Every building owner eventually faces this question: your BMS is aging, parts are failing, service calls are increasing. Do you keep repairing it, or replace the whole system?
- Field devices (sensors, actuators): 15-25 years
- Controllers (equipment/zone level): 15-20 years
- Supervisory hardware: 7-10 years
- Software: Variable, depends on vendor support
- Wiring: 30-50+ years if properly installed
Signs It's Time to Replace
1. No Longer Supported: No software updates, no parts, no tech support from manufacturer
2. Parts Unobtainable: Controllers only available on eBay or equipment graveyards
3. Can't Meet Requirements: No LL97 data, no remote access, can't integrate new equipment
4. Service Costs Exceed Value: Spending >15-20% of replacement cost annually
5. Operational Failures: Can't maintain comfort, excessive energy waste
"We've seen buildings where a $200 controller cost $3,000 used + $5,000 in emergency labor + thousands in tenant complaints during downtime."
Signs Repair Still Makes Sense
- System still performs core functions (maintains comfort, controls equipment safely)
- Parts and support remain available
- Building's future is uncertain (sale, renovation, or conversion planned)
- Capital isn't available for replacement
- Failures are isolated, not systemic
The Middle Path: Partial Upgrades
- Keep existing controllers and field devices
- Add modern interface and analytics
- Enable integration with new BACnet equipment
- Platform for gradual replacement
- Replace based on condition and criticality
- Allows learning between phases
- Maintains operation throughout
- Reduces project risk
Calculating the Real Costs
- Direct repair costs (trending up 10-20%/year)
- Staff time managing service calls
- Energy waste from degraded control
- Risk of catastrophic failure
- Compliance penalties
- Hardware, software, licenses
- Installation and commissioning
- Design/engineering (10-15%)
- Training and disruption
- Minus: Energy savings (10-25%)
Decision Framework
- Assess current system condition: Age, failure history, parts availability, capability gaps
- Calculate 5-year cost to repair: Include projected repairs, energy waste, risk
- Calculate 5-year cost to replace: Include installation, subtract expected savings
- Consider non-financial factors: Risks, building plans, capabilities
- Document your decision: Creates accountability and baseline for future
The repair-vs-replace decision shouldn't be made by default or in a panic after a major failure. Proactive evaluation — before the crisis — allows for better decision-making.
Get Professional Input
Contact Controls NYC for an honest assessment of your building automation system. We'll help you understand your options and make the right call — even if that call is to keep repairing what you have.
Ready to Discuss Your Building?
Whether you're evaluating an upgrade, dealing with a failing system, or just want a second opinion — we're happy to talk through your options.
Schedule a Free Consultation