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Old 02-14-2010, 09:32 PM   #1
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Electricty bill doubled... Heat pump?


I have a fairly new home (2.5 years old) that has a Carrier heat pump installed. I have historically had electricity usage of 40 - 50 kWh/day during the winter months, however the last 2 months it has been around 110 kWh/day. I suspect it is the heat pump causing the issue as I have checked my meter readings prior to leaving for 2.5 weeks, and while I was gone basically the only two things running were the water heater and the heat pump, and have still been using around 100 kWh/day. The house is heated fine, and other than the outrageous bills there are no apparent problems. Is there anything I can check out myself? I live in central ON, and it's fairly cold. But again, the last two winters, and even the beginning of this one, there were no issues. Thanks!

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Old 02-14-2010, 09:46 PM   #2
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Electricty bill doubled... Heat pump?


Where are you located ?

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Old 02-14-2010, 10:03 PM   #3
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Electricty bill doubled... Heat pump?


Central Ontario.
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Old 02-14-2010, 10:07 PM   #4
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Electricty bill doubled... Heat pump?


Ontario. pretty cold.

How often do you change your air filters.
You may have a problem with your heat pump causing the aux heat to come on sooner and longer then it use to.
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Old 02-14-2010, 10:27 PM   #5
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Electricty bill doubled... Heat pump?


Air filters get changed every 6 months. When the house was built the tech told me they were good for a full year but that seemed a little long to me... My thermostat tells me when the Aux Heat comes on, that was my first thought, but it doesn't seem to be coming on. I've been checking for that...
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Old 02-14-2010, 10:41 PM   #6
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Electricty bill doubled... Heat pump?


Could be a problem with the heat pump going into defrost too often. Your stat may or may not indicate aux heat when the heat pump goes into defrost.

6 months sometimes 8 months on 4" and better media air filters. After that, many of them become too restrictive.

Do you have 1 or 2 breakers on your air handler?
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Old 02-14-2010, 10:55 PM   #7
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Electricty bill doubled... Heat pump?


Yeah it uses 4" filters. Since you mentioned the defrost mode... I haven't ever seen that come up on the stat display, so you're right, it most likely doesn't notify me. When you say 'air handler' do you mean the outdoor unit?
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Old 02-14-2010, 10:58 PM   #8
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Electricty bill doubled... Heat pump?


No, the indoor unit.
Its called an air handler.
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Old 02-14-2010, 11:08 PM   #9
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Electricty bill doubled... Heat pump?


do you have electric heat strips in your air handler or is it a gas furnace for backup heat?
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Old 02-14-2010, 11:10 PM   #10
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Electricty bill doubled... Heat pump?


Sorry I'm a little confused.... Outside I have the heat pump/AC unit. Inside I have the furnace and the HRV. I'm a rookie at best when it comes to this stuff, so which are you referring to when you say 'air handler". Again... I apologize. For breakers though... the heat pump/AC it on a 2-pole 30A breaker (It runs on 220V)... I'm assuming the HRV is tired into that as well. There's also a 'block' outside. Doesn't look like a breaker, just a module you can remove. As far as the AUX heat goes... it's electric heat strips. No natural gas available on my street.
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Old 02-14-2010, 11:16 PM   #11
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Electricty bill doubled... Heat pump?


Your indoor unit is a n air handler.
They are also at times referred to as furnaces(electric furnace).
Although all electric furnaces are air handlers, not all air handlers are electric furnaces.

You probably have more breakers in your panel box. That are for the inside unit.

Is your HRV running 24/7, or on a timer or other control that it doesn't run 24/7.
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Old 02-14-2010, 11:31 PM   #12
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Electricty bill doubled... Heat pump?


It has three settings... OFF/Intermittent/ON as well as a humidity dial. I have it set to Intermittent with a relative humidity of 40%. It has two lights on it, 'Air Exchanger' and 'On'. The 'On' light is on all the time, and the 'Air Exchanger' comes on and off (I'm assuming as the HRV adjusts the humidity).

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Old 02-14-2010, 11:40 PM   #13
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Electricty bill doubled... Heat pump?


Ok. It doubtful that your have 40% RH in your house. So the ERV shouldn't be causing the problem.

I would check to make sure its not running when it shouldn't be though.

Have you started to set back the stat when your away or in bed. When you didn't in the previous years?
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Old 02-14-2010, 11:48 PM   #14
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Electricty bill doubled... Heat pump?


No, I haven't changed anything. Does the HRV draw enough power that it potentially could be causing the problem? To me it doesn't seem like a high consumption item, even if it was running too often.

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Old 02-14-2010, 11:53 PM   #15
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Electricty bill doubled... Heat pump?


Its not the power it draws.
But if it ran continuous. The amount of air brought in would have to be heated(its not 100% efficient. So however much air it brings in, it adds heating load to the heat pump. And that would take more running of the heat pump.

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