They put odorant in gas to detect leaks(rotten egg smell), you can pinpoint leaks by using a combustible gas indicator and soapy water.I wish we have gas service in our prop in Houston.

They might help you pinpoint the leak, they usually have combustible gas indicators.

I did reach out a hvac company that offer tune ups for winter and summer , the technician who conducted the tuneups seemed inexperienced ,all he did was dusted off the furnace, punctured the aluminum tube near furnace for "combustion test" when I brought up no airflow from one of the air registers he suggested the only sure way to address the issue is by ripping the ceiling off and checking the tube for any holes.

Better protection is an arc-fault breaker, because arcing from missing insulation is one of the dangers of K&T.As for insulating, obviously anything that looks like it is loose or coming apart I would re-wrap with good quality electrical tape (electricity off, of course, when you do this) but beyond that you want to keep combustibles away from the wiring. 

If they rusted out, the carbon monoxide and other combustion fumes will get into the airflow and poison people. 

Money and friends can be a combustible relationship.

The 2001 recession in the dot-com bust, home values continued to rise.

The primary air vent going outside preferred because Highefficent furnaces are sealed combustion.

One significant exception is during the dot-com bust in 2001; for example, San Franciso reported large vacancies and rent decline.

A gas-burning water heater shall not be located in any bathroom, toilet room, bedroom or other occupied room normally kept closed, unless adequate combustion air is provided.