they said they were calling about cleaning the ducts in the house but when I wanted further information they hung up on me.  Think it's a scam

They called my house and hung up when I answered. If it is a scam then it would be pretty hard to scam money from me without actually talking to me.

Question: What do crooks like more than money? Answer: Something that is worth money, that can be sold more than once. Your phone rings, you answer. A computer logs your number as live, & active. It's put on a list, & sold to other crooks. Simple as that, with zero penalty for the criminal that is doing it. After all, would the FBI arrest someone for hanging up on you?

This person called and spoke with my daughter, kept talking to her, but would not speak to me. When I went to speak they hanged up. I'm in Ontario, what can I do?

This happened to us as well. Man with an accent, called and asked my daughter a ton of questions. Made her feel quite uncomfortable. The next day the number was out of service. My advice would be to report it to the police. We did. There is also a report of this again in the Ingersol area too.