It's great to hear about your real estate investment journey and your plans to expand in Houston.

I took out a $50,000 HELOC @ 8% Interest from my Primary residence in Colorado Springs, before I began to rent it out, I had no idea at the time my parents planned to move. 

Still running the numbers, but the plan is to BRRRR but flip would be the backup exit strategy.Does anyone have experience installing HVAC in old houses that do not have central air?

I plan to use this home as a long term rental.

Do you plan to use the property at all, and STR it, or just buy and long-term rent it out?

Don't be afraid to spend a good amount of time vetting them and getting quotes. 

You just need a plan to pay it off. 

However, I work in the oilfield and spend most of my time in Odessa Texas, at an apartment that I am renting.

While you're at it, you might also want to explore some resources on financial planning.

I do not want spend my W2 income to cover house mortgages, to not have pressure if things like layoffs will happen, so my plan is to buy house in a good neighborhood that may have appreciation and some minimal cash flow after all expenses (management, maintenance and vacation).