Customer says periodically she has a very corroded smell that she smells in the air in a particular area of the home. Did a walk-through with customer and adjusted the humidity level from 65 to 55% on the downstairs thermostat. Customer changed it on her upstairs thermostat. She does not notice any difference in cooling, doesn’t notice the system struggling to cool on either upstairs or downstairs unit. My Professional opinion is that there is nothing wrong with either air conditioning system. She lives on the water and it is quite possible that a lizard or something small got inside and maybe have perished. When the air conditioning system is running it’s pushing air through the home so maybe every once in a while she catches a wiff of the smell. Both thermostats have achieved temperatures that were set. Customer will call us if there are any cooling or heating issues. Both systems are cooling properly at this time.