The project: IMEG provided mechanical, electrical, and plumbing engineering services for the Four Seasons Resort at Calistoga, a luxury destination set across 29 acres in the scenic hills of Calistoga, CA. The project included full infrastructure design for lodging, wellness, dining, and residential amenities.

The goal: The objective was to deliver a resort that reflects refined elegance while embracing modern, energy-efficient design—blending luxury with sustainability in a naturally integrated setting.

Project amenities: The resort features a wide range of high-end offerings, including:

• 16 villa buildings with 85 hotel units
• 20 private residences
• A large central pool facility
• Multiple outdoor pools
• Spa and fitness center
• A main lodge and banquet space
• Full-service restaurant with commercial kitchen
• Winery and vineyard
• Arcade

Design approach: IMEG’s design incorporated advanced sustainable systems tailored to the unique demands of a luxury resort. This included the Four Seasons brand’s first use of variable refrigerant volume (VRV) systems in villa buildings, paired with a geothermal loop to enhance overall energy performance.

Design highlights: Key components of the design include:

• High-efficiency systems: A 600-ton condensing water system and 200 tons of VRV equipment were carefully distributed across the site to maintain comfort and efficiency.
• Power infrastructure: A 5,000-amp electrical distribution system was designed to support the full scope of resort operations.
• Geothermal integration: The geothermal system was engineered to supplement both domestic water heating and the condenser water loop, contributing to substantial energy savings.

Project outcome: The Four Seasons Resort at Calistoga sets a new benchmark for sustainable luxury. The resort is modeled to use approximately 30% less energy than conventional systems, achieving a seamless blend of performance, comfort, and environmental responsibility.