Total Comfort & Clean Water Solutions for San Diego Homes and Businesses

San Diego’s trusted experts in HVAC/R, plumbing, and water purification, delivering reliable climate control, efficient systems, and crystal-clear water with every service.

HVAC/R & Plumbing in Fallbrook, CA

Serving San Diego & Riverside Counties

Based in Fallbrook, Williams Mechanical Company delivers expert Plumbing and HVAC services across San Diego and Riverside Counties.


We specialize in water heaters, non-salt-based water conditioners, and smart water monitoring systems that promote water conservation and efficiency. Our HVAC services include regular maintenance, residential and commercial variable systems, ductless mini-splits and indoor air quality upgrades, all designed for clean air, energy savings, and long-term comfort.


Trust your local experts for clean water, clean air, and dependable service.

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Experience the Williams Difference

One-Stop Shop

From home plumbing and water rejuvenation to HVAC installation and repair, we're your all-in-one experts.

Plumbing and gear icon.

Innovative Technology

Our commitment to innovation means we use the most advanced technology to ensure increased efficiency, savings, and quality.

Industry-Leading Expertise

Excellence is our core value, reflected in our commitment to quality work and dedication to a seamless customer experience.

We Specalize In HVAC/R, Plumbing, and Water Purification

Learn more about our top services

A man removing the side panel of a heat pump. Outdoor, sunny setting.
Person cleaning an air conditioner fan with a yellow cloth, outdoors.
White wall-mounted air conditioner blowing cool air over a window.
Industrial boilers with orange fronts, silver tanks, and yellow and blue pipes in a utility room.
A person with sunglasses and a cap checks a water pressure gauge on copper pipes outside.
Tankless water heater mounted on a wall with pipes and a blue water filter.
Water filtration system against a wall, including a large tank, filter, and piping.
Two men by a pool: one with hose, one with equipment. Both in black shirts and caps.
Water treatment equipment in a small indoor space; includes tanks, filters, and control panels.
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A Reputation Built on Satisfied

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