Using HELOC to fund flip deals??

[Ki Lee]

Hello, newbie to the site here.  

Quick question in regards to funding flips.

Instead of using hard money lender with high interest rates, I'm considering taking our HELOC from my primary residence to fund my flip project to enjoy much lower interest rate and longer term where I don't have to pay back right away and can use the money to fund future deals.

Are there any good reasons to NOT take this approach and opt for a hard money lender instead?  Thanks in advance.