Has anyone had any experience with a fossil fuel kit to use Nat. Gas for heat when it’s colder than 30 to 40 degrees and heat pump when warmer? An owner is considering it on a new house in the Mid Atlantic area.
Any thoughts?
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Doug,
I have a dual fuel heat pump-propane unit. I think it's cheaper than having electric back up. If you have a generator you can switch to propane and still have heat.
KK
I have a boiler that backs up the heat pump. It held down the electric bills, but the jury is out this winter due to the skyrocketing fuel costs. I wouldn't change it back, though, the heat from the boiler is hotter than a heat pump can put out, making the house seem more comfortable.