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HVAC Settings? - Aux Power
Posted on 1/27/26 at 8:22 am
Posted on 1/27/26 at 8:22 am
My Aux Power seems to be running more than I would expect so can someone give me an idea of what they are using for these settings. I think mine are too high.
Aux Heat Max Outdoor Temp?
Compressor Min Outdoor Temp?
And then I think there is a temp differential setting?
Aux Heat Max Outdoor Temp?
Compressor Min Outdoor Temp?
And then I think there is a temp differential setting?
7
Posted on 1/27/26 at 2:27 pm to TimeOutdoors
I changed mine to 15 degrees for min temp for heat pump to turn on so it wouldn't solely use aux heat
Posted on 1/28/26 at 4:46 am to TimeOutdoors
What’s your outside temp OP? When it gets below a certain temp your heat pump doesn’t work and the Aux Heat (“Emergency” heat strips kick in. If you are in the areas that are very cold right now that’s likely what’s happening?
Or are you suggesting this has been occurring all winter?
Or are you suggesting this has been occurring all winter?
Posted on 1/28/26 at 6:10 am to baldona
quote:
Or are you suggesting this has been occurring all winter?
It happens more than it should. I was going to take a photo of the thermostat settings when I got home yesterday, but the elec was out. I am going by memory, but I believe the Min Outdoor Temp setting for the Compressor was 35 (what was recommended by Ecobee) and the Aux Heat Max outdoor Temp was 40 (I believe it recommended 5 degrees above the compressor setting). There was also an Aux temp delta which I believe was set at 3.2 degrees.
It just seems to be happening more than I would have expected.
Posted on 1/29/26 at 7:03 pm to TimeOutdoors
My heat pump kicks into stage 2/auxiliary heat if I raise the temperature up two degrees. Once the temperature comes up one degree it turns off the aux heat. I have to flip a switch to turn on the actual emergency heat.
This post was edited on 1/30/26 at 6:19 am
Posted on 1/29/26 at 7:16 pm to TimeOutdoors
Aux heat also kicks on during defrost cycles.
Posted on 2/1/26 at 3:01 pm to TimeOutdoors
Call whatever professional you normally use for HVAC service and have them check your system and performance test it.
You could have a leak and have a low refrigerant level which will cause the unit to be inefficient at extreme temps, but still function normally when temps are normal.
You could have a leak and have a low refrigerant level which will cause the unit to be inefficient at extreme temps, but still function normally when temps are normal.
Posted on 2/1/26 at 7:52 pm to TimeOutdoors
What is auxiliary heat source? From electric heat strip?
Posted on 2/1/26 at 8:09 pm to TimeOutdoors
Oops, nevermind, it's the heat strip.
Posted on 2/3/26 at 10:48 pm to Clames
quote:
Aux heat also kicks on during defrost cycles.
I don’t know a lot about HVAC systems but the way I recall my hvac guy explaining it to me is when the outdoor temp gets near freezing, the heat pump freezes the condensation that’s building up on it, rendering it useless. This is when it goes into defrost mode and the AUX heat turns on to continue heating the home. Once defrosted, AUX will turn off and the heat pump will resume normal heating duties.
What prompted this explanation to me was me calling him to report that sometimes the system blows cold air when on heat, then suddenly it’ll warm back up after a while. Sure enough, this typically happens when temps outside are near freezing.
Posted on 2/4/26 at 8:13 am to TDsngumbo
That's what happens.
When you're heat pumpin, the unit is basically running backwards, rejecting heat into the air handler rather than to the atmosphere. The outside coil becomes the evaporator and the inside the condenser.
That means the outside coils are cooler than the ambient air and form condensation which of course freezes when the temperatures are very low, which requires a periodic defrosting.
Heat pumps get weird when it's both below freezing and humid outside.
When you're heat pumpin, the unit is basically running backwards, rejecting heat into the air handler rather than to the atmosphere. The outside coil becomes the evaporator and the inside the condenser.
That means the outside coils are cooler than the ambient air and form condensation which of course freezes when the temperatures are very low, which requires a periodic defrosting.
Heat pumps get weird when it's both below freezing and humid outside.
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