Commercial HVAC Installation
Rooftop units, split systems, and packaged systems sized and installed for the building you actually have.
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Licensed mechanical contractor · La Mesa, CA
Mechanical systems that just work
Zimmer Mechanical Company designs, installs, and services the HVAC, piping, and mechanical systems that keep San Diego County buildings running — from a single rooftop unit to a full mechanical room retrofit.
Trusted by facility owners & property teams across San Diego County
Grossmont Healthcare Partners
Sharp Facilities Group
La Mesa-Spring Valley School District
Southwestern Commercial Properties
Cushman Building Group
Pacific Rim Industrial Park
What we do
Full-service mechanical contracting
From design-build installs to emergency repairs, our licensed crew handles commercial mechanical systems across San Diego County. Every project starts with a walkthrough — we quote after we've actually seen the space.
HVAC Repair & Maintenance
Diagnostics, repairs, and scheduled preventive maintenance to keep systems running and catch failures early.
Learn more →Boiler & Chiller Service
Startup, repair, and ongoing service for boilers and chillers in commercial and light-industrial buildings.
Learn more →Commercial & Process Piping
Hydronic, steam, and process piping fabricated and installed to code, with as-built documentation on handoff.
Learn more →Sheet Metal & Ductwork
Custom ductwork fabrication and installation, balanced and sealed for real airflow — not just a passed inspection.
Learn more →Building Automation & Controls
BAS installation and integration so your mechanical systems run efficiently without someone babysitting the thermostat.
Learn more →Job doesn't match the list, or need a quote for something bigger? Talk to us about your project.
How it works
From first call to final commissioning
1
Site visit & assessment
A mechanical engineer or lead technician walks the space to understand the system, the constraints, and the actual problem before anything gets proposed.
2
Scope & written proposal
You get a clear, written proposal covering scope, timeline, and cost — reviewed together before anything is scheduled.
3
Scheduled work
Work is scheduled around your building's operations where possible, with permits pulled for anything that requires one.
4
Commissioning & testing
Systems are tested under load and commissioned to spec before we call a project complete — not just installed and left.
5
Ongoing service
Many clients move to a standing maintenance schedule after the first project, so small issues get caught before they're expensive ones.
7-day workmanship guarantee
If something we installed or repaired isn't performing the way it should within 7 days, call us and we'll return to make it right at no extra charge.
Why us
Zimmer Mechanical vs. a typical HVAC subcontractor
With Zimmer Mechanical
- Licensed mechanical contractor, engineer-reviewed scopes
- Written proposal before any work begins
- Systems commissioned and load-tested, not just installed
- Direct line to the technician on your job
- 7-day workmanship guarantee, in writing
A typical HVAC subcontractor
- Scope decided over the phone, not on-site
- Verbal estimates that shift once work starts
- Commissioning skipped or rushed
- Rotating crews, no single point of contact
- No guarantee once the crew has left
Before you call
Frequently asked questions
We don't publish fixed prices — mechanical scopes vary too much building to building. Every project starts with a site visit, and you get a written proposal with a clear price before anything is scheduled. Request a quote to get started.
Everything from a single rooftop unit repair to a full mechanical room retrofit or new-construction build-out. If you're not sure it's a fit, call us — we'll tell you honestly.
Yes — Zimmer Mechanical Company LLC is a licensed mechanical contractor, fully insured, and every technician on our crew is licensed for the work they perform.
If something we installed or repaired isn't right within 7 days, we return and fix it at no extra charge. Full terms are on our refund policy.
Yes — many clients move to a standing maintenance schedule after their first project. Ask about a maintenance plan when you request a quote.
We're based in La Mesa and serve commercial and light-industrial clients across San Diego County.
Who we are
Mechanical contracting built on written scopes
Zimmer Mechanical Company was founded in La Mesa by David Lizerbram, a mechanical contractor who got tired of scopes that changed after the crew showed up. The company is built around one rule: a written proposal before any work starts, and systems commissioned and tested before we call a job done.
We handle the full range of commercial mechanical work — HVAC, piping, ductwork, and controls — with the same crew from proposal to commissioning, not a rotating cast of subcontractors.
Most of our work comes from property managers, facility engineers, and general contractors across San Diego County who've learned they can hand us a scope and not have to re-check it.
340+
Projects completed
17
Years in San Diego County
94%
Client repeat rate
4.8/5
Average rating
DL
David Lizerbram
Owner & Principal Mechanical Engineer
"I still review every proposal we send out."
RS
Rachel Sung
Operations Manager
"I keep our schedules and our scopes honest."
OH
Omar Haddad
Lead HVAC Technician
"Commissioning is where a job is actually finished."
Client reviews
What San Diego County clients say
★★★★★
"They caught a design issue in our mechanical room before it became a change order. That's the kind of thing you only get from a contractor who actually reads the drawings."
RO
Renee Okafor
Facilities Director, Grossmont Healthcare Partners
★★★★★
"Straightforward proposal, no scope creep, and they commissioned the system properly before signing off."
MD
Mike Delgado
Property Manager, Cushman Building Group
★★★★★
"Our chiller replacement ran exactly on the timeline they gave us. That almost never happens."
SL
Sandra Liu
Plant Engineer, Pacific Rim Industrial Park
★★★★★
"We've used them across three of our locations now. Same crew, same standard, every time."
CN
Chris Novak
Owner, Novak Hospitality Group