Black Diamond's Trusted Heating & Cooling Service Partner Since 1938!

Black Diamond sits at the edge of the Cascade foothills, where coal-town history meets fast-growing communities like Ten Trails and Lake Sawyer. Whether you're in a 1920s miner's cottage downtown or a brand-new build out in The Villages, Glendale Heating & Air Conditioning delivers trusted HVAC service in Black Diamond, WA — keeping homes comfortable through wet Plateau winters and increasingly warm summers since 1938.

Comprehensive Black Diamond HVAC Services

Our family-owned team installs and services furnaces, heat pumps, and air conditioning systems across South King County. In Black Diamond we see everything from older oil and electric furnaces in historic homes to high-efficiency heat pumps in newer subdivisions — and we service them all with the same flat-rate honesty. Many Plateau homeowners qualify for PSE heat pump rebates, and we'll walk you through them at no charge.

Heating & Air Conditioning Repair & Installation in Black Diamond

When something goes wrong with your HVAC system, our Black Diamond technicians arrive ready to diagnose and fix it the same visit whenever possible. Our local repair and installation services include:

• Heat pumps and ductless mini-splits — a great fit for older Black Diamond homes without ductwork
• Gas and electric furnaces — see our furnace repair and furnace replacement pages
• Central air conditioning
• Indoor air quality systems — especially helpful during wildfire smoke season
• ENERGY STAR®-certified high-efficiency upgrades that pay back on PSE bills

Call (206) 243-7700 to schedule Black Diamond HVAC service, or request a free replacement quote online.