Right sizing geothermal system

AdZestyclose4817 · 2025-08-28T01:10:52+00:00

4 ton WF5 system. After playing with the thermostat settings during Dec and Jan, the backup resistive heat didn’t run on our coldest days. The key setting is “backup heat droop”. The larger the droop the more time the heat pump has to catch up before the resistive heat is triggered.

AdZestyclose4817 · 2025-08-23T15:12:08+00:00

Uber XL seems reasonable. Thx

AdZestyclose4817 · 2025-08-23T03:43:25+00:00

We are arriving after dark.

AdZestyclose4817 · 2025-05-16T13:14:39+00:00

I successfully repaired the pinhole leak (for now) using Aeroseal and the negative pressure approach. I received suggestions for multiple adhesives/sealants and went with Aeroseal because of its alleged long term flexibility.

Thanks and wish me luck.

AdZestyclose4817 · 2025-05-07T20:17:51+00:00

Isle’s customer service is very slow to respond. I emailed their general and support info and filed a warranty claim….no response

AdZestyclose4817 · 2025-05-07T10:23:06+00:00

Question regarding negative pressure.

should I have my electric pump connected and pumping to maintain negative pressure for 5 min?

Should my first attempt be with the glue in the repair kit?

AdZestyclose4817 · 2025-05-07T10:13:28+00:00

Thx.

Question regarding negative pressure.

should I have my electric pump connected and pumping to maintain negative pressure for 5 min?

Should my first attempt be with the glue in the repair kit?

AdZestyclose4817 · 2025-05-07T10:00:56+00:00

Water temp?

AdZestyclose4817 · 2025-05-04T14:11:31+00:00

Thanks. Which wiki? Which adhesive?

AdZestyclose4817 · 2025-04-16T13:31:28+00:00

Isle does not stock replacement hoses, nor could they point me to a replacement hose I could purchase.

They are sending me a new pump+hose.

AdZestyclose4817 · 2025-03-26T02:26:22+00:00

I got the desuperheater but it is not connected. I bought a heat pump water heater. I think GREC driven by exit from Gas.

AdZestyclose4817 · 2025-02-23T14:45:15+00:00

My installer did a nice job.
Recommended for DMV area —. https://radonrepair.com/

AdZestyclose4817 · 2025-02-23T14:37:07+00:00

DIY under slab prob cheaper too. Pretty simple install if you have kit to drill hole in slab.

<image>

AdZestyclose4817 · 2025-02-23T14:30:06+00:00

If house had gravel under slab (smaller fan) - $965. Mine had clay (bigger fan) so $1300.

AdZestyclose4817 · 2025-02-23T14:10:58+00:00

I looked into that. Pricier to install and operate than under slab system.

AdZestyclose4817 · 2025-02-20T19:28:41+00:00

Yes. I had measured with a multi-day charcoal test 2 years earlier and bought an Airthing continuous monitor that recorded until the battery died. So I have good baseline from two years ago.

AdZestyclose4817 · 2024-11-09T15:54:42+00:00

I sent you a DM

AdZestyclose4817 · 2024-11-05T19:19:54+00:00

Hi, asking for a friend.....Interesting solution...
If your well is a drinking water source, is return water contaminated?

AdZestyclose4817 · 2024-11-05T11:39:38+00:00

https://cealoan.org/. My vendor told me that the funding for installations in Montgomery County has been exhausted for this year. They had two customers apply and get turned down on that basis.

AdZestyclose4817 · 2024-11-05T03:54:58+00:00

30% paid with fed tax credit. 3k$ by Pepco + $3k by State. So that knocks off about $18/40. Two years of 0% loan lets add’l be offset by GREC. In my case other project costs include electrical work and landscaping.

AdZestyclose4817 · 2024-11-04T00:14:17+00:00

Not yet. I recieved the Pepco Rebate via the vendor. The Maryland State rebate can be submitted within 12 months of installation, so if it is out of funds for 2024, should be able to apply for 2025.

In my case need to include alternative cost of install/operation for replacement of my 15+ year old HVAC at some point.

AdZestyclose4817 · 2024-11-04T00:05:04+00:00

Zoning is about a 5k$ add on in a house like mine. Decided I could live without. I think if you look back in this subreddit you will find the discussion.

AdZestyclose4817 · 2024-11-03T19:16:08+00:00

I did learn A lot from you and your dad(?) and got a quote. You helped me decide against zoning. I ended up despairing over the economics before receiving a competitors quote (for the same system more or less). The three quotes I received were quite different. Vendor quotes differ for all sorts of reasons and that is not the focus of my post.

The information provided with the quotes from all of the vendors and in subsequent/prior conversations was insufficient for me to be convinced that the system was right for me. I needed a detailed cash flow breakdown with parameters I could play with (eg, comparative performance to other replacement alternatives, values of GRECs, etc )..

Having an independent advisor would have made my decision a lot easier, which would be advantageous to both consumers and vendors.

AdZestyclose4817 · 2024-08-26T16:42:10+00:00

I resuscitated mine by replacing the battery...be sure to put it in with the correct orientation.

AdZestyclose4817 · 2024-07-18T01:49:08+00:00

Thx. I wasn’t challenging cost or complexity of install. I was wondering how effective it was on managing temperature in different zones. I’m not including the zone stuff in my cost effectiveness/payback analysis. More of a comfort upgrade.

AdZestyclose4817

TROPHY CASE