Commercial HVAC & Mechanical Contractor
for Critical Facilities
Total Mechanical Services is a strictly commercial mechanical contractor headquartered in Del City, serving Oklahoma City, Tulsa, and statewide facilities. We support chillers, boilers, HVAC, and ventilation systems with 24/7 dispatch, planned maintenance, and documentation that reduces vendor-vetting friction.
Trusted by Oklahoma's Critical Facilities
System Failure?
Fast dispatch when a failure threatens uptime. Chillers, boilers, HVAC/R, and critical cooling.
Planned Projects
Retrofits, replacements, new construction support, and maintenance agreements—scoped for your facility and equipment.
Compliance & Safety
Vendor onboarding support: capabilities, safety culture, insurance, and qualifications for commercial and industrial facilities.
“Darrell and his team are wonderful to work with…efficient, trustworthy, knowledgeable, and responsive.”
Commercial Services
Six specialist service lines from an Oklahoma commercial mechanical contractor built for high-stakes facilities—where downtime, compliance exposure, and energy waste are real business risks.
Commercial Chillers
Emergency diagnostics, overhauls, and contingency cooling for critical uptime.
Industrial Boilers
ASME R-Stamp repair capability, inspection readiness, and safety-first execution.
HVAC & Ventilation
RTUs, MAUs, AHUs, and VAV systems—ventilation and pressure control included.
Building Automation
BAS troubleshooting, sequencing fixes, and VFD optimization without instability.
Process Piping
Code-minded repairs, tie-ins, and fabrication with testing and documentation.
Preventative Maintenance
Predictable costs, priority response, and fewer after-hours surprises.
Industries Served
We understand the regulatory and operational realities behind the work—ASHRAE 170 environments, kitchen ventilation balance, production uptime, and audit readiness.
Oklahoma Service Area
Dispatch coverage across Oklahoma, with fast response supported by hubs in OKC and Tulsa. Commercial and industrial facilities only.
Technical Resources
Practical guides for Facility Managers and building engineers.
Oklahoma Boiler Inspection Requirements: What Facilities Need to Know (and How to Pass)
A practical overview of Oklahoma boiler inspection requirements: how facilities prepare, what inspectors commonly flag, and how to avoid delays, rework, and shutdown risk.
RTU Winterization Checklist for Oklahoma Ice Storms: Freeze Protection, Hail Risk, and Start-Up
A practical rooftop unit winterization checklist for Oklahoma facilities: freeze protection, condensate and economizer checks, hail prep, and post-storm start-up steps.
24/7 Emergency HVAC Response in Oklahoma: What to Do in the First 60 Minutes
A practical, Oklahoma-specific emergency HVAC response playbook for facility teams: triage steps, what info to gather, expected timelines, and when to deploy backup cooling.
Engineering Your Operational Continuity
Your facility demands precision, not guesswork. Partner with a strictly commercial team built for uptime, compliance, and fast response—from planned maintenance to after-hours emergencies.
Commercial Inquiries Only