The single package HVAC units might be your best bet since they can be all electric/heat pump but you'd still have to install the ductwork, but it is very high end and takes very little space.

My guess is they could be international investors that need to park their money somewhere stable or people betting on further appreciation?

I'd bet on you and people like you who have that type of focus and commitment all day long. 

Unfortunately, going in person is by far the best bet, but I know how inconvenient it can be.  

I’d bet on my abilities any day over leaving my money with Wall Street to handle.

I bet San Antonion is booming with so many people moving to Texas.

I bet there are government loans out there for this.So what if you bought an entire block of apartment buildings, filled with section 8.

This may be your best bet.

Some people hedge their bets, and go 50/50 fixed/variable (or some other ratio according to their best gambling/research beliefs, but then focus on paying one down quicker than the other once rates actually change). 

Soon is defined as 5 years or less.So assuming that’s the case your best bet will be high yield savings account (ally bank is around 1.75 percent I think) or a money market account