Hello, welcome to SG. "lead paint .. a/c ducts" <-- lol wow some new ones to me.
I assume you are talking about Wi-Fi connectivity. There are many possibilities of why the issue exists, it is possible that it is your laptop Wi-Fi adapter, the router, or a combination of settings between them.
First step would be to determine if it is a wireless issue at all. It is hard to be specific without more information:
What is the maximum speed that your ISP advertises, what are you paying for?
What is the model of your modem/router/gateway?
If you have access to a client that can be connected directly via Ethernet cable to the modem/router, you can determine whether the problem is with the Wi-Fi connection, or the line your ISP provides.
Other than that, we have a number of articles on the main site about how to set your router, wireless adapter, etc. Here are a couple of them you can check
https://www.speedguide.net/articles/...imization-3449
https://www.speedguide.net/articles/...ed-tweaks-5681
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