What are the preventive measures you are taking to make HVAC less of an issues?

That's what you have to ask yourself.You should order a copy of Frank Gallinelli's book, "What Every Real Estate Investor Needs to Know About Cash Flow...and 36 Other Key Financial Measures." 

They mainly take measurements, photos, and make note of different features that might affect the price.

To be certain, forensic cost segregation studies will be an extremely important measure to consider applying to your next acquisition or construction project.Questions?

I measured relative humidity, last time it was 56% (a little high), this time it was normal (40%).

Well simple.How much work is needed to do this successfully.What is the probability of you doing all that work, and what is the effectiveness of social media vs DMM vs cold calling, vs...Now you know which method works better measured against your taste, effort level , knowledge level and dedication to work on it.NO you are not done.

My favorite personal measure is revenue / cost of property.

So when you are doing your math you will need to measure value against sold comps.  

Or can you obtain it without extra costs- What is the competition like for that position and how do you measure up? 

The state has allowed you to pay a tax to get government sanctioned liability protection.