This would also allow me to keep my primary at a low rate loan. 

Make sure you have filed for Homestead exemption at the very least (this can only be done if you the home is your primary residence, not an investment home).

You're essentially doing the same type of strategy except you're not putting your precious primary home at risk.

I am heavily invested in index funds and long-term stock investments which is my primary focus and something I adore and am extremely interested in.

But true my wealth primary have comes from something less glamorous: boring real estate.What's "boring"?

Although insulating the floor is a nice extra, it is not the primary way that cold gets into the house.

My primary business is owning a wealth management company, and is where I enjoy spending my time.

There's a few different ways to focus on a lower rate such as with house hacking and making the investment your primary residence, requesting a significant closing credit from the sellers for standard rate buy-downs (which I've had great success with recently), or utilizing lenders who offer short term rate lowering solutions such as 2-1 rate buy downs (again, ideally paid for by the sellers).

@Elizabeth Lebit's either house hacking (if you're looking to buy / live in a new primary) or nothing.it's not enough to do anything else.

Quote from @Nicholas Dillon: Hey guys,I own 2 LTR properties, plus my primary home that I rent out half of the year while I live in Indonesia with my wife, who is Indonesian.