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Furnace Replacement and Furnace Installation
Choosing a new furnace can be confusing. Our comfort specialists throughout Phoenix simplify the process by giving you honest recommendations based on your heating needs and budget. When you choose your heating system, we’ll give you a few options, so you can rest assured you’re getting the right furnace for your home.
A local furnace installer who knows Phoenix-area homes matters more than it might seem. Older homes in the Salt River Valley often have ductwork or electrical setups that affect which furnace fits best, and getting the sizing right the first time is what determines whether your new system performs the way it’s supposed to.
A furnace that’s more than 10 to 15 years old, needs frequent repairs, or struggles to keep up with the thermostat setting is often more expensive to keep repairing than to replace. Rising energy bills without a clear cause, uneven heating between rooms, or a system that’s louder than it used to be are also signs worth having checked before you decide between a repair and a full furnace installation.
We also Offer:
- Upfront, honest pricing
- 100% satisfaction guarantee on all of our work
- 4.7 star rating on Google…

On this page:
What’s Included
Your Furnace Replacement or Installation:
Professional Furnace Recommendations
All of our comfort specialists are trained to perform heat load calculations, which tell you what furnace size fits your home. Once our technicians determine the size you need, they’ll provide furnace recommendations based on your budget and heating needs, not a one-size-fits-all pick, whether that means comparing gas and electric options or weighing efficiency against upfront cost.
Upfront Pricing
Before any installation work begins, you’ll get quoted an honest, upfront price. That way, there won’t be any sticker shock when you get the bill.
Flexible Financing Options
Worried that a new gas or electric furnace is going to break your budget? We can help with flexible financing, so you can get the system you need without draining your savings all at once.
100% Satisfaction Guaranteed
If you’re not totally happy with your new furnace, we’ll redo the job on our own dime.
What Happens During Furnace Installation
Once you’ve chosen a furnace, installation typically starts with removing the old unit, if you have one, and preparing the space for the new system. Our technicians connect the furnace to your existing ductwork or make adjustments if needed, handle the gas or electrical connections depending on fuel type, and test the system thoroughly before calling the job done. Most furnace installations in the Phoenix area are completed in a single day, though homes needing ductwork changes or electrical upgrades may take longer.

Factors That Affect Your Furnace Replacement Cost
- Furnace size: The bigger the furnace, the more expensive it will be. Our comfort specialist will help you find the correct furnace size for your home through a heat load calculation, not a guess based on square footage alone.
- Fuel type: Gas furnaces are typically more expensive to install than electric furnaces. However, gas furnaces are cheaper to operate, which means lower monthly energy bills over time.
- Furnace efficiency: The more energy-efficient the furnace, the more expensive it will be upfront. That said, efficient furnaces save you money on your monthly energy bills.
- Extended warranties: Most furnace manufacturers allow you to purchase an extended warranty. The better the warranty, meaning longer terms and more coverage, the more you’ll pay upfront, though it can save you money if a major component fails down the road.
- Advanced features: If you opt for a furnace with modulating heat stages or a variable-speed blower motor, you’ll pay more for your furnace installation.
Frequently Asked Questions
What matters most in a furnace installation?
Sizing and airflow. A furnace matched to the home’s load, connected to ducts that can move its air, runs quieter, cycles properly, and lasts. The equipment brand matters less than the installation quality around it.
Do Phoenix homes need high-efficiency furnaces?
The short heating season changes the math: the highest-efficiency tiers pay back more slowly here than in cold climates. The right answer balances equipment cost against the few months it runs, which is a conversation worth having with quotes in front of you.
Can a new furnace work with my existing AC?
Often, since the furnace blower moves the cooling air too. Compatibility of airflow, coil, and controls gets verified first, because a mismatched pairing undercuts both systems.
What is a two-stage furnace?
One that runs at a lower output most of the time and steps up only when needed. The result is steadier temperatures and quieter operation, which suits mild Valley winters well.
When should a furnace be replaced instead of repaired?
When age, a failing heat exchanger, or repair frequency makes continued investment a poor bet. A cracked heat exchanger in particular is a replacement conversation, since it is the component the rest of the furnace is built around.

How Scheduling Works
Schedule Your Appointment in 3 Steps
1) Book The Appointment
First, contact the friendly and knowledgeable staff members at Patrick Riley | Isley’s! You can call us at (928) 255-1040 or schedule an appointment through our website. We service all of the Phoenix Metro area, including Mesa, Chandler, Gilbert, and the surrounding Salt River Valley areas.
2) Choose a Day and Time
We value your time, and that’s why we offer flexible scheduling options. Once you get in touch with us, our team will work with you to find a day and time that suits your schedule. Whether you prefer a weekday, weekend, morning, or afternoon appointment, we’ll make it happen.
3) Get a Reminder Call
When you book with Patrick Riley | Isleys, you won’t have to worry about when we’ll arrive at your door. We always provide a 30-minute courtesy call so you can have time to square away any pets and get ready for our arrival.



