Greenleaf, ID AC Installation Cost — Whole-Home Guide

Installing a whole house AC system is a big investment, and you want a clear, honest answer to one question: how much does it cost to install a whole house AC system? The short answer is that pricing depends on your home, equipment, and any duct or electrical work. The good news is you can control costs with the right plan, fair financing from $120 per month, and a proposal at no cost to you.

Typical Price Ranges in the Boise Area

In the Treasure Valley, most whole house AC installations fall into these ranges:

• Replacement AC only, using existing compatible furnace and ductwork: about $5,500 to $9,500.
• New AC with modest duct updates or line set replacement: about $7,500 to $12,000.
• High efficiency or variable speed systems, added zoning, or extensive ductwork: about $11,000 to $18,000+.

Why the spread? Square footage, insulation levels, equipment type, and install complexity all influence cost. Boise summers often push into the 90s, so sizing and airflow matter if you want comfort without high bills.

“The Ultimate Heating and Air technicians were punctual... installing the new system... finished, cleaned up, and gone in about 5 hours.” –Karin B.

What Drives AC Installation Cost

Several components make up your final investment. Knowing each line item helps you compare proposals apples to apples.

1. Equipment
   • Condenser and coil, or heat pump if you want cooling and efficient heating.
   • Efficiency rating. Higher SEER2 delivers lower monthly bills, but the upfront price is higher.
   • Comfort features like variable speed compressors and smart thermostats raise comfort and control.
2. Labor and Expertise
   • Proper evacuation, charging, brazing, and commissioning take time and skill.
   • Experienced teams finish faster and with fewer callbacks, which protects your warranty.
3. Ductwork and Airflow
   • Leaks, undersized returns, or long runs can choke performance.
   • Minor repairs may be simple. Full redesign adds cost but solves hot and cold spots.
4. Electrical and Line Sets
   • Dedicated circuits, disconnects, surge protection, and new copper line sets may be required.
5. Controls and Zoning
   • Zone control panels, dampers, and thermostats allow room-by-room comfort. Added parts and setup increase cost.
6. Permits and Compliance
   • Most cities in Ada and Canyon counties require mechanical permits for new equipment installations. Proper permitting protects resale value and ensures code compliance.

“Very happy with Ultimate Heating, from the initial appt & quote to the installation & completion schedule.” –Paul S.

Cost by Home Scenario

Every home is different. Here is how costs typically shake out by situation.

1. Straight Swap, Same Size
   • Best case if your ducts and furnace are sized right. Expect a one day install and lower total cost.
2. Upsizing or Downsizing
   • If your existing system was mis-sized, we may adjust capacity. This may require duct changes.
3. Older Homes or Additions
   • Expect more time for duct sealing, new returns, and line set work. This protects comfort and efficiency.
4. Homes Without Ducts
   • Consider ductless mini splits for zoned cooling with high efficiency. Ideal for older Boise bungalows, shops, and bonus rooms.
5. New Construction
   • Full design, load calculations, and coordination with builders. Equipment registration within 90 days enables 10 year equipment warranty terms.

“Did a split level AC install. Awesome all around from start to finish of the project.” –James B.

Central Air vs. Heat Pump vs. Ductless Mini Split

Choosing the right system affects both upfront cost and lifetime savings.

• Central Air Conditioner
  • Pairs with a gas furnace. Lower upfront than heat pumps in many cases. Efficient summer cooling.
• Heat Pump System
  • Cools in summer and heats efficiently in spring and fall. May reduce gas use. Slightly higher upfront, potential annual savings.
• Ductless Mini Split
  • Perfect for homes without ductwork or for problem rooms. Zoned comfort, excellent efficiency, quick installs.

We will walk you through options, costs, and the pros and cons for your home, not a one size fits all answer.

How to Avoid Surprise Fees

Transparent proposals protect your budget. Look for these items listed clearly:

• Exact equipment model numbers and SEER2 ratings
• Scope of ductwork or line set replacement
• Electrical upgrades or surge protection
• Permits and inspections included
• Thermostat and zoning hardware
• Warranty terms, registration requirements, and labor coverage

Our proposals are itemized and direct. No service call fees and no dispatch fees on many of our offers. You will know the cost before we start.

Financing and Monthly Payment Examples

Many Boise homeowners prefer payments for predictable budgeting.

• A/C install as low as $120 per month for qualified buyers
• Options structured to fit your timeline and priorities
• Proposal at no cost to you before you decide

Financing turns a larger purchase into a manageable investment and preserves your cash for other projects.

What a Quality Install Includes

A low price should never mean shortcuts. Here is what a thorough, code compliant install looks like.

1. In-home assessment
   • Load calculations, airflow checks, and duct inspection.
2. Removal and preparation
   • Safe recovery of refrigerant, clean removal of old equipment, and site protection.
3. Set and connect equipment
   • Proper line set routing and brazing, nitrogen purge, evacuation to industry standard vacuum levels, accurate refrigerant charge.
4. Electrical and controls
   • New disconnect if needed, tight electrical terminations, and thermostat setup.
5. Airflow verification
   • Static pressure reading, supply and return balancing, and thermostat calibration.
6. Commissioning
   • Performance verification and homeowner walk-through.

This is how we deliver comfort on day one and protect your warranty for the long term.

Warranties and Membership Value

Two hard facts to ground your decision:

• 10 year equipment warranty is available when your system is registered within 90 days. We handle the paperwork with you.
• Our Lion Shield maintenance membership includes an annual 21 point cooling system maintenance and safety inspection, priority service, same day stock parts replacement, 15 percent repair discounts, and a 2 year labor and parts warranty. Membership is free.

These benefits keep your system efficient, reduce surprise repairs, and protect your investment.

When Zoning Makes Sense in the Treasure Valley

Multi level homes in Meridian, Eagle, and Boise often have hot upstairs rooms. A zone control system adds dampers and a control panel so each level gets the right airflow. Expect added parts and labor, but the payoff is balanced comfort and lower runtime. Ductless mini splits are another smart option for bonus rooms, shops, and garages.

Signals You May Need Duct or Electrical Work

Addressing these items during install prevents callbacks and high bills later.

• Rooms that never reach setpoint in summer
• Whistling returns or visible kinks in flex duct
• Burned or undersized disconnects near the condenser
• Frequent breaker trips when the AC starts
• Rusted line set covers or oil stains near connections

If we find issues, we will show you photos, explain options, and give a clear cost before work starts.

Why Homeowners Choose Ultimate Heating & Air

• Local experience. Over 20 years serving the Boise area.
• Recognized quality. Bryant Circle of Champions, Medal of Excellence, and Dealer of the Year honors.
• Licensed and insured team with an in-house apprenticeship program.
• Same day service options and 24/7 on call support when it matters most.
• No service call fees and clear, itemized proposals at no cost to you.

You will get education without pressure, options without confusion, and a crew that treats your home with care.

Special Offer

A/C install as low as $120 per month with a proposal at no cost to you. Offer valid through 2026-06-03. Call (208) 738-4822 and mention the A/C Install + Proposal offer when you schedule. Some conditions may apply.

What Homeowners Are Saying

"Did a split level AC install. Awesome all around from start to finish of the project. I ask a lot of question and they took the time to answer all of them promptly, from the estimator to the tech doing the install. Look no further, these guys are the best."
–James B., AC Installation

"The Ultimate Heating and Air technicians were punctual. They were very efficient in removing our old gas furnace and air conditioner and installing the new system... They were finished, cleaned up, and gone in about 5 hours."
–Karin B., Boise

"Very happy with Ultimate Heating, from the initial appt & quote to the installation & completion schedule. Heartily recommend them."
–Paul S., Meridian

Frequently Asked Questions

How much does a whole house AC replacement cost in Boise?

Most replacements range from about $5,500 to $12,000 depending on size, efficiency, and any duct or electrical work. High efficiency or zoning can push totals above $12,000. A proposal at no cost to you will confirm the exact scope and price for your home.

Is a heat pump worth it compared to an AC?

Often yes. A heat pump provides cooling plus efficient heating in spring and fall, which can lower annual energy costs. Upfront cost may be slightly higher than AC only, but comfort and savings improve for many Treasure Valley homes.

Do I need new ductwork for a replacement?

Not always. If your ducts are sealed and sized properly, you may only need minor adjustments. Undersized returns, leaks, or long runs can require upgrades. We test airflow and static pressure so you only pay for what improves comfort.

What warranties should I expect?

Look for a 10 year equipment warranty with on time registration. Ask about labor coverage and membership benefits. Our Lion Shield membership adds priority service, discounts, and a 2 year labor and parts warranty on covered items.

How long does installation take?

Most standard replacements take one day. Complex duct changes, zoning, or electrical upgrades can extend the timeline. Our crews coordinate parts in advance to keep your project on schedule and your home protected.

In Summary

The cost to install a whole house AC system depends on your home, equipment, and any duct or electrical work. In Boise and nearby cities, most projects land between about $5,500 and $12,000, with premium options higher. Ready for clear numbers and expert guidance?

Call, Schedule, or Chat Today

Get your proposal at no cost to you and financing options as low as $120 per month. Call (208) 738-4822 or visit https://ultimateheatingandair.com/. Mention the A/C Install + Proposal offer, valid through 2026-06-03. We are here for you today, next year, and beyond.

Service Areas

Proudly serving Boise, Meridian, Nampa, Caldwell, Eagle, Kuna, Star, Garden City, Middleton, and Greenleaf.

About Ultimate Heating & Air, Inc.

For over 20 years, we have served Boise, Meridian, Nampa, and beyond with licensed and insured technicians. Our in-house apprenticeship program builds deep expertise, and our team has earned manufacturer recognition including Bryant Circle of Champions and Dealer of the Year. We stand behind our work with a 10-year equipment warranty when registered within 90 days, membership benefits, and clear, upfront pricing. Service at a higher level.