermostat if you don't have one. That way you have at least one long cycle when it changes from daytime to nighttime. I had a new internet capable thermostat installed which monitors humidity and kicks on A/C to dehumidify the house. We are snowbirds and can remotely check on temp and humidity and change settings if necessary.
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