Old furnace on borrowed time? Diamond designs, sizes, and installs high-efficiency heating systems the right way - with a free in-home estimate, full combustion safety commissioning, and financing available.
Limited-time summer offers from Diamond - just mention the offer when you call.
A 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 claimReplacing a system that's 10+ years old? Get $750 toward your new one. ($500 trade-in for a working 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 what's going on - we'll walk you through it on a free in-home estimate.
Not sure if it's time? Call 208-231-1635 - we'll talk through repair-vs-replace honestly.
We come to you, measure your home's heat load, review existing gas/venting/electrical, and design the right system for your space.
Clear line items, tier options, manufacturer warranty details, Double Diamond Labor Warranty, financing options. Transparent and simple.
Typically completed in one day. Licensed HVAC technicians, proper gas and venting work, up-to-code install, work area respected.
Full combustion test, CO check, performance verification, thermostat setup, homeowner walkthrough, and paperwork in your hand.
A furnace install that cuts corners on venting, combustion, or gas work isn't just inefficient - it can be dangerous. Here's what separates Diamond.
Sized and designed for your space. No more 'the upstairs is always cold' or bedrooms that never reach the thermostat setting.
High-efficiency furnaces, sized correctly and installed properly, use less gas than old or oversized units. The savings compound every year.
Combustion tested, CO verified, gas pressure confirmed. You get heat that works - and the paperwork to prove it was installed safely.
We quote multiple tier options on every estimate so you can choose the right balance of cost, efficiency, and comfort. Here's the general shape.
Furnace installation pricing depends on your home and existing setup. Here's what drives the quote - and why we never price-guess on the phone.
Furnace size (measured in BTUs) should be matched to your home's actual heat loss, not a rule-of-thumb. Oversized furnaces short-cycle and wear out fast.
An 80% AFUE standard furnace and a 96% AFUE variable-speed furnace are priced very differently. We quote tiers so you can choose.
High-efficiency furnaces need PVC venting (different to old metal flues), sometimes a larger gas line, and correct condensate handling. We upgrade what's needed.
Gas appliance installs require permits in Idaho. We handle the paperwork and make sure the install passes inspection - first time.
Spread the cost over monthly payments. We'll walk you through options on the free estimate.
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.
Properly sized, professionally installed, 1-year labor warranty plus manufacturer parts warranty. Free estimate, no pressure, no obligation. Financing available.
"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.
Free in-home estimate. Full safety commissioning. Financing available. Idaho's Best HVAC Company seven years running.
