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Dec 30th, 2023
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 Re: HVAC question
[Re: Emit R Detsaw]
#13884785
02/12/21 07:07 PM
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Joined: Jan 2018
Posts: 2,561
Jeff From Iowa
Extreme Angler
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Extreme Angler
Joined: Jan 2018
Posts: 2,561 |
I have a ceramic space heater in our master bedroom as it gets cold AF in there for some reason while the rest of the house is toasty with the central heater set at 70.
Gets hotter than hades in there in the summer and I got that little portable AC unit for that room in summer.
Hope this helps. I wonder if the air duct for that room is damaged in someway. They might have done like I had on a house. They had used cord to hold a couple ducts up off the insulation in our San Antonio house. Problem was, the cords basically folded the ducts in half and had them touching the ceiling. Once new hangers were installed for those 2 ducts to loosely hold the ducts about half way between the insulation and the ceiling, the rooms they went to were much better. Edit on how I fixed it: I cut a few 1x6 pieces and put the cord thru the ends, with the duct resting on the 1x6 swings. If you replace even 5’ of that flexible duct w solid pipe you will gain 5-10% more air flow. The flexible duct is a terrible restriction in the air flow. I’m a union sheetmetal worker by trade.
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Re: HVAC question
[Re: gregpaul]
#13884922
02/12/21 08:52 PM
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Joined: Jul 2002
Posts: 5,744
Mark C
TFF Celebrity
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TFF Celebrity
Joined: Jul 2002
Posts: 5,744 |
I started charting my heat pump this afternoon. With the thermostat set on 65 and an outside air temp of 25, it runs roughly two minutes for every minute it's off. Not real thrilled about that seeing as where we're headed this weekend.
You are not a good or nice person.
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Re: HVAC question
[Re: Mark C]
#13885091
02/12/21 10:35 PM
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Joined: Apr 2006
Posts: 24,870
outfishdya
TFF Guru
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TFF Guru
Joined: Apr 2006
Posts: 24,870 |
I started charting my heat pump this afternoon. With the thermostat set on 65 and an outside air temp of 25, it runs roughly two minutes for every minute it's off. Not real thrilled about that seeing as where we're headed this weekend. 65? Your house is an ice box... My family likes it around 73 or 74.... We don't heat pump either
Woke up this morning
Got yourself a gun....
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Re: HVAC question
[Re: outfishdya]
#13885097
02/12/21 10:38 PM
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Joined: Mar 2008
Posts: 61,059
LoneStarSon
Private Dancer
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Private Dancer
Joined: Mar 2008
Posts: 61,059 |
I started charting my heat pump this afternoon. With the thermostat set on 65 and an outside air temp of 25, it runs roughly two minutes for every minute it's off. Not real thrilled about that seeing as where we're headed this weekend. 65? Your house is an ice box... My family likes it around 73 or 74.... We don't heat pump either We keep ours at 67 during the day and 64 at night in the winter. 72 during the day and 68 at night in the summer.
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Re: HVAC question
[Re: outfishdya]
#13885127
02/12/21 11:06 PM
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Joined: Jul 2002
Posts: 5,744
Mark C
TFF Celebrity
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TFF Celebrity
Joined: Jul 2002
Posts: 5,744 |
I started charting my heat pump this afternoon. With the thermostat set on 65 and an outside air temp of 25, it runs roughly two minutes for every minute it's off. Not real thrilled about that seeing as where we're headed this weekend. 65? Your house is an ice box... My family likes it around 73 or 74.... We don't heat pump either I just keep crankin it down and adding layers. It's like camping except the wife is here.
You are not a good or nice person.
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Re: HVAC question
[Re: WAWI]
#13885273
02/13/21 01:04 AM
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Joined: Jul 2007
Posts: 1,266
Tsunami_1
Extreme Angler
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Extreme Angler
Joined: Jul 2007
Posts: 1,266 |
I agree. Disclaimer: I'm not a HVAC expert but I do believe this to be true for most if not all heat pump units. Heat pump will run full time and if needed the aux. heat kicks in to assist if the heat pump can't maintain the required heat. Your unit can and will also go into "emergency heat" if you make a major thermostat change. For economical reasons it's best not to make any thermostat changes higher than 2 degrees at a time. Quick run down on costs: Heat pumps usually pull about 3-4 KW load meaning for every hour they run they will put 3-4 kwh's on your meter. (average costs 0.30-0.40 cents per hour) Aux. Heat usually pulls 15 KW ($1.50 per hour) Emergency Heat usually pulls 25 KW ($2.50 per hour) These numbers can vary according to your unit but as you can see Emergency heat is about 6 to 8 times higher.
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Re: HVAC question
[Re: gregpaul]
#13885280
02/13/21 01:08 AM
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Joined: Dec 2011
Posts: 97
Delbert
Outdoorsman
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Outdoorsman
Joined: Dec 2011
Posts: 97 |
I to have the drama of a heat pump hvac system. Here are my results on heat pump outside ambient air temperature 29* thermostat set at 69* Heat pump return air 69* vent temperature is 76* on emergency heat return air is 69* vent temperature is 106*. While emergency heat is more expensive my theory is it’s cheaper to repair than knocking out the compressor. Maybe a certified a/c repair person will have better input.
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Re: HVAC question
[Re: gregpaul]
#13885284
02/13/21 01:12 AM
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Joined: Dec 2011
Posts: 97
Delbert
Outdoorsman
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Outdoorsman
Joined: Dec 2011
Posts: 97 |
Thanks Tsunami. You posted while I was slowly typing.
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Re: HVAC question
[Re: Tsunami_1]
#13885413
02/13/21 03:34 AM
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Joined: Mar 2012
Posts: 11,008
BigDozer66
TFF Guru
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TFF Guru
Joined: Mar 2012
Posts: 11,008 |
I agree. Disclaimer: I'm not a HVAC expert but I do believe this to be true for most if not all heat pump units. Heat pump will run full time and if needed the aux. heat kicks in to assist if the heat pump can't maintain the required heat. Your unit can and will also go into "emergency heat" if you make a major thermostat change. For economical reasons it's best not to make any thermostat changes higher than 2 degrees at a time. Quick run down on costs: Heat pumps usually pull about 3-4 KW load meaning for every hour they run they will put 3-4 kwh's on your meter. (average costs 0.30-0.40 cents per hour) Aux. Heat usually pulls 15 KW ($1.50 per hour) Emergency Heat usually pulls 25 KW ($2.50 per hour) These numbers can vary according to your unit but as you can see Emergency heat is about 6 to 8 times higher. Theoretically that is correct. When your HP goes into defrost, and the thermostat is calling for heat, your heat strips will kick in at 10KW, 15KW, or 20KW (for most residential) and your compressor will be running at the same time to defrost the condenser. There are some AC Contractors that will not wire the HP units to run the Aux. Heat unless it is switched to Emergency Heat. Bottom Line:If you set your thermostat on XX temp and your HP unit won't keep you at that temperature then turn it to Emergency Heat and stay warm.  If your unit isn't charged correctly (low refrigerant) or if there is something else wrong have it checked out. The newer R-410A units heat much better than the old R-22 units so take that into consideration as well. 
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