Case studies
The jobs that don't fit in a brochure.
A sampling of the harder, weirder, and more consequential HVAC projects we've delivered in the last three years.
Duluth, MN2025
A geothermal retrofit for a 1912 lakeside estate
Replaced two aging boilers with a closed-loop geothermal system, cutting heating cost by 63%.
Geothermal + high-efficiency air handler
Minneapolis, MN2024
North Loop tower: 24-floor VRF conversion
A phased conversion that kept 340 units occupied through six months of installation.
Variable refrigerant flow, 480 tons
Rochester, MN2024
Cedar Clinic surgical wing
HEPA and UV-C at every air handler; sub-40% RH under load for six operating suites.
Hospital-grade filtration + humidity control
Duluth, MN2023
Harbor District cold-storage warehouse
Waste heat now warms 42,000 sq ft of office and shipping bays year-round.
Ammonia refrigeration + heat recovery
Ready when you are