Since the 1990s, DDA has specialized in mobile temperature control as a RedDot Heavy Duty Air Conditioning distributor. From preventive maintenance to full system replacements, our technicians handle every aspect of vehicle climate systems — in-shop or on-site.
We serve fleets, owner-operators, and equipment managers who depend on consistent comfort and uptime. Whether it’s a single truck or a full fleet, DDA ensures your systems stay cool and compliant.
A/C Maintenance
Keep performance steady and downtime low.
Regular air conditioning maintenance prevents costly breakdowns and ensures your HVAC system runs at peak efficiency.
What We Handle:
Air filter replacements
Condenser cleaning
Belt inspections
System efficiency and pressure testing
Why Fleets Trust Us:
Preventive maintenance that reduces repair costs
Expert technicians familiar with heavy-duty A/C systems
Flexible scheduling for fleet service
A/C Repairs
Fast, reliable climate control repair — wherever you are.
DDA performs complete A/C system diagnostics and repairs at our Londonderry facility or directly on-site with fully stocked service trucks.
What We Cover:
Belt replacement
Refrigerant leak detection and recharge
Condenser and compressor repairs
Electrical and control system troubleshooting
Mobile service truck for job-site repairs
Why Fleets Trust Us:
Certified, experienced technicians
Fully equipped mobile service units
Quick turnaround and minimal downtime
System Replacement & Installation
Upgrade for lasting reliability.
When repair costs outweigh benefits, DDA designs and installs new A/C systems built for your specific vehicle or equipment type.
How It Works:
Custom system design and retrofitting
Truck, trailer, and heavy-equipment installations
Full RedDot system integration
Climate control solutions for off-road and specialty vehicles
Why Fleets Trust Us:
RedDot-authorized distributor and installer
Tailored designs for every application
Proven performance and warranty-backed installations
Parts & Components
Your source for RedDot Heavy Duty A/C parts.
We stock and source a wide range of OEM and aftermarket air conditioning components to keep your systems running efficiently.
What We Handle:
Compressors, condensers, and filters
RedDot A/C kits and components
Same-day parts ordering and pickup
Fleet parts programs available
Why Fleets Trust Us:
Authorized RedDot distributor
Fast sourcing and delivery
Technical expertise to match the right parts every time
Service Area
Serving fleets and operators across New Hampshire, Massachusetts, Maine, Vermont, Connecticut, Rhode Island, and New York with in-shop and mobile A/C service solutions.