Furnace not heating, making strange noises, or blowing cold? Diamond's licensed technicians diagnose and repair every major brand - same-day in most cases, with a full combustion and CO safety check on every repair.
Limited-time summer offers from Diamond - just mention the offer when you call.
Replacing a system that's 10+ years old? Get $750 toward your new one. ($500 trade-in for a working system.)
Call to claimA full heating & cooling system swap, properly designed and installed - now $1,000 off.
Call to claimAn $895 value - a full decade of labor coverage included when Diamond installs your new system.
Call to claimOffers valid June–August 2026. Cannot be combined with other offers. Some restrictions apply; ask for full details when you call. Financing subject to credit approval.
Tap your situation - we'll connect you to an HVAC technician on our line.
Smell gas? Turn off your furnace and call 208-231-1635 immediately.
Tell us what your furnace is doing - no heat, won't start, making noises. We send an HVAC technician trained across all major brands.
On-site inspection, combustion and CO safety test, and a real diagnosis - not a sales pitch for a new unit.
Repair completed, system tested under load, and a final safety check before we leave. You get heat back - and confidence it's safe.
Furnace repair is the one service where cutting corners can cost lives. A skipped combustion check misses a cracked heat exchanger, which vents CO into your home. Here's how Diamond is different.
Fully-stocked trucks and experienced HVAC technicians mean most furnace repairs are one-visit, not a return trip in a week.
A cracked heat exchanger can vent carbon monoxide into your home without warning. Every furnace we service gets a full combustion safety check.
If your furnace is at end of life, we'll say so - with numbers. If it's a $250 fix on a 10-year-old unit, we'll say that too. Your call, not a sales pitch.
Diamond was built by Rick and Sue Ellen in 1999 to do home services the way homeowners actually deserve - properly trained technicians, your-quote-is-your-price honesty, and one accountable team for every trade.
Idaho's Best HVAC Company seven years running (2020–2026), Idaho's Best Contractor 2022, and the BBB Torch Award for Ethics in 2014 and 2022.
We answer live, 24/7 - and dispatch same-day in most cases. Walking you through what's wrong starts on the phone.
"We were impressed with their up-front and clear pricing. John was on time, and explained everything necessary to do with no pressure to do it."
"Diamond Heating and Cooling was very knowledgeable and professional from start to finish. Highly recommended."
"Without a doubt, Diamond Heating and Cooling is the best possible choice you can make when deciding on a company you can rely on to provide excellent service."
Diamond is based in Garden City and serves homeowners across the Treasure Valley & surrounding areas.
Not sure if you're in our area? Call 208-231-1635 - we'll confirm on the line.
Tap the phone to talk live now. Real licensed technicians, your-quote-is-your-price honesty, no answering service.
Same-day furnace service in most cases. Full combustion and CO safety check. Idaho's Best HVAC Company seven years running.
