As I've said a few times, Lisa has been coughing and sneezing a lot ever since we got back from Tonopah. We initially chalked it up to dust and pollen being blown around by high winds, but she only got slightly better. She decided to do a fairly thorough cleaning of her travel trailer, where she spends a lot of her time. Yesterday, she tackled trying to clean the trailer's furnace. This was the primary air filter on the furnace's intake. There was, she said, a whole lot more dust than that clogging up the furnace. She vacuumed it out as best she could, cleaned the dust out, sprayed Lysol around, installed a new filter, and then also taped another filter over the intake for good measure. She then tossed the clogged filter outside. In theory this could be cleaned, but she told me to not bother and to just toss it in the trash. We can buy more filters. According to Lisa, she's breathing more easily already.