Posted by 3000OH on March 22, 2017 at 16:34:08 from (166.137.102.33):
In Reply to: Re: Home heat pump posted by 4wdtom on March 22, 2017 at 00:17:26:
+1 on insulation. We built a superinsulated house. Friend who owns a large HVAC company (only commercial) wanted to do the install in our place. He really liked a heat pump/propane backup setup. After looking at it all, went with a propane-only / high-efficiency unit with AC add-on. Have been real happy with it. We keep it warm and we're using only 55-60% of the propane that a home this size usually uses. After 10 yrs, our propane company couldn't tweak its auto-order/auto-fill system to reflect what we actually use, so 2 yrs ago we went to a larger tank and get one fill/yr, in the summer when it's cheaper. As for AC, we use it so little - because the house stays so cool on its own - that it doesn't make any noticeable difference in the summer-vs-winter electric bills.
Why didn't we get a heat pump? Longevity & cost. From the specs that we had available back then, heat pump life was (understandably) just over half that of an AC unit. And, if we had to have a propane backup anyway (since elec is pretty expensive), why not just go with propane all the way?
Has worked well for us so far. No mech problems, only one problem of any kind - during a big snowstorm, the plastic coax intake/exhaust got a snowdrift over it and iced up and the furnace wouldn't start since it wasn't getting inducer air. 20 minutes of a shop vac hose running into the intake tube thawed it.
All of this was possible due to the high-R insulation and careful gap/crack filling we did.
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