Free Duct Cleaning + Thermostat + $1,200 Off ($2,950 value) · Free in-home estimate
(208) 231-1635
Free Duct Cleaning + Free Thermostat + $1,200 Off New System ($2,950 value)

New HVAC System Installation in Boise & the Treasure Valley

Old system on its last legs? Diamond designs, sizes, and installs full heating & cooling systems the right way - proper load calculations, professional install, 2-year money-back guarantee, and financing available.

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 · Typically installed in one day
Diamond licensed HVAC technicians installing a new central air and furnace system 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 system?

Tap what's going on - we'll walk you through it on a free in-home estimate.

Not sure if it's time to replace? 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 HVAC installation works

Five steps. Free estimate. System designed for your home.

Free in-home consultation

We come to you, walk through the home, and ask the right questions - current pain points, energy bills, comfort issues, plans for the home. No pressure.

Proper sizing & system design

Manual J load calculations based on your home's square footage, insulation, windows, ductwork, and orientation. We don't guess - we calculate.

Written quote - your price, fixed

Multiple system tiers, line-item pricing, manufacturer and labour warranty details, financing options. Your quote is your price.

Professional installation

Typically completed in one day for a full system swap. Licensed HVAC technicians, old equipment hauled away, work area left cleaner than we found it.

Tested, calibrated, walked through

Full system test, thermostat setup, performance verification, homeowner walkthrough, and warranty paperwork in hand.

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

An HVAC install priced fairly - and designed to last 15+ years.

HVAC equipment is similarly priced across the industry - the difference is in the system design, the install quality, and what happens when something needs attention later. Here's how Diamond is different.

What cheap installers do
  • Quote a system without doing a load calculation
  • Install whatever's on the truck - sized by guess
  • Skip the small details (proper venting, condensate, sealing ductwork)
  • Sub-contract installs to whoever's cheapest
  • Short labour warranty (1 year or less)
  • Disappear when it's time to service the system
  • High-pressure sales tactics in the home
What Diamond does
  • Manual J load calculations - system sized for YOUR home, not a guess
  • Professional system design - heating + cooling working together properly
  • Proper install - sealed ductwork, code-compliant venting, condensate done right
  • In-house licensed HVAC technicians - no sub-contractors
  • 2-year 100% money-back guarantee on the equipment installation
  • Same team services it forever - we're still here in 10 years
  • No-pressure, free in-home consultation - your quote is your price
Why Treasure Valley chooses Diamond

What you get when we install your system

Consistent comfort, year-round

A properly designed system delivers even temperatures throughout the home - no hot upstairs, cold basement, or arguments over the thermostat.

Lower energy bills, every month

Modern high-efficiency equipment, properly sized and installed, can cut heating & cooling costs by 20-40% versus an aging system.

Fewer repairs, longer lifespan

When the system is sized and installed right, it's not running flat-out trying to keep up. Result: fewer breakdowns, more years out of the equipment.

System options

Three paths, three price points

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

Good

Reliable standard-efficiency system
  • Meets current efficiency standards
  • Reliable, proven equipment from major brands
  • Single-stage cooling, single-stage heating
  • Manufacturer parts warranty
  • Diamond labour warranty + 2-year money-back guarantee
Most chosen

Better

Higher-efficiency, better comfort
  • Higher SEER cooling, higher AFUE heating
  • Two-stage operation - quieter, better humidity control
  • More even temperatures room-to-room
  • Longer manufacturer warranty
  • Diamond labour warranty + 2-year money-back guarantee

Best

Premium variable-speed system
  • Highest-efficiency variable-speed equipment
  • Exceptional comfort, quiet operation, humidity control
  • Smart thermostat included
  • Extended manufacturer warranty
  • Diamond labour warranty + 2-year money-back guarantee
Pricing transparency

Why we quote in your home, not on the phone

HVAC system pricing depends on factors we need to see in person. Here's what drives the price - and why the free in-home estimate is worth the 30 minutes.

1

System size & capacity

Tonnage, BTU output, and zone configuration all depend on a Manual J calculation - your home's square footage, insulation, windows, ductwork, and climate exposure. Wrong sizing wastes thousands over the system's life.

2

Equipment tier

Single-stage vs two-stage vs variable-speed. Higher tiers cost more upfront but deliver better comfort, lower energy bills, and longer lifespan. We show you the math on each tier.

3

Existing ductwork & infrastructure

Is the existing ductwork sized correctly? Sealed properly? Does the electrical panel have capacity? Sometimes the duct or electrical work is the unlock for a high-efficiency system to actually deliver.

4

Warranty & labour coverage

Diamond installs come with a 2-year 100% money-back guarantee on the equipment installation, plus a Diamond labour warranty (typically up to 10 years on the AC equipment, 1 year on the furnace component) and full manufacturer parts warranty. We walk you through the specifics in the written quote.

Financing available to qualified customers

Spread the cost over monthly payments. We'll walk you through options on the free estimate - no hard credit pull to start.

Legitimacy you can verify

Treasure Valley's trusted HVAC system installer since 1999.

Diamond has installed thousands of complete HVAC systems across Boise and the Treasure Valley - central air, furnaces, heat pumps, ductless mini-splits - for new construction, remodels, and full-system retrofits. 1,800+ permitted projects on record.

  • Licensed & fully insured - verify any time
  • Top 1% of Idaho contractors (BuildZoom)
  • 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 Heating, Cooling, Plumbing & Electric licensed HVAC installation team.
Diamond's Service & Install Team Licensed technicians serving the entire Treasure Valley
Free in-home estimate

Get a quote on your new HVAC system

Manual J sizing, Good/Better/Best tier options, 2-year 100% money-back guarantee, 10-year labour warranty on the AC. Free estimate, no pressure, 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 HVAC estimate

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

  • Free in-home consultation & estimate - no pressure, no obligation
  • Multiple tier options on every quote
  • Financing available · 2-year money-back guarantee
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 high-pressure sales. For HVAC system installations we come to your home, run a proper load calculation, walk through your options, and give you a written quote with multiple tier options. If you decide not to go ahead, you owe nothing. If you do, your quote is your price.
How long does the installation take?
Typically completed in one day - around 8-12 hours for a full system swap (AC + furnace replacement). More involved jobs (ductwork modifications, electrical upgrades, switching system type) can take longer - we give you a realistic timeline in the written quote.
Should I repair my old system or replace it?
Honest answer: depends on the age, the cost of the repair, and the efficiency rating of the existing system. A general guide: if your system is over 12 years old, the repair quote is more than half the cost of a new system, and you're seeing rising energy bills, replacement usually wins on total cost-of-ownership over the next 5 years. We'll give you honest numbers on both options at the estimate.
How do I know I'm getting the right size system?
We run a Manual J load calculation - the industry-standard method for sizing HVAC systems. It accounts for your home's square footage, insulation levels, windows, ductwork, and climate. An oversized system short-cycles and wastes energy; an undersized system runs flat-out and wears out fast. Right-sized is the only answer.
What brands do you install?
All major brands - including Rheem, Trane, Carrier, Lennox, and others. We'll recommend the right system for your home based on efficiency, reliability, warranty, parts availability, and your budget. We don't push a single brand; we recommend what's right for your situation.
What warranty do I get?
2-year 100% money-back guarantee on the equipment installation. Plus a Diamond labour warranty (typically up to 10 years on the AC equipment, 1 year on the furnace component) and full manufacturer parts warranty (varies by brand and tier - typically 10 years parts on premium systems). We walk you through the specifics in the written quote.
Do you offer financing?
Yes - financing is available to qualified customers, with no hard credit pull to start the conversation. We'll walk you through the options at the estimate, including monthly payment scenarios for each tier.
Are there energy rebates available?
Often yes - Idaho Power offers rebates on high-efficiency HVAC equipment, and there may be federal tax credits depending on the system tier. We'll walk you through the rebates that apply to the system you're considering as part of the estimate.
What happens to my old system?
We haul it away - included in the install. Old equipment out, new equipment in, work area left cleaner than we found it.

Time for a new HVAC system? Let's design it properly.

Free in-home estimate. Manual J sizing. 2-year money-back guarantee. Financing available.

📞 Call Now · (208) 231-1635