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Personally I'm looking into a ground exchange heat exchanger. I like that it works regardless of heat pump mode or AC. But from my research they are around $20k installed

We did try running dry in normal fuel, we still got junk precipitating out in the tank and carb. Are you going through more than 100 gallons a year in your small engines? If not I think the $0.40 a gallon more in fuel is a negligible increase in cost for peace of mind. I mean I don't know...

+1 for no ethanol fuel. I have had several co-workers come to me with small engine machines like pressure washers and snow blowers saying they wouldn't start after sitting for 6 months or more. Every time it was the fuel had precipitated into some white slimy substance and clogged up the carb...