HVAC Issues
1. Central AC fixed-mode thermostats cannot be adjusted independently; recommend VRV/four-pipe system + individual control per room
2. AC noise exceeds limits; terminal noise should be ≤NC-30
3. Insufficient fresh air; DOAS dedicated fresh air ≥30 m³/h·person required
4. Moldy odor from air outlets; requires regular cleaning + UV sterilization
Plumbing and Drainage Issues
1. Insufficient water pressure; terminal pressure ≥0.15 MPa + variable-frequency water supply
2. Long wait for hot water; full-circulation piping for hot water on demand ≤10 seconds
3. Bathroom odors; floor drain automatic water replenishment + trap ≥50 mm
4. Shower area slope ≥2% + water-retaining design
Electrical and Lighting Issues
1. Layered guest room lighting design (base 150 lx + reading 300 lx + night light)
2. ≥2 outlets per bedside side including USB-C fast charging
3. Smart room control system with manual backup mode
Sound Insulation Issues
1. #1 complaint source for four-star hotels; partition walls require STC ≥50
2. Pipe noise wrapping + resilient supports
3. Street-facing exterior windows with insulating LOW-E glass
Key Focus by Hotel Type
Economy: sound insulation / bathroom / water pressure
Mid-range: AC temperature control / WiFi / outlets
High-end: smart systems / hot water / lighting
Resort: equipment noise / waterproofing / pest prevention