Free Duct Cleaning + $900 Off New AC ($1,800 value) · Free in-home estimate
(208) 231-1635
Free Duct Cleaning + $900 Off New AC ($1,800 value)

New AC Installation in Boise & the Treasure Valley

Old AC on its last summer? Diamond designs, sizes, and installs high-efficiency cooling systems the right way - with a free in-home estimate, 2-year 100% money-back guarantee, 10-year labour warranty, and financing to spread the cost.

BBB Integrity Torch · Idaho's Best HVAC 2020-2022 · Top 1% Idaho Contractor

4.9 · 5,000+ reviews Licensed & Insured Since 1999
Free in-home estimate · 2-year money-back guarantee · 10-year labour warranty
Diamond HVAC technician installing a new residential air conditioning condenser in a Treasure Valley home.
Free In-Home Estimate
4.9 / 5 across 5,000+ reviews Treasure Valley's most-reviewed home services team

What's prompting a new AC?

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.

4.9 · 5,000+ Google reviews Treasure Valley's top-rated
Idaho's Best HVAC 2020-2022 Three years running
Licensed & Insured Top 1% of Idaho contractors
Serving Treasure Valley Since 1999
How AC installation works

Four steps. Free estimate. Proper design.

Free in-home estimate

We come to you, measure your home, review your existing setup, and design the right system for your space. No pressure, no obligation.

Written quote - your price, fixed

Clear line items, manufacturer warranty details, 10-year Diamond labour warranty, financing options. Multiple tier options if you want them.

Professional installation

Typically completed in one day. Licensed HVAC technicians, proper refrigerant handling, cleaner-than-we-found-it site standards.

Tested, tuned, walked through

Full performance test under load, thermostat setup, homeowner walkthrough (filters, maintenance, warranty registration), paperwork in hand.

24/7 emergency line answered live · Real licensed technicians, not an answering service
What makes Diamond different

An AC install that performs - and keeps performing.

A new AC is expensive. The wrong one, installed wrong, is ruinously expensive. Here's what separates Diamond from cheaper operators who cut corners you can't see.

What cheap AC installers do
  • Install whatever size is on the truck - 'close enough' sizing
  • Skip the heat load calculation - no design work
  • Reuse old refrigerant lines (often undersized or contaminated)
  • Sub-contract install to cheapest crew
  • Short labour warranty (1 year or less)
  • No proper commissioning - 'it's blowing cold, we're done'
What Diamond does
  • Proper heat load calculation - sized for your specific home
  • System designed around your space, not what's in stock
  • New refrigerant lines where needed, vacuum-tested, correctly charged
  • In-house licensed HVAC technicians - no sub-contractors
  • 10-year labour warranty + manufacturer parts warranty
  • Full commissioning - static pressure, charge, airflow, all verified
Why Treasure Valley chooses Diamond

What you get when we install your AC

Cool, comfortable home - every room

Sized and designed for your space. No more 'the upstairs never cools' or 'the bedroom is always 6° warmer than the living room'.

Lower energy bills, year after year

High-efficiency systems, properly sized, correctly installed. The savings vs. an old or oversized system are real - and they compound every summer.

10-year labour warranty

Ten years. We're that confident in the install. Parts covered by the manufacturer, labour covered by us. Peace of mind built in.

System options

Three paths, three price points

We quote multiple tier options on every estimate so you can pick the right balance of cost, efficiency, and performance. Here's the general shape.

Good

Efficient standard-tier
  • Meets or exceeds current efficiency standards
  • Reliable, proven equipment from major brands
  • Manufacturer parts warranty
  • 10-year Diamond labour warranty
Most chosen

Better

Higher-efficiency, better comfort
  • Higher SEER rating - lower operating cost
  • Quieter operation, better humidity control
  • Two-stage cooling for more even temperatures
  • Longer manufacturer warranty terms
  • 10-year Diamond labour warranty

Best

Premium variable-speed
  • Highest-efficiency variable-speed systems
  • Exceptional comfort, quiet, and humidity control
  • Extended manufacturer warranty
  • Smart thermostat included
  • 10-year Diamond labour warranty
Pricing transparency

Why we quote in your home, not on the phone

Central AC installation pricing depends on your home and your existing setup. Here's what drives the quote - and why we never price-guess on the phone.

1

Home size & heat load

A 1,500 sqft ranch needs a very different system than a 3,500 sqft two-storey. Getting the size right saves thousands over the life of the system.

2

Efficiency tier you choose

A standard-efficiency system and a high-efficiency variable-speed system are priced very differently. We quote tiers so you can choose.

3

Your existing setup

Ductwork condition, electrical service, condenser pad, refrigerant line set - the state of what's already there affects the install scope.

4

Permits & code upgrades

Idaho code changes over the years. Older installs sometimes need electrical or venting upgrades to be compliant. We handle the permits.

Financing available to qualified customers

Spread the cost over monthly payments. We'll walk you through options on the free estimate.

Legitimacy you can verify

Idaho's Best HVAC Company - three years running.

Diamond has designed and installed AC systems for thousands of Treasure Valley homes since 1999. Idaho's Best HVAC Company 2020, 2021, 2022 - and 1,800+ permitted projects on record.

  • Licensed & fully insured - verify any time
  • Top 1% of Idaho contractors
  • 1,800+ permitted projects on record
  • BBB Integrity Torch Award recipient
  • Idaho's Best HVAC Company 2020, 2021, 2022
  • Idaho's Best Contractor 2022
Diamond HVAC installation team - Idaho's Best HVAC Company 2020, 2021, 2022.
Diamond's Service & Install Team Licensed technicians serving the entire Treasure Valley
Free in-home estimate

Get a quote on your new AC

Proper heat load calculation, multiple tier options, written quote. Free estimate, no pressure, no obligation. Financing available.

Meet the Diamond team

The family-built company behind 5,000+ five-star reviews

Diamond isn't a private-equity rollup. It's a 26-year Treasure Valley business - built by Rick and Sue Ellen, around a single idea: do home services the way homeowners deserve.

Rick, Sue Ellen, and the Diamond Heating, Cooling, Plumbing & Electric management team in Boise, Idaho.
Rick & Sue Ellen with the Diamond leadership team

Rick opened Diamond's doors in March 1999, focused on new construction. He earned a reputation across the Treasure Valley for solving the hot-bonus-room problem nobody else could fix - and for treating customers fairly when others didn't.

In 2009, Rick's wife and business partner Sue Ellen joined full-time. Together they made the call to pivot from new construction to residential service - because they saw an industry that, too often, didn't take care of its customers. They wanted Diamond to stand for the opposite.

"We wanted clients to experience excellence and be 100% satisfied with the service they receive. We call it the Diamond Difference." - Rick & Sue Ellen, Founders

That standard is what built the company you see today - the awards, the reviews, the 1,800+ permitted projects on record. None of it happened by accident.

1999
Rick founds Diamond Heating & Cooling, focused on residential new construction.
2009
Sue Ellen joins full-time. Diamond pivots to residential service - and to the standard that defines it today.
2014
Awarded the BBB Integrity Torch Award - recognising honest, ethical business practice.
2020 - 2022
Named Idaho's Best HVAC Company three years running, plus Idaho's Best Contractor 2022.
Real customers · Real reviews

What Treasure Valley homeowners say

4.9 / 5 · 5,000+ Google reviews · Treasure Valley's most-reviewed home services team
Honest pricing - no upsell

"Up-front and clear pricing"

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.

- Ed Boise, ID
Professional - start to finish

"Knowledgeable and professional"

Diamond Heating and Cooling was very knowledgeable and professional from start to finish. Highly recommended.

- Cliff Boise, ID
Reliable - excellent service

"The best possible choice"

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.

- Caleb G. Boise, ID
Service area

Serving the entire Treasure Valley

Diamond is based in Garden City and serves homeowners across the Treasure Valley & surrounding areas.

BoiseGarden City (HQ)MeridianEagleNampaCaldwellKunaMiddletonStar

Not sure if you're in our area? Call (208) 231-1635 - we'll confirm on the line.

Book your free estimate

Book your free AC estimate

Tap the phone to talk live now. Real licensed technicians, your-quote-is-your-price honesty, no answering service.

  • Free in-home estimate - no pressure, no obligation
  • Multiple system tier options on every quote
  • 10-year labour warranty · Financing available
Questions, answered

Before you call - the things people want to know

Is the estimate really free?
Yes - no call-out fee, no diagnostic fee, no pressure. For AC system replacements we come to your home, measure and assess, design the right system, and give you a written quote with multiple tier options. If you don't move forward, you owe nothing.
How long does installation take?
Typically completed in one day for a standard residential install. Bigger projects (new ductwork, electrical upgrades) can take two days. We give you a realistic timeline in the written quote.
What size AC do I need?
It depends on your home's heat load - which is a function of square footage, insulation, windows, orientation, and a dozen other factors. We do a proper heat load calculation as part of every estimate. Oversized systems are a common mistake that causes humidity issues and higher bills - we size correctly the first time.
What brands do you install?
We install all major residential AC brands. We'll recommend the right system for your home based on reliability, warranty, local parts availability, and efficiency.
What warranty do I get?
2-year 100% money-back guarantee on the equipment installation. Plus a 10-year Diamond labour warranty on the install itself, plus the full manufacturer warranty on all parts (which varies by brand and tier - typically 10 years on the compressor, 10 years on parts, with registration). We walk you through specifics in the written quote.
Do you offer financing?
Yes - financing is available to qualified customers. Spread the cost over monthly payments. We'll walk you through the options at the estimate, including monthly payment scenarios.
Will you haul the old system away?
Yes - included in every install. Old equipment removed, refrigerant handled in line with EPA requirements, work area left clean. Zero disposal effort on your side.

New AC? Let's design it properly.

Free in-home estimate. 10-year labour warranty. Financing available. Idaho's Best HVAC Company three years running.

📞 Call Now · (208) 231-1635