It is indeed a hybrid system...air heat pump/furnace that runs on
electricity in temperate or hot conditions, propane backup when it is
too cold outside to extract heat.
Your buddy in Florida is a moron.
Heat pumps are not that popular here except as pool heaters.
We have resistive electric heat but it really never gets used. I don't
think the strips in the central system have been on in 2 years.
The concept of a gas furnace is not even understood by people who have
lived here all their life.
When we put our pool in I looked at propane versus heat pump (reverse
cycle A/C) and went for the heat pump. In this part of the country
trying to heat the pool too early is a waste of time unless you have
a good thermal cover for the pool (which are a pain in the ass).
If I start warming up the pool water too early in the season there will
be a fog over the pool in the mornings when the air temperature is below
the water temp. It's like watching $$ evaporating out of the pool.
We use it from late June, early July to raise the temp up to about 82-84
degrees and from there the water will stay fairly warm throughout
the summer. We also use it to extend the season a bit but don't run it
that much. It's a 150K BTU unit and it's not exactly cheap to run but
is still less expensive than propane.
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