COMMERCIAL HVAC SERVICE
24 hours a day - 7 days a week
Reliable Commercial HVAC & Refrigeration Service You Can Count On — 24/7, 365 Days a Year
Even with the most diligent preventative maintenance, commercial HVAC and refrigeration system failures are inevitable. Mechanical components wear down, electrical parts fail, controls malfunction, and unexpected breakdowns can happen at the worst possible times. When your heating, cooling, or refrigeration system goes down, your business operations, customer comfort, product integrity, and revenue are immediately at risk.
That’s why when failure strikes, you need a commercial HVAC contractor you can trust—one that understands urgency, responds quickly, and gets your system back online efficiently and safely.
At National Mechanical Services, we specialize in keeping commercial and industrial HVAC and refrigeration systems running reliably. We understand that downtime is not an option. Our team is prepared to respond when you need us most, whether it’s during business hours, overnight, on weekends, or on holidays.
When you call National Mechanical Services, you’re not just getting a repair—you’re gaining a dedicated service partner committed to protecting your equipment, your business, and your peace of mind.
Highly Trained Commercial HVAC & Refrigeration Technicians
The quality of your service provider is only as good as the technicians working on your equipment. At National Mechanical Services, our service technicians are experienced, highly trained, fully licensed, and safety-focused, ensuring every job is completed correctly the first time.
Our technicians are qualified to maintain, repair, and install all types of commercial and industrial HVAC and refrigeration systems, including but not limited to:
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Rooftop units
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Split systems
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VRF / VRV systems
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Chillers and hydronic systems
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Dedicated outdoor air systems (DOAS)
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Pool dehumidification systems
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Commercial refrigeration equipment
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Make-up air units and exhaust systems
Each technician holds EPA certification and the required Massachusetts Refrigeration Technician licenses, ensuring compliance with all state and federal regulations. We remain current with evolving HVAC technologies, refrigerants, control systems, and energy-efficiency standards so our customers benefit from the latest advancements in the industry.
In addition, our technicians receive OSHA safety training and approach every job with a strong commitment to workplace safety, code compliance, and best practices. From rooftops and mechanical rooms to occupied commercial spaces, we prioritize safety for our technicians, your employees, and your customers.
Factory-Trained Expertise Across Leading HVAC Brands
Modern commercial HVAC and refrigeration systems are more advanced than ever. Proper diagnosis and repair require brand-specific knowledge and hands-on experience. National Mechanical Services technicians are factory trained across a wide range of leading manufacturers, allowing us to service your equipment with confidence and precision.
Our experience includes systems from manufacturers such as:
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Mitsubishi
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Daikin
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Seasons 4
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Desert Aire
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Multistack
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And many other major commercial HVAC and refrigeration brands
This factory training allows us to identify issues faster, apply manufacturer-approved repair methods, and help protect your equipment warranties. Whether your facility operates a single rooftop unit or a complex multi-system installation, our team has the expertise to handle it.
24/7 Emergency Commercial HVAC Service in Massachusetts
HVAC and refrigeration emergencies don’t follow a schedule—and neither do we.
National Mechanical Services provides 24-hour emergency service, 7 days a week, 365 days a year. When your system fails, you can rely on a prompt response from a knowledgeable technician who understands the urgency of your situation.
We proudly serve commercial and industrial customers throughout Massachusetts and the Greater Boston area, including offices, retail spaces, medical facilities, restaurants, warehouses, manufacturing plants, schools, and multi-tenant buildings.
Our goal is simple: minimize downtime, reduce disruption, and restore comfort and system performance as quickly as possible.
Customized Commercial HVAC Maintenance Contracts in Massachusetts
While emergency service is critical, the most effective way to protect your HVAC investment is through proactive, scheduled maintenance. National Mechanical Services offers fully customized commercial HVAC and refrigeration maintenance contracts designed around your equipment, facility usage, and operational needs.
Every building is different—and so is every customer. That’s why we don’t believe in one-size-fits-all maintenance plans. We work with you to develop a maintenance schedule that makes sense for your business, budget, and system demands.
With a custom maintenance contract, we take the burden off your shoulders. You no longer need to worry about scheduling service visits or tracking maintenance intervals—we handle it all for you.
The Benefits of Routine Commercial HVAC Maintenance
Regular maintenance is one of the smartest investments you can make in your commercial HVAC and refrigeration systems. Properly maintained equipment performs better, lasts longer, and is far less likely to experience unexpected breakdowns.
Maintain Clean Air Filters and Belts
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Improved system efficiency
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Better airflow and performance
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Increased indoor air quality
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Reduced strain on motors and components
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Quieter system operation
Clean and Maintain Condenser Coils
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Increased energy efficiency
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Lower operating costs
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Extended equipment lifespan
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Reduced compressor stress
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Decreased likelihood of system failure
Reduce Emergency Repairs
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Identify worn or failing components before breakdown
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Address small issues before they become costly repairs
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Reduce unexpected downtime and business disruption
Detailed System Inspections
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Spot weaknesses early
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Verify proper refrigerant levels
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Ensure controls and safeties are operating correctly
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Confirm airflow, temperatures, and pressures are within design specifications
Maintain Secure Electrical Connections
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Prevent electrical failures
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Reduce fire and safety risks
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Improve system reliability
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Extend the life of motors, contactors, and controls
Simply put, a properly maintained HVAC system costs less to operate, lasts longer, and performs more reliably.
Protect Your Investment and Your Business
Your HVAC and refrigeration systems represent a significant investment—and they play a critical role in your daily operations. Whether you’re keeping customers comfortable, employees productive, or temperature-sensitive products protected, system reliability matters.
With National Mechanical Services as your service partner, you can be confident that your systems are being maintained by licensed professionals who take pride in their work and are committed to exceeding customer expectations.
Get Started with a Custom Maintenance Contract Today
Don’t wait for a breakdown to disrupt your business. Ensure your commercial HVAC and refrigeration systems are consistently and professionally maintained with a custom maintenance contract from National Mechanical Services.
Contact us today to schedule a consultation and learn how our tailored maintenance programs can help reduce costs, improve reliability, and extend the life of your equipment.
National Mechanical Services, Inc.
Your trusted commercial HVAC & refrigeration partner in Massachusetts.
24/7 Emergency Service: (781)662-8689 Office: (781)995-2343 email:
