You might want to try an ozone generator to get rid of the musty smell. We're snowbirds and have had trouble with a musty smell in our house up north when returning after being away for a while. For the past couple of years we've been using an ozone generator that we bought on Amazon for about $70 to zap the house when we return, and every now and then to just freshen up the place. We let it run for an hour or so with the heating system fan running while we're out of the house running errands. When we return, we open a few windows and take a walk or do more errands for a while. You don't want to be in the house with it running and until it airs out. The ozone can damage your lungs. But, it's done a great job in getting rid of the musty smell, which I think might be coming from the air ducts.
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