DON’T use lendingtree or an online shopping service like that! They could run your credit several dozen times and potentially damage your FICO scores.
I am not going to comment on lending tree becasue I have never used them. My understaning of credit is that you have free rain to shop for credit provided you are doing it within a 2 week period of time. That means I can go to 10 different dealerships and have each run my credit and the crediting agencies will recognize this as 1 item of credit that I am searching for. I would think this would hold true for mortgages aswell. If lendingt tree is going to send my credit out to be run let them do so provided it is done within that 2 week period
A more detrimental scenario would be having my credit run 1 a month jsut to see what I can get. This on the other hand would have an adverse effect on my credit.