I'm fishing and skiing every other week :)Good luck. 

My current set up:(1) Furnace (in unfinished basement) with shared duct work to both units (1) Water heater in basement used for both units(2) separate electrical boxes for each unitHeat/ gas bill shared Separate Cooking oil/ stove bill for 2nd floorNo ACThe thermostat / temperature control is only in the 1st unit so all the 2nd floor can do is open/ close its duct work----Seems like I have three options that i can think of.

@Alissa Warren I would try to fish in your own pond first. 

(I had to deal with a couple of fish tanks - that was a fun one!)

They had no problem sharing information when they knew I was a professional and here to stay, not just in town fishing around for information.  

Very Expensive.Home Inspection$667.00Termite Inspection$0.00 (Included in Home Inspection Fee)Radon Cannister Inspection$0.00 (Included in Home Inspection Fee)Oil Tank Sweep$250.00Home Appraisal Fee$575.00Survey$0.00 (I made the sellers do this.

Sellers mentioned the unit had an above ground oil tank that was removed and there is visible signs in the basement of plumbing for an oil tank.

If you have a section or more, you have those same farmers plus maybe 5-10 “big fish in the small pond” farmers who would be interested. 

I'm not sure Houston is the best area to buy right now with the oil prices where they are currently.

Unfortunately, the old oil tank is still in the basement and has a small leak.