Precision you can trust.
Local heating and air conditioning service for Merced and the Central Valley — honest diagnostics, quality workmanship, and a team that treats your home like their own.
CSLB #1151243 · Licensed & Insured · Merced & the Central Valley
Everything we do.
A/C Installation
New high-efficiency cooling, sized and sealed right.
A/C Repair
Fast, honest diagnosis to get you cool again.
Ductless Mini-Split
Efficient, zoned comfort — no ductwork required.
Indoor Air Quality
Cleaner, healthier air for the whole home.
Duct Repair & Replacement
Sealed, efficient ductwork — our oldest specialty.
Dryer Vent Cleaning
Clear the lint that slows dryers and could be a potential fire hazard.
Commercial HVAC
Dependable systems that keep business running.
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Services
Browse Flagship install
High-efficiency systems, installed to spec.
Right-sized load calculations, sealed ductwork and premium equipment from every major brand — dialed in for lower bills and quiet, even comfort in every room.
Repair
Repairs done right the first time.
When something isn't working, our certified technicians show up, diagnose the real problem before quoting, and fix it right — no guesswork, no upsells.
Schedule a Diagnostic — $79Why Diamond
The standard is set higher — and held there.
The Diamond Promise
Here's what you can count on.
- 01We diagnose before we recommend.
- 02We explain before you spend.
- 03We don't sell repairs you don't need.
- 04We respect your home, your time and your money.
- 05We stand behind our work.
We service most major HVAC brands
Diamond Plan
Maintenance made simple.
Two precision tune-ups a year, priority scheduling, and members-only pricing that keep your system running efficiently — and head off the breakdowns before they happen.
Diamond Plan · Annual
Includes spring & fall inspections, priority scheduling, and members-only repair pricing.
Ask about the Diamond PlanSee the work for yourself.
Project gallery coming soon.
Proudly serving the Central Valley.
Local trucks, local techs, and a Valley we know by heart — here are the communities we cover, plus the surrounding areas.
- Merced, CA
- Atwater, CA
- Winton, CA
- Livingston, CA
- Planada, CA
- Le Grand, CA
- El Nido, CA
- Snelling, CA
- Catheys Valley, CA
- Dos Palos Y, CA
- Delhi, CA
- Denair, CA
- Turlock, CA
Comfort worth talking about.
What homeowners across Merced, Atwater, and the surrounding communities have to say.
“Excellent service! This is the former Holl Heat and Air Co. that I have users for past 5 years. Diana is amazing! Ken is the best tech. I will always trust and rely on Diamond Co. for all my heat and AC services. Highly recommend!”
Why we're called Diamond.
A diamond is precision under pressure — cut to exacting standards, built to last, prized for getting every detail right. That's the standard we bring to comfort across the Central Valley.
Doing it right the first time isn't complicated — it just takes care. Our certified technicians diagnose before they quote, using real testing instead of guesswork, so you get the actual problem and an honest price, never an upsell. We show up on time, respect your home, and stand behind every install, repair, and tune-up. We know Central Valley homes and Central Valley summers, and we treat your comfort like our name is on it — because it is.
That's the Diamond promise: precise work, honest pricing, and comfort you can count on, season after season.
Get in touch
Schedule your service.
Tell us what's going on and we'll get a certified technician scheduled — fast. Same-day appointments available across the Central Valley.
- Call us
- (209) 722-7463
- Hours
- By appointment
- Service area
- Merced · Atwater · Central Valley