Discovery Sound Technology (DST)

Detect equipment failures before they happen — without shutting anything down. Yale Mechanical is Minnesota's only contractor utilizing DST for HVAC/R service.

Yale Mechanical tech testing commercial HVAC with DST

The Solution to Reactive Maintenance

Discovery Sound Technology (DST) is a patented predictive maintenance (PdM) platform that uses high-frequency ultrasound to diagnose the real-time condition of HVAC/R equipment. Unlike traditional inspection methods, DST captures, analyzes, and documents equipment health data — including remaining useful life estimates — while systems remain fully operational.

DST's cloud-based Discovery Platform transforms raw ultrasound data into actionable diagnostics, trending reports, and capital planning recommendations — putting technicians, business owners, and their clients on the same page.

DST inspection on Minneapolis business HVAC system by Yale Mechanical tech

Benefits of Discovery Sound Technology

Early Fault Detection – DST identifies abnormal sounds — friction, impacts, cavitation, and bearing wear — at an early stage, long before they produce visible symptoms or cause component failure.
Non-Destructive Testing – Ultrasound inspection is completely non-intrusive. DST can be used during normal equipment operation with no shutdowns, no disassembly, and no risk of damage.
Up to 50% Faster Than Other Methods – DST's platform is designed for efficiency. Technicians can complete diagnostic scans significantly faster than with comparable methods.
Cost Savings: Catching small faults early saves big in the long run. DST finding a loose electrical connection on a compressor might result in $400 repair that, if left unnoticed, could have led to a $7,500 total replacement.
Cloud-Based Reporting and Trending – Every scan is date- and time-stamped and stored in DST's cloud platform. Technicians and clients gain access to full equipment history, trend reports, and capital asset repair or replacement recommendations over time.
Improved Client Transparency – DST generates professional tasking sheets, photo and video documentation, and field technician notes — making it easy to communicate findings.
Versatility Across Equipment Types – DST works on chillers, air handlers, rooftop units, pumps, motors, compressors, gears, valves, and more — making it useful across the full scope of HVAC/R service work.

Switch to Proactive Maintenance

How Does DST Work?

DST uses high-frequency ultrasound — a proven, non-destructive testing method — to listen for the sounds that indicate mechanical stress, wear, and impending failure inside HVAC/R equipment. Because ultrasound detects anomalies at a microscopic level before they produce heat, vibration, or visible damage, it gives technicians a critical early-warning advantage.

Scans can be performed while equipment is running, with results fed directly into the cloud-based Discovery Platform for analysis, trending, and documentation.

For ongoing monitoring, DST's RMx (remote monitoring) technology allows ultrasound sensors to be mounted permanently on equipment, providing continuous condition data throughout the life of the asset — without requiring a technician to be on-site for every reading.

What DST Can Detect?

DST's ultrasound diagnostic platform can identify a wide range of mechanical and system conditions, including:

Bearing and motor wear
Friction and impact events in rotating components
Cavitation in pumps and compressors
Air, gas, and refrigerant leaks
Electrical issues and arcing
Valve and gear abnormalities
Early-stage compressor degradation

Sample DST Report

Every DST inspection produces a living, cloud-based report your team can access anytime. Here is what it includes:

DST Health Score (0 to 100): A numeric health score for each unit and your entire building. Higher is healthier. The sample here tracked 114 units across 219 tests, producing an overall score of 82.
Color-Coded Severity Indicators: Red means a critical problem requiring immediate action. Yellow means an issue worth monitoring with life remaining. Green means normal operation. No guesswork.
MSi Inspections Completed: Shows scans completed per unit out of the total scheduled (4/4), so nothing gets missed.
Equipment Evaluations: Condition assessments per unit used to forecast repairs and replacements before a failure forces the decision.
Tasking Sheets: Auto-generated action items when a scan flags an issue, keeping your team and Yale Mechanical technicians aligned on next steps.
Real-Time Data: The dashboard refreshes every time you open it, so you always get the most current picture of your building's mechanical health.

Why Yale Mechanical for DST?

When you choose Yale Mechanical, you get:

Expert equipment assessments using DST ultrasound diagnostics to establish baseline condition and identify existing issues
Minnesota exclusivity makes Yale Mechanical the only contractor in the state offering DST predictive maintenance diagnostics.
Ongoing scheduled scanning with full documentation, trend reports, and capital planning recommendations
Clear, client-facing reporting that explains equipment health in plain language — no guesswork, no surprises
Integration with our planned maintenance programs for a complete picture of your building’s mechanical systems
A trusted partner with 85+ years of experience serving facilities throughout the Minneapolis, St. Cloud, and Upper Midwest region

DST FAQ

How does DST help with planning and equipment budgeting?

One of the most overlooked benefits of DST is what it does for your budget cycle. Rather than waiting for a compressor to fail and scrambling to justify an emergency replacement, DST analysis gives you documented, trending equipment health data you can bring directly into your annual planning process. You can prioritize repairs and replacements based on actual remaining useful life, not guesswork, and present ownership or finance teams with hard data instead of estimates. For facilities carrying aging HVAC equipment, that kind of lead time can be the difference between a planned capital expense and an unplanned crisis
How is DST different from infrared thermography or other diagnostic methods?

Infrared testing is a widely used tool, and a good one, but it works by detecting heat that a fault is already generating. By the time a problem shows up on a thermal camera, it has usually been developing for a while. DST's ultrasound technology detects the friction, wear, and electrical anomalies that produce that heat long before any thermal signature exists. That earlier detection window is where the real cost savings live. The two methods are not mutually exclusive, but DST consistently catches problems at a stage where repair costs are a fraction of what they become if you wait for heat or vibration to show up.
How often should DST scans be performed?

For most facilities, quarterly scans aligned with existing preventative mainenance visits are a good starting point. Equipment flagged with yellow or red health scores may warrant more frequent check-ins. For mission-critical assets, Yale Mechanical can deploy DST's RMx remote sensors for continuous monitoring between visits. Cadence is ultimately tailored to your equipment, building, and risk tolerance.
What types of facilities benefit most from DST?

Any facility where unexpected HVAC/R failure carries serious consequences is a strong candidate. That includes healthcare settings where temperature and air quality are non-negotiable, mission-critical facilities like data centers where downtime is measured in dollars per minute, manufacturing and cold storage operations where equipment failure disrupts production, and large commercial or multi-tenant buildings where a single system failure affects dozens of occupants. If your facility cannot afford an unplanned breakdown, DST gives you the early warning system to make sure one does not happen.