I have owned gas powered furnaces since 1978 and one 5,000 s/f house with two of them (these required a filter replacement and would stop working if they got dirty). When I inquired about any work necessary when owing the first house I was told there was nothing to do except replace or clean the air filter depending on type Pleated or dissimilar metals which are washed periodically.
Therefore nothing is required such as an oil furnace. Also oil is dirty and the house will be cleaner when using gas. My in laws had oil and scoffed when I told them this. I told them the dust in the house would be white. Then a time came when they rented a gas conversion, free installation by gas company.
They were surprised when the dust was white and the furniture was did not feel oily. I digress, but unless something has changed nothing needs to be done with a gas furnace. Do not know about LP however.
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I am a retired workaholic and continuing aquaholic
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