Our Work

RJA is an industry leader in building systems design, energy analysis, and commissioning to deliver outstanding buildings. Using an integrated approach, we design healthy living, practical building systems that are comfortable, energy efficient and cost effective. We foster collaborative and strategic client relationships by sharing knowledge, best practices, protocols and standards that address their specific needs. Let us create inspiring and customized solutions for your project through our diverse experience and technical expertise.

Mechanical, Electrical, & Plumbing

Ramirez, Johnson & Associates, LLC (RJA) provides mechanical, electrical and plumbing design services to our clients through a collaborative, team oriented approach. Our engineers are able to provide a wide variety of mechanical system design solutions and considerations to meet the needs of any project. The type of project experience RJA can bring to the table includes solutions for commercial, retail, food service, K-12 educational facilities, multi-family housing, healthcare, historic preservation, renovation, hospitality, government, industrial, laboratory and tenant finish.
Cooling Tower

Eric and Darin's combined 21 years of experience in the design and construction of mechanical and plumbing systems adds value to any project. Whether it is a budget conscious, fast-tracked commercial renovation, a LEED Platinum net-zero building, or a mission critical controlled environment of a hospital operating room addition or a clinical laboratory, RJA can develop a solution to meet owner's project requirements through listening, responding and delivering.
The scope of services RJA can provide includes the design of HVAC, plumbing, fire protection, medical gas and temperature controls/automation. We embrace the unique challenges each project provides and strive to design systems that are energy efficient and integrate seamlessly with the building architecture all while being mindful of the client's budget.


Commissioning is a systematic and documented process of verifying that all of a building's systems, including mechanical/HVAC, lighting, electrical, plumbing and specialty systems work as they were intended by the design engineers and as required by the building owner. RJA's commissioning agents have design and mechanical construction background to provide systematic and practical inspections of the installation and operation of these systems, ensuring all of the equipment operates in an integrated manner, improving reliability, maintainability, and overall efficiency.

The commissioning services of RJA are established and offered to meet the growing demand for qualified, knowledgeable commissioning services within the construction industry. Ramirez, Johnson & Associates can provide commissioning services for new and existing buildings, through retro-commissioning and re-commissioning.

Systems and equipment commissioned by our yeam include, large scale VAV air handling systems, industrial condensing water system, split system A/C systems, steam and heating water boiler systems, domestic hot water systems, daylight harvesting lighting systems, occupancy sensor controlled lighting systems and photocell exterior lighting systems. Additionally, we are experienced with fire alarm systems, hospital medical gas systems (bulk and local), nurse call systems, solar thermal and solar photovoltaic renewable energy systems, emergency and back-up power systems, and mission critical cooling systems.

Energy Analysis and Simulation

Energy modeling is a powerful tool that can be used to quantify a building's energy use oand the cost savings associated with various design options. Throughout the design process the simulation is used to help inform and shape the project's design features.
Energy Simulation
Each design alternative's performance may be compared individually or in concert to optimize the building. Additionally, energy modeling is a critical tool for documenting compliance with State and Local energy codes and modern building rating systems (LEED, Green Globes, etc).