When does it happen? Does it happen at the start of the ignition of the heater, or in the middle of the heat cycle?
as soon as heat begins to come out vents
What you are smelling is when the igniter glow coil or spark igniter comes on the gas valve opens to allow the burners to ignite. It is not uncommon to smell this gas at first. But I would advise you to have a technician check your igniter to make sure it is working properly.
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Well I guess my follow up would be I never smelled gas anytime before this past spring but now smell it daily so this was not common to our house. So something must have broke or is in the process of breaking.. I would have thought the hvac guy would have noticed a spark igniter if there was a problem or is this something he could have missed
The spark igniter could be , for lack of a better word, partially working. It may have a delay that is allowing more gas to come out of the gas valve before the burners catch on.
The HVAC guy could have easily missed this.
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