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.
Repair, maintain, install.
Residential and light commercial work across the Valley. Every visit starts with a real diagnosis — testing, not guessing.
The standard is set higher — and held there.
Five commitments.
Written down because they hold whether or not anyone is watching.
- 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.
The numbers, up front.
No trip-charge games and no surprise line items. This is what a visit costs before we ever pick up a tool.
| Diagnostic visit | A technician tests the system and explains the fault. Applied to the repair if you approve it. | $79 |
|---|---|---|
| Standard maintenance | Full seasonal tune-up: coils, refrigerant charge, electrical, airflow, safeties. | $89 |
| Install estimates | On-site load calculation and written proposal. No obligation. | Free |
| License & insurance | CSLB #1151243. Workers' comp and liability carried on every job. | Included |
Licensed & insured · CSLB #1151243 · Prices current for Merced County service calls
Maintained, not repaired.
Two tune-ups a year, priority scheduling, and member pricing that keep your system running efficiently — and head off the breakdowns before they happen.
Two zones or a second unit, covered on the same schedule.
Join the Diamond Plan →Jobs we've finished.
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.
Schedule your service.
Tell us what's going on and we'll get a licensed technician scheduled. Same-day appointments are often available across Merced, Atwater, and the Central Valley.
- Call us
- (209) 722-7463
- Hours
- By appointment
- Service area
- Merced · Atwater · Central Valley
Call or text · Mon–Sat
CSLB #1151243 · Licensed & Insured · Merced, CA