[comfortfiend]

As the title says, I've noticed that my newly installed GSHP does well at 50, 40, 30, or 20 degrees when temps vary +/- 2 degrees.

Once we're in colder weather and the temps are rising OR falling (typically transition to and from the mid-30s and mid-20s) my HP struggles and needs 2-3x the time to heat the house. At times it even struggles to lift the temp and my AUX system gets engaged.

Any idea why this is the case?

Thanks!

Additional info: I have a DX system from Total Green Manufacturing and I am fully insulating my house in a week. These problems should go away. I was just wondering why this was the case.

 

[pecmsg]

Pressure and temperature readings of water in and out?

 

[kdean1]

Are you using a setback? If you are, I suggest limiting it to no more than 3*.

 

[comfortfiend]

Are you using a setback? If you are, I suggest limiting it to no more than 3*.

I used to have a 2 degree setback which I changed to 1 degree (i was previously optimizing for shoulder temps which is when the system was first installed).

This has helped reduce AUX engagement to 1-2 times a day AT MOST.

 

[comfortfiend]

Pressure and temperature readings of water in and out?

Unfortunately do not have that on-hand as part of my system. I opted for a DX system from Total Green Manufacturing (vs. regular from let's say WaterFurnace).

Should there be gauges somewhere that help me ID that info?

 

[kdean1]

Unfortunately do not have that on-hand as part of my system. I opted for a DX system from Total Green Manufacturing (vs. regular from let's say WaterFurnace).

Should there be gauges somewhere that help me ID that info?

Not usually. It adds to the cost of the installation. Some high end equipment has a jack to connect a meter/gauge that the tech can use.
Lacking the jack, the technician carries instruments to take those readings.

 

[pecmsg]

Unfortunately do not have that on-hand as part of my system. I opted for a DX system from Total Green Manufacturing (vs. regular from let's say WaterFurnace).

Should there be gauges somewhere that help me ID that info?

Without pressure and temperature gauges you can't troubleshoot.

 

[comfortfiend]

Without pressure and temperature gauges you can't troubleshoot.

Understood - will get a tech out here. Wanted to see if anyone had any ideas before I did.

Thank you!

 

[BNME8EZ]

Post 1 in green says the house is not completely insulated. If it is not fully insulated is it completely constructed?

It may just be you are getting anxious.

 

[comfortfiend]

Post 1 in green says the house is not completely insulated. If it is not fully insulated is it completely constructed?

It may just be you are getting anxious.

Hahaha!

Existing home from 40s transitioned to geothermal which has to include insulation work. We lose 1 degree every 25 mins or 2 degrees every 45 mins. Classic leaky home.

Just curious about the weird behavior. My understanding was that low temps trigger worse performance. In my case it appears that changing temps trigger worse performance.

Insulation will make this a non issue.

 

[hvacvegas]

Without pressure and temperature gauges you can't troubleshoot.

DX is where the refrigerant circuit goes in the ground.
No water.

Just straight condenser piping buried.

I hate to tell you this, but in cincinnati youd be hard pressed to find anyone will to touch that system.

 

[comfortfiend]

DX is where the refrigerant circuit goes in the ground.
No water.

Just straight condenser piping buried.

I hate to tell you this, but in cincinnati youd be hard pressed to find anyone will to touch that system.

Appreciate the warning but in our area (30 mins north of NYC) the best option we have for geothermal installations all do DX but I did go into this somewhat eye wide open re: how niche the system is vs standard geothermal.

Was just curious if anyone had any answers before the installer comes out.

 

[kdean1]

DX is where the refrigerant circuit goes in the ground.
No water.

Just straight condenser piping buried.

I hate to tell you this, but in cincinnati youd be hard pressed to find anyone will to touch that system.

I know a guy in Monroe, OH who will. Third generation HVAC, last I knew he still works on systems that have loops with refrigerant.

 

[second opinion]

Your ground loop is the critical part of the whole system both DX and water loop leading to poor performance and subsequent failure.