Apparently bed bug treatment takes quite awhile (you can tent an entire property for termites faster than treating for bed bugs).  

With the deferred revenue rules currently in place, for a flip you could potentially delay recognition for up to a year, but you don't get anywhere near as good as treatment as you do with the installment method.

If this is a well, good chance you might have bad water quality and will need water treatment.  

Either way, $6k is more than the de minimis safe harbor of $2.5kMaybe favorable treatment under the small taxpayer safe harbor. 

Repayment of principal is merely a balance sheet movement that never hits the P&L.Your accountant should look to what was done with the proceeds over time to determine accounting treatment as well as interest tax treatment. 

The question is, assuming I go for the heat treatment, will the entire house need to be treated? 

I had NEVER had a panic attack until I went through treatment for cancer.

The fogger has good reviews, what's the hurt in trying it before an expensive exterminator treatment?

Considering the property has equity, dealing with directly and only you, could subject the trustee to claims of preferential treatment.

@Greg Grant  one of the most lucrative tax treatments in the US is the sale of a primary residence and 250 k for a single owner and 500k for a married owner are tax FREE no tax due . so for you 160k would not be taxed..