@Brian Liscio   B-I-N-G-O.

If you already have natural gas (NG) piped to the home then just replace the current system.

We had a dirty PITA wood burning fireplace with a gas starter nozzle so I converted it to a nice Napoleon NG insert & it has been great.

But I attend them yearly.I download all the 118,000 parcels from the county website in a Shapefile format, get their long/lat coordinates and then cross reference with the tax sale properties.  

The current system will need repairs and was not sure if it just be better to convert to propane as NG does not seem to be an option anytime soon.

@Sam Ng I do believe that @Frank Wong makes some really great points here.

I was in a similar situation lats year.

Your basic smoke/CO detectors will not detect a NG leak you will need the explosive gas detector units 'First Alert' has one.The one I useUEi Test Instruments CD100A Combustible Gas Leak Detector.

There's a NG line that runs by the house that we could tap into so we'd like to pick your brain about options that worked for you if you had to deal with this.   

It's set about 300 feet back from the natural gas line on the street, and it order to bring NG in it'd be $7K to jus run a line to the house on top of the NG furnace conversion - ouch!