I live in Ohio. I have a duel-fuel system, heat-pump and gas furnace.
I want to know how to get the best energy-efficiency out of the system.
Do I turn off the heat pump and only use gas furnace when the
temperature falls below a certain degree? Is is best to leave the
thermostat at a constant temperature or should I buy a programmable
thermostat to turn down the heat at night? Are there any specific ways
to use the system for the best performance? I have heard many
differing opinions and just need some clarification.
That is what the Yuppies now call a hybrid unit. The saving for your area
are only in the fall and spring....winter brings the secondary heat on a
majority of the time.Some of the newer digital t-stats have the ability to
shut down the ht pump and only run the secondary heat at a set temp
I never liked the engineers reason for leaving it on. The wattage usage to
the BTU gain...and then they get the slide rule out while smoking their
not enough for me to leave it on....bring on the fossil fuel
Im going to disagree. A properly sized heat pump in the Ohio Valley
area does very well in winter. I have one. Last year at 7 degrees
outside several times I still had mine running. Yes, it runs a lot
more and no its not able to bring the temp up but it does a good job
of maintaining temp. The gas heat does come on but not all that
noticeable. Your gas useage goes down but the electric jumps up. It
saves money at current rates but not enough to go purchase that new
car or boat. :-)
You *DO NOT* want to run both the heat pump and gas furnace at the same
time. You run the heat pump down to about 35 degrees, then heat pump is
taken out of the loop, and the furnace comes on line.
Think about *WHY* you don't want both to run at the same time......
(HINT Think "head pressure")
35 degrees is too generalized. I had a heat pump today on a
"tune-em-up". Outdoor thermostat was shutting the heat pump off at 35
degrees. That was the temperature today so the heat pump wouldnt run.
I turned the stat down to 25 degrees. Went in and watched the heat
pump run. I had 98 degrees just out of the plenum. I'll run em down to
25 degrees outside anyday.
as i said above, i wouldnt run both.......but ive seen it done by folks
supposedly smarter than me.
personally i wouldnt run it down that far, but im not anal about trying to
squeeze every possible btu out of a penny. id rather be comfortable, and
prefer to run a furnace at 40 or below. still, ive seen some that run the
heat pump down to around 20 degrees.
again see my initial response above, i wouldnt ever recommend running
both......just that ive seen it done.
Nathan in Montana
im sorry (my wife is from ohio, and having been there myself its the only
thing that comes to mind ;-)
let your t-stat control it.
doesnt your t-stat manage that via remote outdoor sensor? if it doesnt, get
one that does. honeywell makes a nice touch screen programmable, but i dont
have the part number handy.
i dont use a programmable t-stat. when its to cold i turn the heat up, when
its to hot i turn on the a/c. for the most part i leave my honeywell set on
auto, with the heat set to come on at 72 and the a/c to come on at 75. in
general i set it and forget it. why would you turn down the heat at
night.....isnt that when youre typically home?
Nathan in Montana
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