re: Is mortgage refinancing worth looking into for me?

I am looking into refinance now also as I finished building our house last year. At the time rates were up alot so I am in a 30 year at 5%. I called Lending Tree because I see the ads all over and they have Quicken/Rocket call but they are still saying best rate is 4.3% when I see discussion of everyone getting under 4%? Does anyone have suggestions on companies to call? I have 800 credit and 150k equity in the house also.