Hi @Charlene Stovin.
People take out HMLs to purchase, rehab or refinance. Carrying a short term HML loan is generally expensive - e.g. the interest rates might be 10%+ interest only, so it's like a cold shower, you get in and do what you need to do as soon as possible and then get out.
When you get into a short term HML you need an exit strategy. E.g. fix the property and refinance or sell the property and pay off the loan.
Refinancing usually means a conventional loan. E.g. a bank. Banks offer much better interest rates than HMLs. However a Bank might not lend to you for a purchase or might not do rehab or the property might not quality or they might take too long to close for that purchase you are contemplating. That is why many people use HMLs to do what they need to do and then refinance at a better rate once they can.
There are also some Hard Money Lenders such as ourselves who offer refinance into our 30 year, fixed, fully amortized HML. However while the interest rates are less than a short term, hard money loan, it is still more expensive than a bank and indeed does not pretend to compete with conventional loans.
If you don't have 20% down then my guess is that you are not ready for a HML. HML is convenient but not cheap. You will still need a down-payment (probably 10%-35% of the purchase), you will still need loan closing costs (say $6K-8K), you will still need money to carry the loan until you can exit the loan, you may still need money to rehab (at least to the first draw milestone) if you are rehabbing and you still need money for contingency in case things not quite as planned.
Hope this helps.