Furnace tuneup
I have my furnace cleaned every late-summer by the company I buy my oil from. Do I have all my eggs in one basket - yes, is it working out - yes. I have been with the same oil company for almost 20 years, and have had no problems. In my thinking, considering that the winter nights can get pretty cold, I want to have an excellent relationship with my heating company in case anything ever did happen and I needed them in the middle of some cold night.
Am I concerned about the "cleaning guy" oversizing the burner nozzle so I use more fuel - no, not at all. At some point you have to trust people who do work for you, otherwise you will end up a paranoid basket case.
So, the answer to your question is - call your fuel supplier and ask if they provide cleaning services, or, if not, do they have someone they trust that they can suggest to you.
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