Teton County reviews sustainability options, LEED targets and HVAC choices for Justice Center

Teton County officials and the project's architectural and engineering team reviewed sustainability goals, energy modeling and mechanical system options for the proposed Teton County Justice Center during a March 10, 2025 workshop in Jackson.

The presentation, led by James Taylor of Anderson Mason Dale Architects with sustainability consultant Kath Williams and mechanical engineer Sam Meintz, described a design-development phase that the team said is roughly 25% complete, a LEED Silver target and alternatives for the heating, ventilation and air-conditioning (HVAC) systems, including heat-pump primary systems with either gas or electric backup.

The workshop laid out why the team is balancing long-term durability, maintainability and resiliency against aggressive sustainability goals. "This building really we want to build at once and we want it to last for generations," Taylor said. Kath Williams described LEED as "a measurement tool" that educates designers and documents performance; the team said LEED Silver is the project's current goal but that a "path to gold" analysis would be prepared.

Nut graf: Commissioners pressed the team for clearer payback numbers, greenhouse-gas estimates and a costed comparison of systems before making final decisions. The county asked the design team to carry alternates through design development so the commission can later decide whether to pursue LEED Gold, off-site renewable options and whether to specify gas or electric backup for cold-weather heating.

The engineers described a shortlist of HVAC approaches and trade-offs. Mechanical engineer Sam Meintz said the team prefers a heat-pump-based system for the majority of annual heating and cooling needs but acknowledged heat pumps lose capacity in extreme cold and require a backup heating source. "At about 0 degrees or 5 degrees outside, we have to switch over to that backup heating source," Meintz said, estimating the swap would occur for roughly several hundred to about 1,000 hours per year depending on the winter. The choice between gas-fired backup and electric resistance backup affects greenhouse-gas emissions, generator sizing and first cost.

The team presented preliminary energy-modeling results and said the baseline building utility cost is roughly $73,000 per year; initial modeling showed modest annual energy savings from proposed measures but a measurable change in greenhouse-gas emissions when gas is introduced as a backup. "When we do introduce gas, there is more greenhouse gas emissions because we've got a gas fired piece of equipment," the team reported.

The consultants advised third-party commissioning to verify systems perform as designed and to train county facilities staff. "Commissioning services ... verify that all the controls are operating appropriately," Meintz said, adding the commissioning authority reports to the owner rather than the contractor.

On renewables and materials, the team said ground-source (geothermal) and wind were not appropriate at scale for the site; rooftop photovoltaics would not power the whole building and may have limited winter benefit, but rooftop PV or off-site solar could provide partial offsets. The team recommended investigating off-site or grid-scale solar projects as an alternative compliance path. They also described materials strategies (construction waste diversion, use of lower-carbon concrete mixes such as fly ash/slag where appropriate, and low-VOC interiors) and said life-cycle analysis can quantify the project's embodied greenhouse-gas emissions.

Public commenters and community advocates urged stronger climate and resilience planning. Margie Lynch of the Jackson Hole Climate Action Collective told commissioners she supported prioritizing all-electric systems where feasible, requested explicit climate-risk and resilience analysis, and asked the team to quantify the project's total greenhouse-gas emissions.

Commissioners asked the team to return with clearer payback-period estimates, a more complete energy-model comparison of the gas versus electric backup scenarios, quantified life-cycle greenhouse-gas numbers and a costed path to LEED Gold. Commissioner Probst asked about payback horizons and said, "If it's under 10, that's easier to explain," while Commissioner Gardner requested copies of the readable charts and schedules used in the presentation.

Ending: The design team said it would continue refining the energy model, carry alternates and maybes through design development and return to the commission in a few months with cost reconciliation and firmer recommendations on the HVAC backup strategy, LEED targets and renewable options.