I have been getting the call from this # but when I answer but there is no answer from the other side. I tried calling back the # but it says that the # doesn't exist. I can't tell if this is some kind of fraud or tele marketing.

I answered and no response , after about 5 seconds heard a hang up. I called the number back and it is a number not in service.

Add me to the list, didn't leave a message and says "Kirkland, WA" on caller id.  Almost always when it says a city or out of area it's been spammers.

Guy called representing the air duct company.

has called a few times now usually just hangs up when i answer this time someone asked for the home owner then hung up on me before i could answer. Always says from Kirkland on caller ID