There are two factors I can think of that you should be aware of.
1. Propane is heavier than air. Unlike natural gas that is lighter and
tends to dissipate quickly; propane tends to pool in the basement and can be
more dangerous. You want to be sure to have a detector in use and be extra
careful. I don't want to say it is un-safe, but the differences can make it
less safe if you are not aware of them.
2. Price! Compare price on a per thermal bases to figure out any cost
of operation issues.
$$$$ (You better have lots of them...).
Of course, depending on where you are, natural gas may not be <that>
much cheaper, but better check carefully on what local relative costs
are and relative usages as that may give some clues as to looking
I wouldn't turn the house down on that basis alone, but I'd not select
it as my first choice in most locations. While it's common here in
gas-producing country where there isn't NG distribution and we used it
for tractor fuel in the 60s-80s, I just don't like having the tank as
part of a residential setting unless it's the only practical choice.
Of course, if we didn't have a major pipeline running through the
pasture close enough to the house to have a tap, we'd be on LP, too...
No problems with it, except if you have a 90%+ furnace, don't let the tank
run out. Propane at low pressure can sot up a furnace pretty bad. It can
completely plug up a secondary heat exchanger.
Price wise it varies with what is popular and available. In our area usage
prices seem to run electric, oil, propane the natural gas as far as cost. In
some areas you can get pretty cheap electric rates for heat so sometimes
electric is the way to go.
The efficiency of that choice will depend heavily on the location and
type/quality of the heat pump. If OP's in a really fridgid location, an
air-exchange heat pump may well run on the backup heat most of the
time. A ground exchange system might solve that but would be more
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