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Old 10-03-2010, 12:17 PM   #16
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Opinion: Electric WH w/ Heat Exchanger


Yah, perhaps you need to change the balance point where the heat pumps shuts down and goes to aux heat. And get a tstat like Beenthere says that shuts off the heat pump and goes to straight elec strips.

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Old 10-03-2010, 12:28 PM   #17
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Opinion: Electric WH w/ Heat Exchanger


An IAQ can be set up to satisfy the heat call and shut both the strips and heat pump off.
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Old 10-03-2010, 12:59 PM   #18
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Opinion: Electric WH w/ Heat Exchanger


Upstairs unit is a Lennox elite 13 SEER, 3 ton unit. Basement unit is a Lennox Elite 15 SEER, 3.5 ton unit The basement unit was just installed a few months ago. The attic unit is 6 years old.
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Old 10-03-2010, 01:24 PM   #19
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Opinion: Electric WH w/ Heat Exchanger


Honeywell makes a Vision Pro IAQ indoor air quality tstat with a LOT of features. Lennox uses them as well and are called ComfortSense. You may want to get your dealer to install one and set it up to stop the heat pump and go with straight electric. Saves wear and tear on the heat pump and will work better than a HW tank.

http://customer.honeywell.com/Busine...US/Default.htm
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Old 10-03-2010, 01:34 PM   #20
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Opinion: Electric WH w/ Heat Exchanger


Resistance heat alone will make his electric bill 50% plus higher.

He has a poor set up on his stat.

I am surprised that his systems weren't over sized.

With the new basement unit. you should see some savings in your heating bill.

What was the old unit that was replaced?
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Old 10-03-2010, 01:44 PM   #21
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Opinion: Electric WH w/ Heat Exchanger


Out of my league when it comes to heat pumps/sizing and how to make a SYSTEM efficient. Too darn cold here for them. I guess they are critical to size and have proper airflow etc so they work efficiently. Hopefully they are sized /setup properly for his house.
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Old 10-03-2010, 01:50 PM   #22
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Opinion: Electric WH w/ Heat Exchanger


Generally. 450 CFM per ton for best efficiency. But you get lots of complaints in cold areas if you do that. Since the discharge temp is low then. So I set most of mine up at 375 to 400 CFM.

Many higher efficiency units, have a feature that the outdoor unit can so the blower to make for a warmer discharge temp. But it lowers BTU output also.

The OP may also have a humidity problem.

OP, what temp do you set your thermostats to in the winter.
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Old 10-03-2010, 01:56 PM   #23
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Opinion: Electric WH w/ Heat Exchanger


Hopefully it has enough freon in it also, has it been checked yearly?
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Old 10-03-2010, 02:13 PM   #24
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When we replaced the unit this year, I had two different companies come in and do sizing calculations to make sure we had the right size units. Both had the same results and the original unit was sized correctly. The outdoor unit got a hole in the coil and since it was pre 410 refrigerant, it was better to replace the entire system than to fix the old one, even though it was only 5 years old at the time. I should get a tax credit for the higher SEER as well. I am just going to have to suck it up for the cold months. BTW I am on planned service with two checkups yearly.
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Old 10-03-2010, 02:18 PM   #25
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Opinion: Electric WH w/ Heat Exchanger


So what temp do you set your thermostats to in the winter.

tax credit if it also meets the EER and HSPF requirements.
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Old 10-03-2010, 02:34 PM   #26
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Opinion: Electric WH w/ Heat Exchanger


I have a very cold blooded wife, so it is usually set at 73. Although the actual temp is usually a degree or so below that. I made sure the new unit met all criteria for the tax credit.
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Old 10-03-2010, 02:38 PM   #27
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Do you ever set your thermostats back. At night, or when you go to work?
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Old 10-03-2010, 02:41 PM   #28
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No, thought about a programable tstat but the hvac company wanted too much for theirs and if I buy my own, it voids the parts and labor warranty I bought with the system. Had quite an argument with them over the costs of their tstats, but they weren't very flexible on it.
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Old 10-03-2010, 02:43 PM   #29
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Good. Set back with a heat pump with electric aux heat actually increases the heating bill.
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Old 10-03-2010, 02:48 PM   #30
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Opinion: Electric WH w/ Heat Exchanger


Most likely to happen is that I will install a PV system next spring and see if that helps cut down on my bills some.

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