Diamond Heating and Cooling Logo
(208) 378-6624

HVAC Repair in the Greater Boise Area

Need HVAC repair now? We fix furnaces, heat pumps, and AC systems with honest diagnostics and clear options. Since 1999, our family-owned team has focused on service, not sales, with certified technicians and upfront pricing. Serving the Greater Boise Area, including Boise, Meridian, and Nampa. Backed by a 4.9 rating from 5,898 reviews and BBB Integrity Torch honors. Call to schedule or request a free second opinion on major repairs.

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We also give you a written satisfaction guarantee that your system will be fixed right or it is free!

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August 5, 202627 days leftView offer
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Free Second Opinion on All Major HVAC Repairs

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20% off repairs

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Why us

Why Choose Us

Certified technicians

Factory trained with ongoing education

Service, not sales

No commissions; honest diagnostics since 1999

Award-winning ethics

BBB Integrity Torch and Idaho's Best honors

Upfront, clear pricing

Free second opinions on major HVAC repairs

Local and responsive

24/7 emergency service across the Treasure Valley

Social proof

What Our Customers Say

5.0
speed

“Responsive after-hours team repaired our AC quickly and got our home cool again.”

5.0
professionalism

“Explained the work and cost up front, then fixed our air conditioning.”

5.0
quality

“Arrived on time, diagnosed the furnace, and fixed it. Top notch.”

Got questions?

Frequently Asked Questions

An air conditioner not turning on with the thermostat set to Cool usually means the system isn’t receiving the start signal or a safety device is holding it off. Most problems come from lost power, control setting errors, or a condensate overflow switch that stops cooling to prevent leaks. If the indoor blower runs but the outdoor unit is silent, a failed capacitor or contactor is a top suspect. In our Treasure Valley calls, we often find a tripped float switch after pollen or dust clogs the drain.

Check these quick items before scheduling service:

  • Confirm the thermostat is on Cool with a setpoint below room temp; replace its batteries.
  • Reset any tripped AC breaker and make sure the indoor unit’s service switch is on.
  • Ensure the outdoor disconnect is fully seated and any nearby GFCI isn’t tripped.
  • Replace a heavily clogged filter and clear a backed-up condensate drain; thaw ice before retrying.

If these steps don’t restore cooling, stop cycling power and book a professional diagnosis to prevent component damage.

Updated: 2026-06-18

Need help in Middleton, ID? Call (208) 378-6624 or book online.

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Where we work

Where We Work

Boise

ID

Nampa

ID

Caldwell

ID

Meridian

ID

Eagle

ID

Emmett

ID

Garden City

ID

Horseshoe Bend

ID

Kuna

ID

Middleton

ID

Star

ID

Ready when you are

Schedule service today

(208) 378-6624