In late February I had an intermittent furnace problem. It would light most times but every other day or so, it wouldn't light. I'd be sitting in my chair and would notice I was getting cold. Flipping the power switch on the outside of the furnace housing would reset it and it would work again. Being in Minnesota, this is a problem. I tried to fix it myself (flame sensor, hot ignitor plate, pressure switch, etc.) but the problem persisted. I believe I narrowed it down to a natural gas problem. I'm not messin' with the gas supply, time to call the pros. I was careful to write down when the guy showed up, what he did, and when he left. I was told I needed a new gas regulator. This is the one that is on the natural gas supply line just before the gas line tees off to the furnace and the water heater. It is located in our furnace room right next to the furnace. The regulator valve was replaced. I asked, "What do I owe you?" and was told an approximate amount and that I would get a bill. The furnace worked great for a couple of days, but it was back to the same symptoms. Another call and another tech comes out to the house. This time I am told the furnace burners need to be replaced. This was done and once again I ask what I owe. "You'll get a bill." The furnace is now fixed. A week or so goes by and no bill. I wait another couple of days, and call them about it. I am told that they are aware of it, that they will talk to the techs, get their workflow information and I'll get a bill. This was March 8th. So here it is April 2nd and still no bill. After asking about the charges three times, including calling them after the fact, I'm thinking I'm not supposed to have to pay for this. Thoughts?