Frequently Asked Questions

The Dandelion Heat Pump fits homes with forced hot air heating (homes that distribute heat using ductwork and vents).

Check to see if Dandelion is available in your area.

Dandelion prioritizes new areas based on homeowner demand.

There are a few things homeowners can do to help us prioritize their area:

• Sign up here and ask your neighbors to do the same; the more demand we see in a given area, the more we will prioritize expanding there.

A home will require one or two ground loops depending on its heating and air conditioning needs. The ground loops are installed vertically by creating a hole approximately 6” in diameter, inserting the loop(s) and then filling in the hole. Because the loops are installed in this way, most yards are large enough to accommodate the ground loops. Dandelion’s team will make a decision based on a number of factors after you’ve completed your 30 second survey.

Once you’re ready to be installed your account manager will contact you with guidance.

The installation happens in three phases:

PHASE 1: Drilling

We drill the vertical bore holes that are used to install the ground loops.

PHASE 2: Trenching

We dig a trench from the bore hole location to your home to connect the ground loops to your geothermal heating & cooling system.

PHASE 3: Interior Install

Lastly, we will remove your existing furnace and install your heat pump, thermostat, and preheated water tank, and any other agreed upon work. This part of the installation takes place inside your home.

The duration of an installation varies based on the factors specific to the home.

Below are typical time frames for each stage of a Dandelion installation:

• Phase 1: Installation of the ground loops. 1-2 days per bore hole.
• Phase 2: Tie-in of the ground loops. 1-2 days per bore hole.
• Phase 3: Installation of the heat pump and system commissioning. Scope of work will dedicate the length of time associated with your project. Most installs take 2 – 4 days per heat pump. Additional time will be required for additional product options.

Ground loops are ~6 inches in diameter, installed to a depth of approximately 500 feet. The exact length will depend on the needs of the given home.

You will need to be home for the parts of the installation that take place inside the home. This includes the installation of the heat pump. You do not need to be home for the installation of the ground loops.

We have three types of drill rigs that are used depending on the access and geological consideration for your property. While our drill rigs vary in size from one another, they are both equally capable of executing the designed job.

Comacchio GEO 600: Track mounted, tight access rig

1. Drill rig with mast – drills the actual hole in the ground
2. Pipe and casing handler located on the drill rig – contains the drill rods and casing that goes into the ground
3. Air compressor – used to power the down hole hammers/drilling equipment, also helps clean the hole
4. Loop and grouting trailer – houses the equipment to run the ground loops and grout them appropriately
5. Dump Trailer – self-contained hydraulic dumping trailer that captures mud and spoils that come up from the borehole

Terrasonic 150 CC: Track mounted, tight access rig

1. Drill rig with mast – drills the actual hole in the ground
2. Pipe and casing handler located right behind the drill rig – contains the drill rods and casing that goes into the ground
3. Air compressor – used to power the down hole hammers/drilling equipment, also helps clean the hole
4. Loop and grouting trailer – houses the equipment to run the ground loops and grout them appropriately

Atlas COPCO TH60:  Truck mounted, and larger in size.

1. Drill, pipe handler and air compressor built as one unit
2. Support truck – houses the loops and extra materials
3. Grout trailer – houses the equipment for grouting

Drill rigs are assigned based on access and surface constraints related to your property. A property that is relatively smaller in size is likely to be assigned a tracked rig.

It is important to understand that potential impact to your yard is not just in the location that the boreholes are drilled, but is also related to the amount of water or dust that the geology on your property produces. For example, if your property has a significant aquifer, the act of drilling will draw more water out of the ground, creating more excess water than other properties.

Sediment control: 

1. Silt fencing – fabric erected around a dedicated site to prevent dirt and debris from washing away. While silt fencing is helpful, it won’t catch the finest clay particles, and those may still be seen through the exterior portion of your property.
2. Filter bags – giant heavy felt bags that we will pump water into if we are aware the large amounts of water will be generated

Dust control:

1. If the natural environment is not generating enough water we use water injection to suppress the dust if enough is not being generated

Dump Trailer:

1. Jobs that are drilled with the Comacchio drill rig will use a Dump Trailer that captures the mud and spoils that come up from the borehole

Drilling location is determined by considering a balance between rig access, trench path, and avoiding utilities so we minimize yard disturbance as much as possible, while still following all the legal requirements necessary to safely work on your property.

Drilling crews typically consist of 2-3 people.

1. Crew lead – driller
2. 1-2 equipment operators – the crew members may drive support vehicles to and from the property, and help to operate the equipment. Some crews have designated drilling and grouting crews, while other crews are trained to handle both parts of the drilling process

1. Locate planned bore locations and safely spot the rig (ensure rig is safe to set up for safe operations)
2. Set up mitigation strategies as specific to your project
3. Drill boreholes
4. Insert loop into borehole
5. Grout loops – we will fill the void space between the loop and the surrounding dirt with impermeable thermally conductive material made of bentonite. We then seal up the hole so it’s as close to its natural configuration as possible. The grout is engineered to transmit heat to and from the ground to meet our thermal capacity.
6. Pressure test – we will fill the loops with water, pressure test the loops, and cap them until the trenching team arrives to resume work.
7. Demobilize – we will move equipment off property

When drilling is complete, you will see the ground loops extend 2-3 ft above ground to let the trenching crew know exactly where the loops are located and where to excavate (these will be cut down). You may have metal casing sticking up until the trenching crew arrives as well. There will also be an overflow of grout, usually grey in consistency and located around the actual borehole. The trenching team is responsible for cleaning up your property and returning it to rough grade.

We use a mini excavator (Bobcat E 32 or E35) that comes on a trailer and is towed by a pick up. We also bring a dump trailer towed by a pick up truck to put drill spoils in.

1. Arrive on site and review the punch in location and trench path
2. Spoils are separated and moved out of the way of the trench path
3. A trench 2ft-4 ft deep depending on geology and utilities will be created. The straight away section is about 3ft wide and the section around bores is 5-6 ft around.
4. Cut the casing and additional ground loop at 2-4 ft below grade depending on how deep the trench is
5. Run the pipes connecting bores with horizontal piping to one another and to the home.
6. Drill 2 holes into the foundation with a core drill (3 inches in diameter)
7. Insert link seal to fill the excess hole around the pipe to prevent leaks
8. Concrete is placed over the link seal for extra protection against water intrusion.
9. Pressure test
10. Backfilling begins (any section shallower than 4ft or something crossing a flowing utility (drain pipe or sewer line) will be insulated
11. Level to as close to previous grade and remove excess drillings and soil
12. Create as built and put flagging tape approx 1 ft under surface so others can more easily note the location of the pipes

Trenches are 2ft to 4 ft deep depending on geology and utilities. For trenches above the frostline, the pipes will be insulated.

1-3 people are on a trenching crew. The crew will always consist of 1 crew lead responsible for making sure design is followed.

Our trenching crews will leave your yard in rough grade, meaning they will bring the area back to as close to level as it was previously. We will backfill your trench with soil from your property and do not bring in foreign materials. Soil varies in consistency and color at different depths so the finished product may look different than before work began.

1. Site walk with crew lead to confirm access points verify scope of work, and determine installation plan for removing your existing heating and getting heating on with new equipment
2. Crew will bring tools and materials into mechanical spaces
3. Crew will start to decommission existing air conditioner, if you have one
4. Crew will tie in to the ground loop, perform electrical requirements, complete ductwork (if applicable), install desuperheater (if applicable), install condensate line, wire thermostats
5. Commissioning of the heat pump

Your equipment will be removed from your property and properly disposed of.

A crew consists of 2-3 people. Depending on the size, scope, and complexity of your project, we may decide to send a larger crew. It is most common for the same crew lead to be onsite for the duration of your project. Personnel availability may lend to swapping out crew members from time to time.

Scope of work will dedicate the length of time associated with your project. Most installs take 2 – 4 days per heat pump. Additional time will be required for additional product options.

You will need to be home for the parts of the installation that take place inside the home. This includes the installation of the heat pump. You do not need to be home for the installation of the ground loops.

It is our goal to never leave you without heating. We are typically able to have at least temporary heat up within the same day of removing your old system. In extenuating circumstances we will provide you with temporary heat which may include space heaters.

We don’t provide additional air conditioning support, but work to get your unit functioning as quickly as possible.

For more information on the cost of a Dandelion Geothermal Heating and Cooling system, please visit this page.

2021 is an exceptionally good year for home geothermal incentives.

More information on federal, state, and utility incentives is available here.