Quiet and Effective, With One Big Design Flaw

I bought two of these fans a few years ago, and overall, they have worked really well for me. I put one in my living room window and one in my bedroom window during the summer. Both windows are on the shaded side of my house, which is also the ocean-facing side, and I feel like that definitely helps them bring in cooler air. One thing I really like is that they are surprisingly quiet, especially considering how much air they move. The one in my bedroom doesn't bother me at night, which is a big plus. I also like that you can set a temperature and let the fan adjust itself based on the temperature. That feature is really convenient. Although, I do sometimes wonder whether the fan is sensing the outside temperature more than the inside temperature. There have been times when the fan isn't running even though the room feels pretty warm, while it's noticeably cooler outside. The foam-style inserts are convenient for filling the space on either side of the fan, although they don't fit my windows perfectly. I have pretty standard-sized windows, so I was a little surprised by that. Every year, once the worst of the summer heat is over, I take both fans out and store them in my garage until the following summer. My biggest issue is cleaning. Since these fans are constantly pulling outside air into the house, it's not surprising that they get pretty dirty inside. What does concern me is the combination of dust and humidity and the possibility of some general ickiness building up inside the fan and then being blown into my house. Unfortunately, the fan isn't particularly easy to take apart and clean thoroughly. I've actually considered replacing my current fans with new ones simply because they've gotten so dirty inside. But then I think, what's that really going to accomplish? The new ones are eventually going to get dirty too, and I'll be right back where I started. So overall, I really like how these fans work and have been happy with their performance. They're quiet, convenient, and do a good job bringing cooler outside air into my house. I just wish Vornado had designed them to be much easier to disassemble and clean. For me, that's the biggest drawback and the reason I'm hesitant to simply replace my existing ones with new ones.