Why the Loop Matters
The ground loop is the part of a geothermal system that actually exchanges heat with the earth. It's also the part most affected by your property — its size, soil, and access to water. Knowing the options helps you understand whether geothermal is physically feasible on a particular lot before you get deep into equipment or cost discussions.
1. Horizontal Closed Loop
Core idea: pipe is placed in trenches dug across the property.
Typical fit: often the most cost-effective option for new residential construction when enough land is available. The DOE specifically notes that horizontal installation is commonly the most economical residential approach during new construction with adequate land — which is exactly why some newly built homes are designed around geothermal from the start.
2. Vertical Closed Loop
Core idea: pipe runs down through drilled boreholes instead of long trenches.
Typical fit: useful where lots are smaller or land area is limited — such as infill lots in established Dallas neighborhoods. Drilling costs more per foot than trenching, but a vertical loop leaves far more of the yard untouched.
3. Pond/Lake Closed Loop
Core idea: coiled piping is submerged in an adequate body of water on or next to the property.
Typical fit: potentially lower cost when a suitable water body exists. The pond or lake must be large and deep enough to handle the system's heat exchange year-round, so it only works on certain properties.
4. Open Loop
Core idea: groundwater or surface water passes directly through the heat pump system, then is returned or discharged.
Typical fit: requires a sufficient supply of clean water and compliance with local water-use and discharge rules. Because of those requirements, open loops are less common in typical DFW subdivisions.
Quick Comparison
• Horizontal closed loop — trenches — best when there's enough land, especially on new builds.
• Vertical closed loop — drilled boreholes — best for smaller lots or limited space.
• Pond/lake closed loop — submerged coils — best when an adequate water body is available.
• Open loop — groundwater or surface water — best where clean water is plentiful and local rules allow it.
Which One Is Right for You?
Only a site evaluation can answer that. A qualified geothermal provider will look at lot size and layout, soil and drilling conditions, local permitting, and your home's heating and cooling load before recommending a loop design.
Climate Codes can connect Dallas–Fort Worth homeowners and builders with providers who do this kind of evaluation — just tell us about your property.