I tried to clean ours in previous home could only reach few feet down the ducts. Using flexible vacuum cleaner. Gave up and called professionals.
Had my ducts clean in our previous home before we sold it. They had big suction truck and used rubber ball on rope ( our something similar?) turned the machine on and let the ball bounce around in the duct releasing it down the duct knocking most the dust loose. Done it from both ends. Course that was in older house and state. IMO this area less weather intrusion than other states. IMO if you’re home over 10 or 15 years old may be helpful? I notice when people get A/C heat units replaced the contractor don’t do no duct cleaning, just throw new unit in.
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