You knew us as Holl.

For more than thirty years, Holl Sheet Metal kept the Central Valley comfortable. The name on the truck changed to Diamond — the standard didn't, and neither did the crew that built it.

We came up in sheet metal, fabricating the ductwork most companies only ever hook up to. That's still how we think about a system: get the air right and everything downstream gets easier. It's why we diagnose before we quote — pressure gauges, digital meters, and the patience to find the root cause, whether it's a refrigerant leak or an electrical fault, instead of swapping a part and hoping. You'll hear from us at every step. And when a system really is finished, we pull the old unit safely and install a high-efficiency replacement that earns its keep on your power bill.

Heat, pressure, and thirty years — that's how you make a diamond. Turns out it's also how you make a crew worth calling.