Case study · anonymised
32-room mountain resort in Zermatt: smart thermostats cut energy bills by CHF 19,400 annually
32-room family-owned mountain resort, leisure-led, Zermatt Alpine market, ADR ~CHF 380, occupancy ~76% year-round with strong winter and summer peaks
The challenge
The resort's annual energy bill had reached CHF 92,000 due to electric heating in 32 rooms operating year-round, including significant baseline heating in unoccupied rooms to prevent pipe freezing in winter. The owner had estimated that 25-35% of HVAC spend was wasted on empty rooms but had no instrumentation to measure or address the problem.
The approach
The team deployed Verdant Environmental Technologies smart thermostats across all 32 rooms, integrated with the existing PMS (Apaleo) for occupancy data, and configured occupancy-sensor-based deep setback when rooms were unoccupied. The deliberate decision was Verdant over cheaper alternatives because of Apaleo PMS integration depth; the property had previously tested generic smart thermostats that did not know occupancy status. Hardware cost CHF 11,500 plus CHF 3,800 installation; total project cost CHF 15,300.
Measured outcomes
Annual heating energy cost
Before: CHF 60,000
After: CHF 40,600 (32% reduction)
Annual total energy savings
Before: n/a
After: CHF 19,400 measured over 18 months
Payback period
Before: n/a
After: 14 months
Guest comfort complaints
Before: baseline ~6 per year on cold rooms
After: 4 per year (occupancy sensors briefly delay re-heating)
The failure pattern and the fix
The near-failure was during the first January when the deep-setback algorithm triggered low-temperature alarms in three rooms that had been left empty for two weeks while housekeeping was elsewhere. The Verdant system was configured to maintain minimum 12 degrees Celsius below which pipe-freeze risk activated; this worked but the alarm setup needed adjustment. A secondary configuration ensures that any room with adjacent occupied rooms maintains 16 degrees regardless of occupancy state, eliminating cold-room re-occupation complaints.
What we took away
The lesson is that smart-thermostat ROI is highest in extreme climates where heating or cooling is a major operating cost. The 14-month payback is on the fast end of the published range and would extend to 18-24 months in milder climates. The other lesson is that PMS integration is essential; thermostats without occupancy awareness deliver a fraction of the savings.
Anonymisation note
This case study uses anonymised property data: segment, room-count band, market region, and outcome metrics. The property is not named. Operator-reported figures are presented with that framing; published industry benchmarks are cited inline.